{"title":"Serial-to-USB Converters","description":"\u003cp\u003eKeep legacy RS232 serial equipment working with modern computers that have dropped serial ports entirely. Available in single-port and multi-port configurations, these USB adapters are a plug-and-play way to maintain compatibility with older instrumentation, POS systems, and industrial controllers.\u003c\/p\u003e","products":[{"product_id":"usb-to-rs-232-serial-male-adapter-converter-multi-1-usb-rs232","title":"SystemBase Multi-1\/USB RS232 1-Port USB to RS-232 Serial Adapter | Industrial-Grade Surge Protection","description":"\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003eNeed One Reliable Serial Port? This Is the One That Won't Let You Down.\u003c\/h3\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003eEvery day, technicians, engineers, and IT professionals reach for a USB-to-serial adapter — to configure a router, upload a program to a CNC machine, pull data from a lab instrument, or connect a receipt printer. Most grab a cheap $10 adapter. Then the problems start: dropped connections, missing handshaking signals, no surge protection, and drivers that stop working after a Windows update.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cspan class=\"font-semibold\"\u003eThe SystemBase Multi-1\/USB RS232 is the adapter you buy when you're done wasting time.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eOne rock-solid RS-232 serial port through a standard DB9 connector, industrial-grade ±15kV surge protection, full handshaking signal support, and speeds up to 921.6 Kbps — all from a compact, USB bus-powered device that just works.\u003c\/p\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e🔧 Real-World Applications the Multi-1\/USB RS232 Solves\u003c\/h3\u003e\n\u003cul class=\"ml-4 list-outside list-disc\"\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eIT \u0026amp; Network Administration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Access the serial console on routers, switches, firewalls, and UPS systems for configuration, firmware updates, and emergency troubleshooting. The single most common use for a USB-to-serial adapter — and the one where reliability matters most.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eCNC \u0026amp; Machine Tool Programming\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Connect a laptop directly to a CNC mill, lathe, or router for DNC file transfers and program uploads. Compact enough to toss in your tool bag and take to the shop floor.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003ePoint-of-Sale \u0026amp; Retail\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Link a receipt printer, barcode scanner, cash drawer, or customer display to a USB-only POS terminal. One port, one device, zero complications.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eLaboratory \u0026amp; Medical Instruments\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Collect data from analytical balances, spectrometers, pH meters, and environmental sensors that output via RS-232. Full handshaking support ensures compatibility with instruments that require hardware flow control.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eIndustrial Automation\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Interface with PLCs, variable frequency drives, temperature controllers, and HMI panels for programming and diagnostics from a modern laptop.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eField Service \u0026amp; Maintenance\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— The go-to adapter for service technicians who need to connect to serial equipment on-site. USB bus-powered, pocket-sized, and protected against the voltage spikes you encounter in the field.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eHobbyist \u0026amp; Maker Projects\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Connect Arduino, Raspberry Pi, and other microcontroller projects that use serial UART communication to your development PC. Reliable enough for prototyping, robust enough for permanent installations.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eLegacy Equipment Integration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Keep older serial-only devices — modems, time clocks, access panels, GPS receivers — connected and productive without replacing perfectly functional hardware.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e💡 Why Professionals Choose the Multi-1\/USB RS232 Over Cheap Alternatives\u003c\/h3\u003e\n\u003cdiv class=\"my-4 w-full overflow-x-auto\"\u003e\n\u003ctable class=\"min-w-full table-auto border-collapse border-spacing-0\"\u003e\n\u003cthead class=\"border-b border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eBenefit\u003c\/th\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eWhat It Means for You\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003e±15kV Surge Protection\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eBuilt-in industrial-grade surge suppression shields your equipment and PC from voltage spikes. Cheap adapters have zero protection — one static discharge and you're replacing both the adapter and potentially your USB port. This one is built for real-world environments.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003e921.6 Kbps Communication Speed\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eFar beyond the standard 115.2 Kbps ceiling of most USB-to-serial adapters. Handles high-speed DNC transfers, rapid data acquisition, and demanding throughput without bottlenecks.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eFull RS-232 Signal Support\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eAll standard RS-232 handshaking signals (TxD, RxD, RTS, CTS, DTR, DSR, DCD, RI, GND) are supported. Many cheap adapters only provide TxD and RxD — then fail silently when your device requires hardware flow control. This one supports every signal on the spec.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eLatching USB Connector\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eThe USB cable locks into place, preventing accidental disconnection. No more mystery disconnects during a critical firmware upload or data transfer.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eTX\/RX LED Indicators\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eInstantly verify data is flowing — invaluable for troubleshooting connections and confirming communication before you start a job.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eUSB Bus-Powered\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eNo external power supply needed. The adapter draws power directly from your USB port, keeping your setup clean and completely portable.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eCompact, Pocket-Sized Design\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eSmall enough to keep in your laptop bag, tool kit, or desk drawer. Always ready when you need it. No expansion cards, no bulky enclosures.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eReliable Driver Support\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eSupports most Windows and Linux operating systems with stable, proven drivers — not the generic drivers that cause blue screens and COM port conflicts.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e📦 What's in the Box\u003c\/h3\u003e\n\u003cul class=\"ml-4 list-outside list-disc\"\u003e\n\u003cli class=\"py-0.5\"\u003eMulti-1\/USB RS232 adapter unit with 1× DB9 male serial port\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003eUSB cable with latching connector\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003eUser manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e⚙️ Technical Specifications\u003c\/h3\u003e\n\u003cdiv class=\"my-4 w-full overflow-x-auto\"\u003e\n\u003ctable class=\"min-w-full table-auto border-collapse border-spacing-0\"\u003e\n\u003cthead class=\"border-b border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eSpecification\u003c\/th\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eSerial Interface\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eRS-232\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eNumber of Ports\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e1\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eConnector Type\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eDB9 Male\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eUSB Standard\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eUSB 2.0 (Full Speed)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eMax Baud Rate\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e921.6 Kbps\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eSurge Protection\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e±15kV (ESD)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eRS-232 Signals\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eTxD, RxD, RTS, CTS, DTR, DSR, DCD, RI, GND\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eLED Indicators\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eTX\/RX\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eUSB Connection\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eLatching connector (prevents accidental disconnect)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003ePower\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eUSB bus-powered (no external adapter required)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eOS Support\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eWindows \u0026amp; Linux\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eManufacturer\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eSystemBase (South Korea)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e🛡️ Buy with Confidence\u003c\/h3\u003e\n\u003cul class=\"ml-4 list-outside list-disc\"\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eAuthorized US Distributor\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Envistia Mall is an authorized SystemBase distributor. You're getting genuine product with full manufacturer support.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eShips from the USA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Fast domestic shipping, no international customs delays.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eTechnical Support\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Need help with installation, driver setup, or wiring? Our support team is here to help.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: How is this different from the cheap USB-to-serial adapters?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Three critical differences: (1)\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"font-semibold\"\u003e±15kV surge protection\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e— cheap adapters have none, leaving your PC's USB port vulnerable to damage. (2)\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"font-semibold\"\u003eFull RS-232 handshaking signals\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e— budget adapters often only support TxD\/RxD and fail with devices that require RTS\/CTS or DTR\/DSR flow control. (3)\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"font-semibold\"\u003e921.6 Kbps speed\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e— most cheap adapters max out at 115.2 Kbps. The Multi-1\/USB RS232 is built for professional use where reliability isn't optional.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Will this work with my laptop?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Absolutely. Any PC, laptop, or industrial computer with an available USB port can use this adapter. It's USB bus-powered — nothing else to plug in. Toss it in your bag and you're ready for any field service call.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Do I need to install drivers?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Yes, a simple driver installation is required. Drivers are included on CD and are also available for download. The adapter supports most Windows and Linux operating systems.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Does this support hardware flow control (RTS\/CTS)?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Yes. The Multi-1\/USB RS232 supports all standard RS-232 handshaking signals including RTS, CTS, DTR, DSR, DCD, and RI — ensuring compatibility with devices that require hardware flow control. This is one of the most common reasons cheap adapters fail — and one of the biggest reasons to choose this one.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Is there an RS-422\/RS-485 version?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Yes! The SystemBase Multi-1\/USB COMBO provides one RS-422\/RS-485 port for longer-distance, multi-drop industrial networks. Check our full SystemBase product line for the right fit.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: I need more than one serial port. What are my options?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: SystemBase offers 2-port and 4-port USB-to-serial adapters in both RS-232 and RS-422\/485 configurations. If you need multiple serial connections, the Multi-2\/USB RS232 or Multi-4\/USB RS232 will save you USB ports and desk space compared to using multiple single-port adapters.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: How does the surge protection work?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: The adapter includes built-in ±15kV surge suppression on the serial lines, protecting both the adapter and your connected PC from electrostatic discharge and voltage transients. This is especially important in industrial environments, server rooms, and field service scenarios where static buildup and electrical noise are common.\u003c\/p\u003e\n\u003ch3\u003eAdditional Resources\u003c\/h3\u003e\n\u003cp\u003e\u003ca title=\"Multi-1\/USB RS232 USB to RS-232 DB9 Serial Adapter\/Converter\" href=\"https:\/\/www.sysbas.com\/en\/portfolio-item\/multi-1usb-rs232\/\" target=\"_blank\"\u003eMulti-1\/USB RS232 USB to RS-232 DB9 Serial Adapter\/Converter Manual, Utilities and Specifications Downloads (SystemBase Website)\u003c\/a\u003e\u003c\/p\u003e","brand":"SystemBase","offers":[{"title":"Default Title","offer_id":42081551155449,"sku":"Multi-1-USB-RS232","price":43.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1641\/0911\/products\/usb-to-rs-232-db9-serial-adapterconverter-multi-1usb-rs232-336867.jpg?v=1637738940"},{"product_id":"usb-to-rs-422-rs-485-db9-serial-adapter-converter-multi-1-usb-combo","title":"SystemBase Multi-1\/USB COMBO 1-Port USB to RS-422\/485 Serial Adapter | Industrial-Grade Surge Protection","description":"\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003eNeed One RS-422\/485 Connection? Get the Adapter That's Built for the Real World.\u003c\/h3\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003eYou've got a single RS-422 or RS-485 device — a PLC, a sensor array, an access control panel, an energy meter — and you need to connect it to a modern PC that has zero serial ports. You could grab a cheap adapter and hope for the best. Or you could use the one that industrial professionals trust.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cspan class=\"font-semibold\"\u003eThe SystemBase Multi-1\/USB COMBO delivers one rock-solid RS-422\/RS-485 serial port through a standard DB9 connector, powered entirely from your USB port.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eSwitchable between RS-422 and RS-485 mode, protected by ±15kV surge suppression, and capable of speeds up to 921.6 Kbps — this compact adapter is engineered for environments where \"close enough\" isn't good enough.\u003c\/p\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e🔧 Real-World Applications the Multi-1\/USB COMBO Solves\u003c\/h3\u003e\n\u003cul class=\"ml-4 list-outside list-disc\"\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eIndustrial Automation \u0026amp; PLC Programming\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Connect a laptop directly to a PLC, motor controller, or HMI panel over RS-485 for programming, diagnostics, and firmware updates. Compact enough to carry in your tool bag for on-site service calls.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eRS-485 Multi-Drop Sensor Networks\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Manage up to 32 devices on a single RS-485 bus — temperature sensors, flow meters, pressure transducers, and environmental monitors — all from one USB port on your PC.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eBuilding Management \u0026amp; HVAC\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Interface with a BACnet MS\/TP controller, lighting system, or energy meter that communicates over RS-485. Ideal for commissioning, diagnostics, and system configuration from a service laptop.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eEnergy \u0026amp; Utility Metering\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Poll a smart meter, power analyzer, or substation relay over RS-485 for data collection, configuration, and compliance reporting.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eSecurity \u0026amp; Access Control\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Connect to a card reader controller, door panel, or alarm system that uses RS-485 for centralized management and programming.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eTelecommunications \u0026amp; Network Equipment\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Configure legacy telecom gear, modems, and network infrastructure devices that use RS-422\/RS-485 serial interfaces.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eWater\/Wastewater \u0026amp; Process Control\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Monitor and control a pump, valve, chemical dosing system, or level sensor over RS-485 from a field laptop during site visits.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eTest \u0026amp; Development Labs\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Prototype and test RS-422\/RS-485 communication for embedded systems, IoT devices, and industrial product development.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e💡 Why Professionals Choose the Multi-1\/USB COMBO Over Cheap Alternatives\u003c\/h3\u003e\n\u003cdiv class=\"my-4 w-full overflow-x-auto\"\u003e\n\u003ctable class=\"min-w-full table-auto border-collapse border-spacing-0\"\u003e\n\u003cthead class=\"border-b border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eBenefit\u003c\/th\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eWhat It Means for You\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eSwitchable RS-422 \/ RS-485\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eOne adapter, two protocols. Select RS-422 (full-duplex, point-to-point) or RS-485 (half-duplex, multi-drop) to match your device — maximum flexibility without buying separate adapters.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003e±15kV Surge Protection\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eBuilt-in industrial-grade surge suppression shields your equipment and PC from voltage spikes. Cheap adapters have zero protection — one transient on an RS-485 bus and you're replacing both the adapter and potentially your laptop's USB port. This one is built for the real world.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003e921.6 Kbps Communication Speed\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eBlazing-fast serial throughput handles high-speed data acquisition and real-time control applications without bottlenecks — far beyond the limits of budget adapters.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eAuto Toggling (Bus I\/O Control)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eAutomatic transmit\/receive direction switching for RS-485 eliminates the need for manual RTS\/CTS flow control coding. Just plug in and communicate — no custom driver code, no wasted development time.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eSlew-Rate Limiting\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eReduces electromagnetic interference (EMI) for cleaner signals in electrically noisy environments like factory floors, substations, and equipment rooms.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eLatching USB Connector\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eThe USB cable locks into place, preventing accidental disconnection in vibration-prone environments. No more mystery disconnects during a critical PLC upload or data transfer.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eTX\/RX LED Indicators\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eInstantly verify data is flowing — invaluable for troubleshooting RS-485 bus connections and confirming communication before you start a job.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eUSB Bus-Powered\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eNo external power supply needed. The adapter draws power directly from your USB port, keeping your setup clean and completely portable for field service.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eCompact, Pocket-Sized Design\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eSmall enough to keep in your laptop bag, tool kit, or desk drawer. Always ready when you need it. No expansion cards, no bulky enclosures.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e📦 What's in the Box\u003c\/h3\u003e\n\u003cul class=\"ml-4 list-outside list-disc\"\u003e\n\u003cli class=\"py-0.5\"\u003eMulti-1\/USB COMBO adapter unit with 1× DB9 male serial port\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003eUSB cable with latching connector\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003eUser manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e⚙️ Technical Specifications\u003c\/h3\u003e\n\u003cdiv class=\"my-4 w-full overflow-x-auto\"\u003e\n\u003ctable class=\"min-w-full table-auto border-collapse border-spacing-0\"\u003e\n\u003cthead class=\"border-b border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eSpecification\u003c\/th\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eSerial Interface\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eRS-422 \/ RS-485 (selectable)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eNumber of Ports\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e1\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eConnector Type\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eDB9 Male\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eUSB Standard\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eUSB 2.0 (Full Speed)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eMax Baud Rate\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e921.6 Kbps\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eSurge Protection\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e±15kV (ESD)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eBus Control\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eAuto Toggling (automatic RS-485 direction control)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eSignal Control\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eSlew-rate limiting for reduced EMI\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eLED Indicators\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eTX\/RX\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eUSB Connection\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eLatching connector (prevents accidental disconnect)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003ePower\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eUSB bus-powered (no external adapter required)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eOS Support\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eWindows \u0026amp; Linux\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eManufacturer\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eSystemBase (South Korea)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e🛡️ Buy with Confidence\u003c\/h3\u003e\n\u003cul class=\"ml-4 list-outside list-disc\"\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cspan class=\"font-semibold\"\u003eAuthorized US Distributor\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e— Envistia Mall is an authorized SystemBase distributor. You're getting genuine product with full manufacturer support.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cspan class=\"font-semibold\"\u003eShips from the USA\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e— Fast domestic shipping, no international customs delays.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cspan class=\"font-semibold\"\u003eTechnical Support\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e— Need help with installation, driver setup, or wiring? Our support team is here to help.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Can I switch between RS-422 and RS-485 mode?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Yes! The adapter is selectable between RS-422 (full-duplex, point-to-point) and RS-485 (half-duplex, multi-drop) mode, giving you maximum flexibility from a single device. Choose the protocol that matches your connected equipment.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: How many devices can I connect on RS-485?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: In RS-485 multi-drop mode, you can connect up to 32 devices on a single bus. This makes the Multi-1\/USB COMBO ideal for sensor arrays, distributed I\/O, and metering systems where multiple devices share one communication line.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: How is this different from the cheap USB-to-RS-485 adapters?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Three critical differences: (1)\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"font-semibold\"\u003e±15kV surge protection\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e— cheap adapters have none, leaving your PC vulnerable to damage from voltage transients common on RS-485 buses. (2)\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"font-semibold\"\u003eAuto Toggling\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e— automatic RS-485 direction control means no custom code for transmit\/receive switching. (3)\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"font-semibold\"\u003e921.6 Kbps speed\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eand\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"font-semibold\"\u003eslew-rate limiting\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003efor clean, fast communication in noisy industrial environments. The Multi-1\/USB COMBO is built for professional use where reliability isn't optional.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: What does \"Auto Toggling\" mean?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: In RS-485 half-duplex mode, the adapter automatically switches between transmit and receive — you don't need to write custom code to control the data direction. This simplifies integration and reduces development time significantly.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Will this work with my laptop?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Absolutely. Any PC, laptop, or industrial computer with an available USB port can use this adapter. It's USB bus-powered — nothing else to plug in. Toss it in your bag and you're ready for any field service call.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Do I need to install drivers?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Yes, a simple driver installation is required. Drivers are included on CD and are also available for download. The adapter supports most Windows and Linux operating systems.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: How is this different from the Multi-1\/USB RS232?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: The COMBO model provides RS-422\/RS-485 connectivity, which is used for longer-distance communication (up to 1,200 meters for RS-485) and multi-drop networks where multiple devices share one bus. The RS232 model provides standard RS-232 for point-to-point connections to devices like printers, scanners, and console ports. Choose the COMBO if your device uses RS-422 or RS-485 protocol.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: I need more than one RS-422\/485 port. What are my options?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: SystemBase offers 2-port and 4-port USB-to-RS-422\/485 adapters with the same industrial-grade features. The Multi-2\/USB COMBO and Multi-4\/USB COMBO will give you additional channels without consuming extra USB ports. Check our full SystemBase product line for the right fit.\u003c\/p\u003e\n\u003ch3\u003eAdditional Resources\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.sysbas.com\/en\/portfolio-item\/multi-1usb-combo\/\" title=\"Multi-1\/USB COMBO USB to RS-422 \/ RS-485 DB9 Serial Adapter\/Converter\" target=\"_blank\"\u003eMulti-1\/USB COMBO USB to RS-422 \/ RS-485 DB9 Serial Adapter\/Converter Manual, Utilities and Specifications Downloads (SystemBase Website)\u003c\/a\u003e\u003c\/p\u003e","brand":"SystemBase","offers":[{"title":"Default Title","offer_id":42081590444281,"sku":"Multi-1-USB-COMBO","price":74.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1641\/0911\/products\/usb-to-rs-422rs-485-db9-serial-adapterconverter-multi-1usb-combo-744991.jpg?v=1637738940"},{"product_id":"usb-to-rs-232-2-port-db9-serial-adapter-converter-multi-2-usb-rs232","title":"SystemBase Multi-2\/USB RS232 2-Port USB to RS-232 Serial Adapter | Industrial-Grade Surge Protection","description":"\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003eYour Serial Devices Aren't Going Anywhere. Your PC's Serial Ports Already Did.\u003c\/h3\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003eFrom CNC machines and receipt printers to lab instruments and network consoles, RS-232 serial devices are still the backbone of countless businesses. But today's PCs and laptops ship with zero serial ports — leaving you stranded without a reliable way to connect.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cspan class=\"font-semibold\"\u003eThe SystemBase Multi-2\/USB RS232 fixes that in under a minute.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003ePlug it into any USB port and instantly gain two full RS-232 serial connections through standard DB9 connectors — no opening the case, no expansion cards, no driver nightmares. Just plug in and start communicating.\u003c\/p\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e🔧 Real-World Applications the Multi-2\/USB RS232 Adapter Solves\u003c\/h3\u003e\n\u003cul class=\"ml-4 list-outside list-disc\"\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eCNC \u0026amp; Machine Tool Programming\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Connect directly to CNC mills, lathes, and routers that rely on RS-232 for program uploads, DNC file transfers, and real-time machine monitoring from a modern laptop.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003ePoint-of-Sale \u0026amp; Retail\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Link receipt printers, cash drawers, barcode scanners, and customer displays that still use RS-232 serial to your USB-only POS terminal.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eLaboratory \u0026amp; Medical Instruments\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Collect data from analytical balances, spectrometers, blood analyzers, and environmental sensors that output via RS-232.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eIT \u0026amp; Network Administration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Access the serial console on routers, switches, firewalls, and UPS systems for configuration, firmware updates, and troubleshooting.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eIndustrial Automation \u0026amp; Process Control\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Interface with PLCs, variable frequency drives, temperature controllers, and HMI panels that communicate over RS-232 serial.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eBuilding Management \u0026amp; HVAC\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Connect to legacy BMS controllers, thermostats, and energy management systems that use RS-232 for programming and diagnostics.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eShipping \u0026amp; Logistics\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Interface with industrial scales, label printers, and dimensioning systems in warehouses and fulfillment centers.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eHobbyist \u0026amp; Maker Projects\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Connect Arduino, Raspberry Pi, and other microcontroller projects that use serial UART communication to your development PC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e💡 Why Professionals Choose the Multi-2\/USB RS232\u003c\/h3\u003e\n\u003cdiv class=\"my-4 w-full overflow-x-auto\"\u003e\n\u003ctable class=\"min-w-full table-auto border-collapse border-spacing-0\"\u003e\n\u003cthead class=\"border-b border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eBenefit\u003c\/th\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eWhat It Means for You\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003e±15kV Surge Protection\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eBuilt-in industrial-grade surge suppression shields your equipment and PC from voltage spikes — no blown ports, no costly repairs. Essential for factory floors, server rooms, and field service work.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003e921.6 Kbps Communication Speed\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eFar beyond the standard 115.2 Kbps ceiling of most USB-to-serial adapters. Handles high-speed data transfers, rapid DNC file uploads, and demanding data acquisition without bottlenecks.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eTwo Independent RS-232 Ports\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eRun two serial devices simultaneously from a single USB connection — connect a CNC machine and a barcode scanner, or a scale and a label printer, all at once.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eFull RS-232 Signal Support\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eAll standard RS-232 handshaking signals (TxD, RxD, RTS, CTS, DTR, DSR, DCD, RI, GND) are supported, ensuring compatibility with devices that require hardware flow control. Many cheap adapters skip these — this one doesn't.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eLatching USB Connector\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eThe USB cable locks into place, preventing accidental disconnection in vibration-prone environments. No more mystery disconnects on the shop floor or in the server rack.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eTX\/RX LED Indicators\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eInstantly verify data is flowing on each port — invaluable for troubleshooting connections and commissioning new equipment.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eUSB Bus-Powered\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eNo external power supply needed. The adapter draws power directly from your USB port, keeping your workspace clean and your setup completely portable.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eCompact, External Design\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eNo need to open your PC or install expansion cards. Works with desktops, laptops, and industrial PCs — take it wherever the job is.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e📦 What's in the Box\u003c\/h3\u003e\n\u003cul class=\"ml-4 list-outside list-disc\"\u003e\n\u003cli class=\"py-0.5\"\u003eMulti-2\/USB RS232 adapter unit with 2× DB9 male serial ports\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003eUSB cable with latching connector\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003eUser manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e⚙️ Technical Specifications\u003c\/h3\u003e\n\u003cdiv class=\"my-4 w-full overflow-x-auto\"\u003e\n\u003ctable class=\"min-w-full table-auto border-collapse border-spacing-0\"\u003e\n\u003cthead class=\"border-b border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eSpecification\u003c\/th\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eSerial Interface\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eRS-232\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eNumber of Ports\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e2\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eConnector Type\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eDB9 Male\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eUSB Standard\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eUSB 2.0 (Full Speed)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eMax Baud Rate\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e921.6 Kbps\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eSurge Protection\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e±15kV (ESD)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eRS-232 Signals\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eTxD, RxD, RTS, CTS, DTR, DSR, DCD, RI, GND\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eLED Indicators\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eTX\/RX per port\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eUSB Connection\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eLatching connector (prevents accidental disconnect)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003ePower\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eUSB bus-powered (no external adapter required)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eOS Support\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eWindows \u0026amp; Linux\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eManufacturer\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eSystemBase (South Korea)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e🛡️ Buy with Confidence\u003c\/h3\u003e\n\u003cul class=\"ml-4 list-outside list-disc\"\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eAuthorized US Distributor\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Envistia Mall is an authorized SystemBase distributor. You're getting genuine product with full manufacturer support.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eShips from the USA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Fast domestic shipping, no international customs delays.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eTechnical Support\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Need help with installation, driver setup, or wiring? Our support team is here to help.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Will this work with my laptop?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Absolutely. Any PC, laptop, or industrial computer with an available USB port can use this adapter — no internal expansion slots needed. It's USB bus-powered, so there's nothing else to plug in.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Can I use both ports at the same time?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Yes. Each port operates as an independent COM port. You can run two different serial devices simultaneously at full speed.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Do I need to install drivers?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Yes, a simple driver installation is required. Drivers are included on CD and are also available for download. The adapter supports most Windows and Linux operating systems.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Does this support hardware flow control (RTS\/CTS)?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Yes. The Multi-2\/USB RS232 supports all standard RS-232 handshaking signals including RTS, CTS, DTR, DSR, DCD, and RI — ensuring compatibility with devices that require hardware flow control.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: How is this different from the Multi-2\/USB COMBO?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: The RS232 model provides two dedicated RS-232 ports, which is the most common serial standard for point-to-point device connections (printers, scanners, instruments, console ports). The COMBO model provides RS-422\/RS-485 ports instead, which are used for longer-distance, multi-drop industrial networks. Choose the RS232 if your devices have standard DB9 serial ports and use RS-232 protocol.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: How does the surge protection work?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: The adapter includes built-in ±15kV surge suppression on the serial lines, protecting both the adapter and your connected PC from electrostatic discharge and voltage transients common in industrial and commercial settings.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: I need more than 2 serial ports. Do you have larger options?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Yes! SystemBase offers 4-port and 8-port USB-to-serial adapters in both RS-232 and RS-422\/485 configurations. Check our full SystemBase product line for the right fit.\u003c\/p\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3\u003e📄 Documentation \u0026amp; Resources\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.sysbas.com\/en\/portfolio-item\/multi-2usb-rs232\/\" title=\"Multi-2\/USB RS232 USB to RS-232 2-Port DB9 Serial Adapter\/Converter\" target=\"_blank\"\u003eMulti-2\/USB RS232 USB to RS-232 2-Port DB9 Serial Adapter\/Converter Manual, Utilities and Specifications Downloads (SystemBase Website)\u003c\/a\u003e\u003c\/p\u003e","brand":"SystemBase","offers":[{"title":"Default Title","offer_id":42081599881465,"sku":"Multi-2-USB-RS232","price":85.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1641\/0911\/products\/usb-to-rs-232-2-port-db9-serial-adapterconverter-multi-2usb-rs232-765711.jpg?v=1637738940"},{"product_id":"usb-to-rs-422-485-2-port-db9-serial-adapter-converter-multi-2-usb-combo","title":"SystemBase Multi-2\/USB COMBO 2-Port USB to RS-422\/485 Serial Adapter |  Industrial-Grade Surge Protection","description":"\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003eStill Running Legacy Serial Equipment? Connect It to Any Modern PC in Seconds.\u003c\/h3\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003eFactories, warehouses, labs, and control rooms rely on RS-422 and RS-485 serial devices every day — PLCs, sensors, barcode scanners, access control panels, HVAC controllers, and industrial scales that were built to last decades. The problem? Modern PCs and laptops no longer come with serial ports.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cspan class=\"font-semibold\"\u003eThe SystemBase Multi-2\/USB COMBO bridges that gap instantly.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003ePlug it into any USB port and you get two rock-solid RS-422\/RS-485 serial connections through standard DB9 connectors — no internal cards, no driver headaches, no downtime.\u003c\/p\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e🔧 Real-World Applications The Multi-2\/USB COMBO Adapter Solves\u003c\/h3\u003e\n\u003cul class=\"ml-4 list-outside list-disc\"\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eIndustrial Automation \u0026amp; Manufacturing\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Connect PLCs, motor controllers, and HMI panels to a modern PC for programming, monitoring, or SCADA integration over RS-485 multi-drop networks.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eBuilding Management \u0026amp; HVAC\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Interface with BACnet MS\/TP controllers, lighting systems, and energy meters that communicate over RS-485.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003ePoint-of-Sale \u0026amp; Retail\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Link barcode scanners, receipt printers, and cash drawers that still use serial connections to USB-only terminals.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eLaboratory \u0026amp; Scientific Instruments\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Collect data from analytical instruments, scales, and environmental sensors with reliable RS-422\/485 communication.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eSecurity \u0026amp; Access Control\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Integrate card readers, door controllers, and alarm panels into centralized management software.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eTelecommunications \u0026amp; Networking\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Configure and manage legacy network equipment, modems, and telecom infrastructure via serial console.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eMulti-Drop RS-485 Networks\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Manage up to 32 devices on a single RS-485 bus per port — ideal for sensor arrays, distributed I\/O, and metering systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e💡 Why Choose the Multi-2\/USB COMBO\u003c\/h3\u003e\n\u003cdiv class=\"my-4 w-full overflow-x-auto\"\u003e\n\u003ctable class=\"min-w-full table-auto border-collapse border-spacing-0\"\u003e\n\u003cthead class=\"border-b border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eBenefit\u003c\/th\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eWhat It Means for You\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003e±15kV Surge Protection\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eBuilt-in industrial-grade surge suppression protects your equipment and your PC from voltage spikes — no blown ports, no costly repairs. Critical for factory floors and outdoor installations.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003e921.6 Kbps Communication Speed\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eBlazing-fast serial throughput handles high-speed data acquisition and real-time control applications without bottlenecks.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eSwitchable RS-422 \/ RS-485 Per Port\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eOne adapter, two protocols. Select RS-422 (full-duplex, point-to-point) or RS-485 (half-duplex, multi-drop) independently on each port — maximum flexibility from a single device.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eAuto Toggling (Bus I\/O Control)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eAutomatic transmit\/receive direction switching for RS-485 eliminates the need for manual RTS\/CTS flow control coding — just plug in and communicate.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eLatching USB Connector\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eThe USB cable locks into place, preventing accidental disconnection in vibration-prone industrial environments. No more mystery disconnects on the shop floor.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eTX\/RX LED Indicators\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eInstantly verify that data is flowing on each port — invaluable for troubleshooting and commissioning.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eSlew-Rate Limiting\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eReduces electromagnetic interference (EMI) for cleaner signals in electrically noisy environments like manufacturing plants and data centers.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eCompact, External Design\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eNo need to open your PC or install expansion cards. Works with desktops, laptops, and industrial PCs — take it wherever the job is.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e📦 What's in the Box\u003c\/h3\u003e\n\u003cul class=\"ml-4 list-outside list-disc\"\u003e\n\u003cli class=\"py-0.5\"\u003eMulti-2\/USB COMBO adapter unit with 2× DB9 male serial ports\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003eUSB cable with latching connector\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003eUser manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e⚙️ Technical Specifications\u003c\/h3\u003e\n\u003cdiv class=\"my-4 w-full overflow-x-auto\"\u003e\n\u003ctable class=\"min-w-full table-auto border-collapse border-spacing-0\"\u003e\n\u003cthead class=\"border-b border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eSpecification\u003c\/th\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eSerial Interface\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eRS-422 \/ RS-485 (selectable per port)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eNumber of Ports\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e2\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eConnector Type\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eDB9 Male\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eUSB Standard\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eUSB 2.0 (Full Speed)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eMax Baud Rate\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e921.6 Kbps\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eSurge Protection\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e±15kV (ESD)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eBus Control\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eAuto Toggling (automatic RS-485 direction control)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eSignal Control\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eSlew-rate limiting for reduced EMI\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eLED Indicators\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eTX\/RX per port\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eUSB Connection\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eLatching connector (prevents accidental disconnect)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eOS Support\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eWindows \u0026amp; Linux\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eManufacturer\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eSystemBase (South Korea)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e🛡️ Buy with Confidence\u003c\/h3\u003e\n\u003cul class=\"ml-4 list-outside list-disc\"\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eAuthorized US Distributor\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— \u003cem\u003eEnvistia Mall\u003c\/em\u003e is an authorized SystemBase distributor. You're getting genuine product with full manufacturer support.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eShips from the USA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Fast domestic shipping, no international customs delays.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eTechnical Support\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Need help with installation, driver setup, or wiring? Our support team is here to help.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Can I use one port as RS-422 and the other as RS-485 at the same time?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Yes! Each port can be independently configured for either RS-422 or RS-485 mode, giving you maximum flexibility in mixed-protocol environments.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Do I need to install drivers?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Yes, a simple driver installation is required. Drivers are included on CD and are also available for download. The adapter supports most Windows and Linux operating systems.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Will this work with my laptop?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Absolutely. Any PC, laptop, or industrial computer with an available USB port can use this adapter — no internal expansion slots needed.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: What does \"Auto Toggling\" mean?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: In RS-485 half-duplex mode, the adapter automatically switches between transmit and receive — you don't need to write custom code to control the data direction. This simplifies integration and reduces development time.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: How does the surge protection work?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: The adapter includes built-in ±15kV surge suppression on the serial lines, protecting both the adapter and your connected PC from electrostatic discharge and voltage transients common in industrial settings.\u003c\/p\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3\u003e📄 Documentation \u0026amp; Resources\u003c\/h3\u003e\n\u003cp\u003e\u003ca title=\"Multi-2\/USB COMBO USB to RS-422\/RS-485 2-Port DB9 Serial Adapter\/Converter\" href=\"https:\/\/www.sysbas.com\/en\/portfolio-item\/multi-2usb-combo\/\" target=\"_blank\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/www.sysbas.com\/en\/portfolio-item\/multi-2usb-combo\/\" title=\"Multi-2\/USB Combo Drivers, User Manual, and Utilities Downloads (SystemBase Website)\" rel=\"noopener\" target=\"_blank\"\u003eMulti-2\/USB Combo Drivers, User Manual, and Utilities Downloads (SystemBase Website)\u003c\/a\u003e\u003c\/p\u003e","brand":"SystemBase","offers":[{"title":"Default Title","offer_id":43142793265401,"sku":"Multi-2-USB-COMBO","price":104.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1641\/0911\/products\/usb-to-rs-422485-2-port-db9-serial-adapterconverter-systembase-multi-2usb-combo-414860.jpg?v=1660970443"},{"product_id":"usb-to-rs-232-4-port-db9-serial-adapter-converter-multi-4-usb-rs232","title":"SystemBase Multi-4\/USB RS232 — 4-Port USB to RS-232 Serial Adapter | Industrial-Grade Surge Protection","description":"\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003eFour Serial Devices. One USB Port. No Compromises.\u003c\/h3\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003eWhen your workflow depends on multiple RS-232 serial devices — CNC machines, receipt printers, lab instruments, network consoles — a single-port adapter just doesn't cut it. And juggling multiple 2-port adapters means more USB ports consumed, more cables tangled, and more points of failure.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cspan class=\"font-semibold\"\u003eThe SystemBase Multi-4\/USB RS232 solves it cleanly.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003ePlug one USB cable into any PC or laptop and instantly gain four independent RS-232 serial ports through standard DB9 connectors. Four COM ports, one connection, zero hassle. No opening the case, no expansion cards — just plug in and get to work.\u003c\/p\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e🔧 Real-World Applications the Multi-4\/USB RS232 Solves\u003c\/h3\u003e\n\u003cul class=\"ml-4 list-outside list-disc\"\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eCNC \u0026amp; Machine Shop Operations\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Connect four CNC mills, lathes, or routers simultaneously for DNC file transfers, program uploads, and real-time machine monitoring — all from a single laptop on the shop floor.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003ePoint-of-Sale \u0026amp; Retail\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Run a complete POS station from one USB port: receipt printer, barcode scanner, cash drawer, and customer display — all four serial devices connected at once.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eLaboratory \u0026amp; Medical Instruments\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Collect data from multiple analytical balances, spectrometers, blood analyzers, or environmental sensors simultaneously, feeding everything into your LIMS or analysis software in real time.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eIT \u0026amp; Network Administration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Access serial consoles on four routers, switches, firewalls, or UPS systems at once — ideal for rack-level configuration, firmware updates, and emergency troubleshooting without swapping cables.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eIndustrial Automation \u0026amp; Process Control\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Interface with multiple PLCs, variable frequency drives, temperature controllers, and HMI panels from a single engineering workstation.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eShipping \u0026amp; Logistics\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Connect industrial scales, label printers, dimensioning systems, and barcode scanners in a warehouse packing station — one adapter handles the entire workflow.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eBuilding Management \u0026amp; HVAC\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Program and diagnose multiple BMS controllers, thermostats, and energy management systems from a single service laptop during site visits.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eEducation \u0026amp; Training Labs\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Equip lab workstations with four serial ports for students working with microcontrollers, embedded systems, and serial communication projects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e💡 Why Professionals Choose the Multi-4\/USB RS232\u003c\/h3\u003e\n\u003cdiv class=\"my-4 w-full overflow-x-auto\"\u003e\n\u003ctable class=\"min-w-full table-auto border-collapse border-spacing-0\"\u003e\n\u003cthead class=\"border-b border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eBenefit\u003c\/th\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eWhat It Means for You\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003e4 Independent RS-232 Ports\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eRun four serial devices simultaneously from a single USB connection. No more daisy-chaining multiple adapters, fighting for USB ports, or swapping cables between devices.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003e±15kV Surge Protection\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eBuilt-in industrial-grade surge suppression on every port shields your equipment and PC from voltage spikes — no blown ports, no costly repairs. Essential for factory floors, server rooms, and field service work.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003e921.6 Kbps Communication Speed\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eFar beyond the standard 115.2 Kbps ceiling of most USB-to-serial adapters. Handles high-speed DNC transfers, rapid data acquisition, and demanding throughput — even with all four ports active simultaneously.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eFull RS-232 Signal Support\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eAll standard RS-232 handshaking signals (TxD, RxD, RTS, CTS, DTR, DSR, DCD, RI, GND) are supported on every port. Many cheap adapters skip these — this one doesn't. Full hardware flow control ensures compatibility with demanding legacy devices.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eLatching USB Connector\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eThe USB cable locks into place, preventing accidental disconnection in vibration-prone environments. No more mystery disconnects on the shop floor, in the server rack, or during critical data transfers.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eTX\/RX LED Indicators\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eInstantly verify data is flowing on each of the four ports — invaluable for troubleshooting connections and commissioning multi-device installations.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eUSB Bus-Powered\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eNo external power supply needed. The adapter draws power directly from your USB port, keeping your workspace clean and your setup completely portable for field service.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eCompact, External Design\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eNo need to open your PC or install expansion cards. Works with desktops, laptops, and industrial PCs — take it wherever the job is.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e📦 What's in the Box\u003c\/h3\u003e\n\u003cul class=\"ml-4 list-outside list-disc\"\u003e\n\u003cli class=\"py-0.5\"\u003eMulti-4\/USB RS232 adapter unit with 4× DB9 male serial ports\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003eUSB cable with latching connector\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003eUser manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e⚙️ Technical Specifications\u003c\/h3\u003e\n\u003cdiv class=\"my-4 w-full overflow-x-auto\"\u003e\n\u003ctable class=\"min-w-full table-auto border-collapse border-spacing-0\"\u003e\n\u003cthead class=\"border-b border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eSpecification\u003c\/th\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eSerial Interface\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eRS-232\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eNumber of Ports\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e4\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eConnector Type\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eDB9 Male\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eUSB Standard\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eUSB 2.0 (Full Speed)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eMax Baud Rate\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e921.6 Kbps\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eSurge Protection\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e±15kV (ESD)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eRS-232 Signals\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eTxD, RxD, RTS, CTS, DTR, DSR, DCD, RI, GND\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eLED Indicators\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eTX\/RX per port\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eUSB Connection\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eLatching connector (prevents accidental disconnect)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003ePower\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eUSB bus-powered (no external adapter required)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eOS Support\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eWindows \u0026amp; Linux\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eManufacturer\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eSystemBase (South Korea)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e🛡️ Buy with Confidence\u003c\/h3\u003e\n\u003cul class=\"ml-4 list-outside list-disc\"\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eAuthorized US Distributor\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Envistia Mall is an authorized SystemBase distributor. You're getting genuine product with full manufacturer support.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eShips from the USA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Fast domestic shipping, no international customs delays.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eTechnical Support\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Need help with installation, driver setup, or wiring? Our support team is here to help.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Can I use all four ports at the same time?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Yes. Each port operates as an independent COM port with its own dedicated channel. You can run four different serial devices simultaneously at full speed without any performance degradation.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Will this work with my laptop?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Absolutely. Any PC, laptop, or industrial computer with an available USB port can use this adapter — no internal expansion slots needed. It's USB bus-powered, so there's nothing else to plug in. Perfect for field technicians and service engineers.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Do I need to install drivers?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Yes, a simple driver installation is required. Drivers are included on CD and are also available for download. The adapter supports most Windows and Linux operating systems.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Does this support hardware flow control (RTS\/CTS)?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Yes. The Multi-4\/USB RS232 supports all standard RS-232 handshaking signals including RTS, CTS, DTR, DSR, DCD, and RI on every port — ensuring compatibility with devices that require hardware flow control.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: How is this different from the 2-port Multi-2\/USB RS232?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Same industrial-grade quality, same features — doubled capacity. The Multi-4\/USB RS232 gives you four RS-232 ports instead of two, making it the right choice when you need to manage more serial devices from a single workstation. If two ports are enough, the Multi-2\/USB RS232 is a more compact and cost-effective option.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: How is this different from the Multi-4\/USB COMBO?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: The RS232 model provides four dedicated RS-232 ports, which is the most common serial standard for point-to-point device connections (printers, scanners, instruments, console ports). The COMBO model provides RS-422\/RS-485 ports instead, which are used for longer-distance, multi-drop industrial networks. Choose the RS232 if your devices have standard DB9 serial ports and use RS-232 protocol.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: How does the surge protection work?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: The adapter includes built-in ±15kV surge suppression on all serial lines across all four ports, protecting both the adapter and your connected PC from electrostatic discharge and voltage transients common in industrial and commercial settings.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: I need more than 4 serial ports. What are my options?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: SystemBase offers 8-port USB-to-serial adapters in both RS-232 and RS-422\/485 configurations for even larger installations. Check our full SystemBase product line for the right fit.\u003c\/p\u003e\n\u003ch3\u003eAdditional Resources\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.sysbas.com\/en\/portfolio-item\/multi-4usb-rs232\/\" title=\"Multi-4\/USB RS232 USB to RS-232 4-Port DB9 Serial Adapter\/Converter\" target=\"_blank\"\u003eMulti-4\/USB RS232 USB to RS-232 4-Port DB9 Serial Adapter\/Converter Manual, Utilities and Specifications Downloads (SystemBase Website\u003c\/a\u003e\u003ca href=\"https:\/\/www.sysbas.com\/en\/portfolio-item\/multi-2usb-rs232\/\" title=\"Multi-2\/USB RS232 USB to RS-232 2-Port DB9 Serial Adapter\/Converter\" target=\"_blank\"\u003e)\u003c\/a\u003e\u003c\/p\u003e","brand":"SystemBase","offers":[{"title":"Default Title","offer_id":44412615065849,"sku":"Multi-4-USB-RS232","price":149.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1641\/0911\/products\/usb-to-rs-232-4-port-db9-serial-adapterconverter-multi-4usb-rs232-229874.jpg?v=1707417374"},{"product_id":"usb-to-rs422-485-4-port-db9-serial-adapter-converter-multi-4-usb-combo","title":"SystemBase Multi-4\/USB COMBO 4-Port USB to RS-422\/485 Serial Adapter | Industrial-Grade Surge Protection","description":"\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003eRunning a Multi-Device RS-422\/485 Network? Four Ports. One USB Connection. Zero Hassle.\u003c\/h3\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003eIndustrial facilities, building automation systems, and data acquisition networks don't run on one or two serial devices — they run on dozens. PLCs, sensors, meters, and controllers spread across a factory floor or throughout a building all need to talk to a central PC. But modern computers don't come with serial ports, and two ports often aren't enough.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cspan class=\"font-semibold\"\u003eThe SystemBase Multi-4\/USB COMBO gives you four independent RS-422\/RS-485 serial ports from a single USB connection.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003ePlug it in, install the drivers, and you're managing four separate serial channels — each independently configurable for RS-422 or RS-485. No expansion cards, no multiple adapters cluttering your desk, no compromises.\u003c\/p\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e🔧 Real-World Applications the Multi-4\/USB COMBO Solves\u003c\/h3\u003e\n\u003cul class=\"ml-4 list-outside list-disc\"\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eIndustrial Automation \u0026amp; SCADA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Connect four PLCs, motor controllers, or HMI panels simultaneously for centralized programming, monitoring, and SCADA data collection over RS-485 multi-drop networks.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eBuilding Management \u0026amp; HVAC\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Interface with multiple BACnet MS\/TP controllers, lighting systems, energy meters, and zone controllers from a single workstation — each on its own dedicated serial channel.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eMulti-Drop Sensor Networks\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Manage up to 32 devices per port on RS-485 buses — that's up to 128 addressable devices from one adapter. Ideal for distributed temperature sensors, flow meters, and environmental monitoring arrays.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eEnergy \u0026amp; Utility Metering\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Poll multiple smart meters, power analyzers, and substation equipment simultaneously without swapping cables or juggling adapters.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eSecurity \u0026amp; Access Control\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Integrate card readers, door controllers, alarm panels, and CCTV serial interfaces into a unified management platform — four zones, four ports, one PC.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eTelecommunications \u0026amp; Network Infrastructure\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Configure and manage multiple pieces of legacy network equipment, modems, and telecom gear through dedicated serial console connections.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eTest \u0026amp; Measurement Labs\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Run four instruments at once — oscilloscopes, signal generators, power supplies, and data loggers — all feeding data into your analysis software simultaneously.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cspan class=\"font-semibold\"\u003eWater\/Wastewater \u0026amp; Process Control\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e— Monitor and control pumps, valves, chemical dosing systems, and level sensors across multiple RS-485 loops from a single operator station.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e💡 Why Professionals Choose the Multi-4\/USB COMBO\u003c\/h3\u003e\n\u003cdiv class=\"my-4 w-full overflow-x-auto\"\u003e\n\u003ctable class=\"min-w-full table-auto border-collapse border-spacing-0\"\u003e\n\u003cthead class=\"border-b border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eBenefit\u003c\/th\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eWhat It Means for You\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003e4 Independent Serial Ports\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eManage four separate RS-422\/485 channels from one USB connection. No more daisy-chaining multiple 2-port adapters or fighting for USB ports on your PC.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003e±15kV Surge Protection\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eBuilt-in industrial-grade surge suppression on every port protects your equipment and PC from voltage spikes — no blown ports, no costly repairs. Critical for factory floors, outdoor installations, and electrically noisy environments.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003e921.6 Kbps Communication Speed\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eBlazing-fast serial throughput on every port handles high-speed data acquisition and real-time control applications without bottlenecks — even when all four ports are active.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eSwitchable RS-422 \/ RS-485 Per Port\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eOne adapter, two protocols, four ports. Select RS-422 (full-duplex, point-to-point) or RS-485 (half-duplex, multi-drop) independently on each port — maximum flexibility from a single device.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eAuto Toggling (Bus I\/O Control)\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eAutomatic transmit\/receive direction switching for RS-485 eliminates the need for manual RTS\/CTS flow control coding — just plug in and communicate. Saves development time and reduces integration headaches.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eLatching USB Connector\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eThe USB cable locks into place, preventing accidental disconnection in vibration-prone industrial environments. No more mystery disconnects on the shop floor.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eTX\/RX LED Indicators\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eInstantly verify data is flowing on each of the four ports — invaluable for troubleshooting and commissioning multi-device installations.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eSlew-Rate Limiting\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eReduces electromagnetic interference (EMI) for cleaner signals in electrically noisy environments like manufacturing plants, substations, and data centers.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eCompact, External Design\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eNo need to open your PC or install expansion cards. Works with desktops, laptops, and industrial PCs — take it wherever the job is.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e📦 What's in the Box\u003c\/h3\u003e\n\u003cul class=\"ml-4 list-outside list-disc\"\u003e\n\u003cli class=\"py-0.5\"\u003eMulti-4\/USB COMBO adapter unit with 4× DB9 male serial ports\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003eUSB cable with latching connector\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003eUser manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e⚙️ Technical Specifications\u003c\/h3\u003e\n\u003cdiv class=\"my-4 w-full overflow-x-auto\"\u003e\n\u003ctable class=\"min-w-full table-auto border-collapse border-spacing-0\"\u003e\n\u003cthead class=\"border-b border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eSpecification\u003c\/th\u003e\n\u003cth class=\"px-4 py-2 text-left text-sm font-semibold whitespace-nowrap min-w-[100px]\"\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eSerial Interface\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eRS-422 \/ RS-485 (selectable per port)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eNumber of Ports\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e4\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eConnector Type\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eDB9 Male\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eUSB Standard\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eUSB 2.0 (Full Speed)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eMax Baud Rate\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e921.6 Kbps\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eSurge Protection\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e±15kV (ESD)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eBus Control\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eAuto Toggling (automatic RS-485 direction control)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eSignal Control\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eSlew-rate limiting for reduced EMI\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eLED Indicators\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eTX\/RX per port\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eUSB Connection\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eLatching connector (prevents accidental disconnect)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eOS Support\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eWindows \u0026amp; Linux\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"border-b border-neutral-300 dark:border-neutral-800\/90\"\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003e\u003cspan class=\"font-semibold\"\u003eManufacturer\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd class=\"px-4 py-3 text-sm align-top min-w-[100px] max-w-[600px]\"\u003e\n\u003cdiv class=\"break-words overflow-wrap-anywhere\"\u003eSystemBase (South Korea)\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003e🛡️ Buy with Confidence\u003c\/h3\u003e\n\u003cul class=\"ml-4 list-outside list-disc\"\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eAuthorized US Distributor\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Envistia Mall is an authorized SystemBase distributor. You're getting genuine product with full manufacturer support.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eShips from the USA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Fast domestic shipping, no international customs delays.\u003c\/li\u003e\n\u003cli class=\"py-0.5\"\u003e\n\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eTechnical Support\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Need help with installation, driver setup, or wiring? Our support team is here to help.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"my-7 border-neutral-300 dark:border-neutral-700\"\u003e\n\u003ch3 class=\"mb-1 mt-4 break-words text-lg font-semibold\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Can I set each port to a different protocol — some RS-422 and some RS-485?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Yes! Each of the four ports can be independently configured for either RS-422 or RS-485 mode. You could run two ports as RS-422 for point-to-point connections and two as RS-485 for multi-drop networks — all from the same adapter.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: How many devices can I connect total?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Each RS-485 port supports up to 32 devices on a multi-drop bus. With four ports, you can theoretically address up to 128 RS-485 devices from a single adapter. RS-422 ports support one device each in point-to-point mode.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Do I need to install drivers?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Yes, a simple driver installation is required. Drivers are included on CD and are also available for download. The adapter supports most Windows and Linux operating systems.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Will this work with my laptop?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Absolutely. Any PC, laptop, or industrial computer with an available USB port can use this adapter — no internal expansion slots needed.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: What does \"Auto Toggling\" mean?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: In RS-485 half-duplex mode, the adapter automatically switches between transmit and receive — you don't need to write custom code to control the data direction. This simplifies integration and reduces development time.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: How is this different from the 2-port Multi-2\/USB COMBO?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Same industrial-grade quality, same features — just doubled capacity. The Multi-4\/USB COMBO gives you four RS-422\/485 ports instead of two, making it the right choice when you need to manage more serial devices from a single workstation. If two ports are enough, the Multi-2\/USB COMBO is a more compact and cost-effective option.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: How does the surge protection work?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: The adapter includes built-in ±15kV surge suppression on all serial lines across all four ports, protecting both the adapter and your connected PC from electrostatic discharge and voltage transients common in industrial settings.\u003c\/p\u003e\n\u003cp class=\"overflow-wrap-anywhere mb-4 break-words text-base font-normal leading-7 last:mb-0 [li_\u0026amp;]:mb-0\"\u003e\u003cstrong\u003e\u003cspan class=\"font-semibold\"\u003eQ: Do you also carry a 4-port RS-232 version?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e \u003cbr\u003e\u003c\/span\u003eA: Yes! The SystemBase Multi-4\/USB RS232 provides four RS-232 serial ports for point-to-point connections to devices like printers, scanners, instruments, and console ports. Check our full SystemBase product line for the right fit.\u003c\/p\u003e\n\u003ch3\u003eAdditional Resources:\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.sysbas.com\/en\/portfolio-item\/multi-4usb-combo\/\" title=\"Multi-4\/USB COMBO USB to RS-422\/RS-485 4-Port DB9 Serial Adapter\/Converter\" target=\"_blank\"\u003eMulti-4\/USB COMBO USB to RS-42\/485 4-Port DB9 Serial Adapter\/Converter Manual, Utilities and Specifications Downloads (SystemBase Website\u003c\/a\u003e\u003ca title=\"Multi-2\/USB RS232 USB to RS-232 2-Port DB9 Serial Adapter\/Converter\" href=\"https:\/\/www.sysbas.com\/en\/portfolio-item\/multi-2usb-rs232\/\" target=\"_blank\"\u003e)\u003c\/a\u003e\u003c\/p\u003e","brand":"SystemBase","offers":[{"title":"Default Title","offer_id":44412637217017,"sku":"Multi-4-USB-COMBO","price":179.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1641\/0911\/products\/usb-to-rs422485-4-port-db9-serial-adapterconverter-multi-4usb-combo-474958.jpg?v=1707417375"},{"product_id":"systembase-multi-8u-combo-usb-to-8-port-rs422-rs485-serial-converter","title":"SystemBase Multi-8U Combo — USB to 8-Port RS422\/RS485 Serial Converter Adapter","description":"\u003ch2\u003e📋 Overview\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eSystemBase Multi-8U Combo\u003c\/strong\u003e is a professional-grade USB to 8-port serial converter that instantly adds eight RS422\/RS485 (Combo) serial ports to any Windows or Linux computer through a single USB 2.0 connection. With communication speeds up to 921.6Kbps, ±15kV surge protection on every port, and per-port TX\/RX LEDs for real-time status monitoring, the Multi-8U Combo is built for demanding industrial and commercial serial communication environments.\u003c\/p\u003e\n\u003cp\u003eEach port features a standard DB9 connector and can be independently configured for RS422 (Point-to-Point or Multi-Drop) or RS485 (Echo or Non-Echo) mode using convenient DIP switches — no software configuration required. The unit is USB bus-powered and includes a latching USB connector for secure, vibration-resistant connections.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e⭐ Key Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e8 Serial Ports from One USB Connection\u003c\/strong\u003e — Adds eight RS422\/RS485 Combo serial ports through a single USB 2.0 port\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Speed Communication\u003c\/strong\u003e — Supports data rates up to 921.6Kbps for fast, reliable serial data transfer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible RS422\/RS485 Modes\u003c\/strong\u003e — Each port is independently configurable via DIP switches: RS422 Point-to-Point, RS422 Multi-Drop, RS485 Non-Echo, or RS485 Echo\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e±15kV Surge Protection\u003c\/strong\u003e — Built-in ESD protection on every port safeguards connected equipment from electrical surges\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTX\/RX LEDs Per Port\u003c\/strong\u003e — Real-time transmit and receive activity indicators on each of the 8 ports for easy diagnostics\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuto Toggling\u003c\/strong\u003e — Automatic control of bus I\/O direction for RS422\/RS485 communication, simplifying half-duplex setups\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlew-Rate Limit Control\u003c\/strong\u003e — Configurable slew-rate limiting reduces EMI and signal reflections for long cable runs (limits speed to 250Kbps when enabled)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTermination Resistor Support\u003c\/strong\u003e — Built-in 120Ω termination resistors for RS422 and RS485 can be enabled via jumper settings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e+5V Power on Pin 9\u003c\/strong\u003e — Optional external DC adapter allows +5V power delivery through pin 9 of each DB9 connector to power connected devices\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDB9 Male or Female Serial Connectors\u003c\/strong\u003e — Available with either DB9 Male or DB9 Female serial connectors\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLatching USB Connector\u003c\/strong\u003e — Secure locking USB connection prevents accidental disconnection in industrial environments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlug and Play\u003c\/strong\u003e — Automatically detected by Windows and Linux — no reboot required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUSB Bus-Powered\u003c\/strong\u003e — No external power supply required for standard operation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e📊 Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Ports\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBus Interface\u003c\/td\u003e\n\u003ctd\u003eUSB 2.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSerial Interface\u003c\/td\u003e\n\u003ctd\u003eCombo — RS422 \/ RS485 (switchable per port)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eController\u003c\/td\u003e\n\u003ctd\u003eFT4232H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSerial Connector\u003c\/td\u003e\n\u003ctd\u003eDB9 Male or DB9 Female - Type selected above\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Communication Speed\u003c\/td\u003e\n\u003ctd\u003e921.6Kbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRS422 Signals\u003c\/td\u003e\n\u003ctd\u003eTXD+, TXD−, RXD+, RXD−\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRS485 Signals\u003c\/td\u003e\n\u003ctd\u003eTRXD+, TRXD−\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurge Protection\u003c\/td\u003e\n\u003ctd\u003e±15kV ESD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTermination Resistor\u003c\/td\u003e\n\u003ctd\u003e120Ω (RS422 and RS485, jumper-selectable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLED Indicators\u003c\/td\u003e\n\u003ctd\u003eTX and RX per port (16 LEDs total)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply\u003c\/td\u003e\n\u003ctd\u003eUSB VBUS (5V \/ 500mA) — external DC adapter optional\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePin 9 Power Output\u003c\/td\u003e\n\u003ctd\u003e+5V DC (requires external adapter, max 1A total)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported OS\u003c\/td\u003e\n\u003ctd\u003eWindows 7 \/ 8 \/ 10 \/ 11, Windows Server 2008+, Linux Kernel 2.6+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eArchitecture Support\u003c\/td\u003e\n\u003ctd\u003e32-bit and 64-bit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eApprox. 210 × 84 × 26 mm (8.27 x 3.3 x 1 inches) L × W × H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eApprox. 320g (11.3 oz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eSystemBase Co., Ltd.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch2\u003e🔧 Setup \u0026amp; Configuration\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnect the USB cable\u003c\/strong\u003e — Plug the latching USB cable into the Multi-8U Combo and connect the other end to an available USB port on your computer. You should hear a click when the latch engages.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall the driver\u003c\/strong\u003e — Windows will attempt automatic driver installation. If needed, download the latest driver from the SystemBase website and install manually. Linux users should contact SystemBase technical support at tech@sysbas.com.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfigure each port\u003c\/strong\u003e — Use the 2-position DIP switch on each port to select your desired mode: RS422 Point-to-Point (OFF\/OFF), RS422 Multi-Drop (OFF\/ON), RS485 Non-Echo (ON\/OFF, default), or RS485 Echo (ON\/ON).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSet termination resistors (if needed)\u003c\/strong\u003e — Use the internal jumpers to enable the 120Ω termination resistor for RS422 or RS485 as required by your network topology.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnect your serial devices\u003c\/strong\u003e — Attach your RS422 or RS485 devices to the DB9 connectors and verify communication using the TX\/RX LEDs.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cblockquote\u003e\n\u003cp\u003e\u003cstrong\u003e💡 Tip:\u003c\/strong\u003e The slew-rate limit jumper defaults to disabled (10M mode, max 921.6Kbps). For long cable runs where signal integrity is a concern, enable the 250K slew-rate limit mode to reduce EMI and reflection waves.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003chr\u003e\n\u003ch2\u003e📌 DIP Switch Settings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSW1\u003c\/th\u003e\n\u003cth\u003eSW2\u003c\/th\u003e\n\u003cth\u003eInterface\u003c\/th\u003e\n\u003cth\u003eMode\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOFF\u003c\/td\u003e\n\u003ctd\u003eOFF\u003c\/td\u003e\n\u003ctd\u003eRS422\u003c\/td\u003e\n\u003ctd\u003ePoint-to-Point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOFF\u003c\/td\u003e\n\u003ctd\u003eON\u003c\/td\u003e\n\u003ctd\u003eRS422\u003c\/td\u003e\n\u003ctd\u003eMulti-Drop\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eON (Default)\u003c\/td\u003e\n\u003ctd\u003eOFF (Default)\u003c\/td\u003e\n\u003ctd\u003eRS485\u003c\/td\u003e\n\u003ctd\u003eNon-Echo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eON\u003c\/td\u003e\n\u003ctd\u003eON\u003c\/td\u003e\n\u003ctd\u003eRS485\u003c\/td\u003e\n\u003ctd\u003eEcho\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch2\u003e📦 What's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1x SystemBase Multi-8U Combo (RS422\/RS485) Converter - Serial connector type selected above\u003c\/li\u003e\n\u003cli\u003e1x Latching USB Cable\u003c\/li\u003e\n\u003cli\u003e1x Quick Start Guide\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eExternal DC power adapter is not included. Required only if supplying +5V power through DB9 pin 9.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e🔌 Compatible With\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eWindows 7, 8, 8.1, 10, and 11 (32-bit and 64-bit)\u003c\/li\u003e\n\u003cli\u003eWindows Server 2008, 2012, 2016, 2019, 2022\u003c\/li\u003e\n\u003cli\u003eLinux (Kernel 2.6 and above — contact SystemBase for driver support)\u003c\/li\u003e\n\u003cli\u003eAny RS422 or RS485 serial device with DB9 connectivity\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e🎯 Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eIndustrial automation and SCADA systems\u003c\/li\u003e\n\u003cli\u003ePOS (Point of Sale) terminal networks\u003c\/li\u003e\n\u003cli\u003eBuilding management and access control systems\u003c\/li\u003e\n\u003cli\u003eData acquisition and laboratory instrumentation\u003c\/li\u003e\n\u003cli\u003eMulti-device RS485 sensor networks\u003c\/li\u003e\n\u003cli\u003eSurveillance and security system integration\u003c\/li\u003e\n\u003cli\u003eCNC machine and PLC communication\u003c\/li\u003e\n\u003cli\u003eTelecommunications equipment management\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e⚠️ Important Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eThe Multi-8U Combo model supports \u003cstrong\u003eRS422 and RS485 only\u003c\/strong\u003e. If you need RS232 ports, look for the \u003ca href=\"https:\/\/envistiamall.com\/products\/systembase-multi-8u-rs232-usb-to-8-port-rs232-serial-converter\" target=\"_blank\" title=\"SystemBase Multi-8U RS232 — USB to 8-Port RS232 Serial Converter Adapter\" rel=\"noopener\"\u003eMulti-8U RS232 model\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eAn external 5V DC adapter is required to supply power through pin 9 of the DB9 connectors. Without the adapter, pin 9 does not carry power.\u003c\/li\u003e\n\u003cli\u003eWhen using the slew-rate limit feature (250K mode), maximum communication speed is reduced to 250Kbps.\u003c\/li\u003e\n\u003cli\u003eFor Linux driver support, contact SystemBase technical support at tech@sysbas.com.\u003c\/li\u003e\n\u003cli\u003eThe latching USB connector provides a secure connection — press the spring button lightly and sweep to disconnect.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e📄 Documentation \u0026amp; Resources\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.sysbas.com\/en\/downloads\/usb-serial-series-02-en\/\" title=\"SystemBase Multi-8U Combo User Manual, Driver and Utilities Downloads\" rel=\"noopener\" target=\"_blank\"\u003eMulti-8U COMBO User Manual, Utilities and Specifications Downloads (SystemBase Website)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SystemBase","offers":[{"title":"Male","offer_id":48368006529273,"sku":"Multi-8-USB-COMBO-MALE","price":467.0,"currency_code":"USD","in_stock":false},{"title":"Female","offer_id":48368006562041,"sku":"Multi-8-USB-COMBO-FEMALE","price":479.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1641\/0911\/files\/systembase-multi-8u-combo-usb-to-8-port-rs422rs485-serial-converter-adapter-6374783.jpg?v=1778246648"},{"product_id":"systembase-multi-8u-rs232-usb-to-8-port-rs232-serial-converter","title":"SystemBase Multi-8U RS232 — USB to 8-Port RS232 Serial Converter Adapter","description":"\u003ch2\u003e📋 Overview\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eSystemBase Multi-8U RS232\u003c\/strong\u003e is a professional-grade USB to 8-port RS232 serial converter that instantly adds eight full-signal RS232 serial ports to any Windows or Linux computer through a single USB 2.0 connection. With communication speeds up to 921.6Kbps, ±15kV surge protection on every port, and per-port TX\/RX LEDs for real-time status monitoring, the Multi-8U RS232 is built for demanding industrial and commercial serial communication environments.\u003c\/p\u003e\n\u003cp\u003eEach port features a standard DB9 connector with full RS232 handshaking signals — TXD, RXD, RTS, CTS, DTR, DSR, DCD, RI, and GND — making it ideal for connecting legacy serial devices such as modems, barcode scanners, POS terminals, and industrial controllers. The unit is USB bus-powered and includes a latching USB connector for secure, vibration-resistant connections.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e⭐ Key Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e8 RS232 Serial Ports from One USB Connection\u003c\/strong\u003e — Adds eight full-signal RS232 serial ports through a single USB 2.0 port\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Speed Communication\u003c\/strong\u003e — Supports data rates up to 921.6Kbps for fast, reliable serial data transfer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull RS232 Handshaking\u003c\/strong\u003e — All 9 signals supported per port: TXD, RXD, RTS, CTS, DTR, DSR, DCD, RI, and GND\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e±15kV Surge Protection\u003c\/strong\u003e — Built-in ESD protection on every port safeguards connected equipment from electrical surges\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTX\/RX LEDs Per Port\u003c\/strong\u003e — Real-time transmit and receive activity indicators on each of the 8 ports for easy diagnostics\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e+5V Power on Pin 9\u003c\/strong\u003e — Optional external DC adapter allows +5V power delivery through pin 9 of each DB9 connector to power connected devices\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDB9 Male or Female Serial Connectors\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— Available with either DB9 Male or DB9 Female serial connectors\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLatching USB Connector\u003c\/strong\u003e — Secure locking USB connection prevents accidental disconnection in industrial environments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlug and Play\u003c\/strong\u003e — Automatically detected by Windows and Linux — no reboot required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUSB Bus-Powered\u003c\/strong\u003e — No external power supply required for standard operation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e📊 Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Ports\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBus Interface\u003c\/td\u003e\n\u003ctd\u003eUSB 2.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSerial Interface\u003c\/td\u003e\n\u003ctd\u003eRS232\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eController\u003c\/td\u003e\n\u003ctd\u003eFT4232H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSerial Connector\u003c\/td\u003e\n\u003ctd\u003eDB9 Male or DB9 Female - Type selected above\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Communication Speed\u003c\/td\u003e\n\u003ctd\u003e921.6Kbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRS232 Signals\u003c\/td\u003e\n\u003ctd\u003eTXD, RXD, RTS, CTS, DTR, DSR, DCD, RI, GND\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurge Protection\u003c\/td\u003e\n\u003ctd\u003e±15kV ESD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLED Indicators\u003c\/td\u003e\n\u003ctd\u003eTX and RX per port (16 LEDs total)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply\u003c\/td\u003e\n\u003ctd\u003eUSB VBUS (5V \/ 500mA) — external DC adapter optional\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePin 9 Power Output\u003c\/td\u003e\n\u003ctd\u003e+5V DC (requires external adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported OS\u003c\/td\u003e\n\u003ctd\u003eWindows 7 \/ 8 \/ 10 \/ 11, Windows Server 2008+, Linux Kernel 2.6+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eArchitecture Support\u003c\/td\u003e\n\u003ctd\u003e32-bit and 64-bit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eApprox. 210 × 84 × 26 mm (8.27 x 3.31 x 1.02 inches) L × W × H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eApprox. 320g (11.3 oz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eSystemBase Co., Ltd.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch2\u003e📌 DB9 Pin Assignment (RS232)\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003ePin\u003c\/th\u003e\n\u003cth\u003eSignal\u003c\/th\u003e\n\u003cth\u003eDirection\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003eDCD (Data Carrier Detect)\u003c\/td\u003e\n\u003ctd\u003eInput\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003eRXD (Receive Data)\u003c\/td\u003e\n\u003ctd\u003eInput\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003ctd\u003eTXD (Transmit Data)\u003c\/td\u003e\n\u003ctd\u003eOutput\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003eDTR (Data Terminal Ready)\u003c\/td\u003e\n\u003ctd\u003eOutput\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003ctd\u003eGND (Signal Ground)\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003eDSR (Data Set Ready)\u003c\/td\u003e\n\u003ctd\u003eInput\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003ctd\u003eRTS (Request to Send)\u003c\/td\u003e\n\u003ctd\u003eOutput\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003eCTS (Clear to Send)\u003c\/td\u003e\n\u003ctd\u003eInput\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e9\u003c\/td\u003e\n\u003ctd\u003eRI (Ring Indicator) \/ +5V Power\u003c\/td\u003e\n\u003ctd\u003eInput \/ Power Out\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cblockquote\u003e\n\u003cp\u003e\u003cstrong\u003e💡 Note:\u003c\/strong\u003e Pin 9 functions as RI (Ring Indicator) by default. When an external DC adapter is connected, pin 9 delivers +5V power to connected devices instead.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003chr\u003e\n\u003ch2\u003e🔧 Setup \u0026amp; Configuration\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnect the USB cable\u003c\/strong\u003e — Plug the latching USB cable into the Multi-8U RS232 and connect the other end to an available USB port on your computer. You should hear a click when the latch engages.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall the driver\u003c\/strong\u003e — Windows will attempt automatic driver installation. If needed, download the latest driver from the SystemBase website and install manually. Linux users should contact SystemBase technical support at tech@sysbas.com.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify COM port assignment\u003c\/strong\u003e — Open Device Manager (Windows) and confirm that 8 new COM ports appear under \"Ports (COM \u0026amp; LPT).\" You can reassign COM port numbers here if needed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnect your serial devices\u003c\/strong\u003e — Attach your RS232 devices to the DB9 connectors using standard straight-through or null-modem cables as required by your device.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify communication\u003c\/strong\u003e — Use the TX\/RX LEDs on each port to confirm data is being transmitted and received. Open a terminal program (such as PuTTY or Tera Term) to test communication.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cblockquote\u003e\n\u003cp\u003e\u003cstrong\u003e💡 Tip:\u003c\/strong\u003e If your serial device requires power from the converter, connect an external 5V DC adapter to the Multi-8U RS232. This enables +5V power delivery through pin 9 of each DB9 connector.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003chr\u003e\n\u003ch2\u003e📦 What's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1x SystemBase Multi-8U RS232 Converter\u003cspan\u003e - Serial connector type selected above\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e1x Latching USB Cable\u003c\/li\u003e\n\u003cli\u003e1x Quick Start Guide\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eExternal DC power adapter is not included. Required only if supplying +5V power through DB9 pin 9.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e🔌 Compatible With\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eWindows 7, 8, 8.1, 10, and 11 (32-bit and 64-bit)\u003c\/li\u003e\n\u003cli\u003eWindows Server 2008, 2012, 2016, 2019, 2022\u003c\/li\u003e\n\u003cli\u003eLinux (Kernel 2.6 and above — contact SystemBase for driver support)\u003c\/li\u003e\n\u003cli\u003eAny RS232 serial device with DB9 connectivity\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e🎯 Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003ePOS (Point of Sale) terminal networks\u003c\/li\u003e\n\u003cli\u003eBarcode scanner and receipt printer connectivity\u003c\/li\u003e\n\u003cli\u003eIndustrial automation and SCADA systems\u003c\/li\u003e\n\u003cli\u003eLegacy modem and dial-up equipment\u003c\/li\u003e\n\u003cli\u003eData acquisition and laboratory instrumentation\u003c\/li\u003e\n\u003cli\u003eBuilding management and access control systems\u003c\/li\u003e\n\u003cli\u003eCNC machine and PLC communication\u003c\/li\u003e\n\u003cli\u003eSurveillance and security system integration\u003c\/li\u003e\n\u003cli\u003eTelecommunications equipment management\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e⚠️ Important Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eThe Multi-8U RS232 model supports \u003cstrong\u003eRS232 only\u003c\/strong\u003e. If you need RS422\/RS485 ports, look for the \u003ca href=\"https:\/\/envistiamall.com\/products\/systembase-multi-8u-combo-usb-to-8-port-rs422-rs485-serial-converter\" target=\"_blank\" title=\"SystemBase Multi-8U Combo — USB to 8-Port RS422\/RS485 Serial Converter Adapter\" rel=\"noopener\"\u003eMulti-8U Combo model\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eAn external 5V DC adapter is required to supply power through pin 9 of the DB9 connectors. Without the adapter, pin 9 functions as RI (Ring Indicator).\u003c\/li\u003e\n\u003cli\u003eFor Linux driver support, contact SystemBase technical support at tech@sysbas.com.\u003c\/li\u003e\n\u003cli\u003eThe latching USB connector provides a secure connection — press the spring button lightly and sweep to disconnect.\u003c\/li\u003e\n\u003cli\u003eMaximum cable length for RS232 communication depends on baud rate. For best results at high speeds, keep cables under 15 meters (50 feet).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e📄 Documentation \u0026amp; Resources\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.sysbas.com\/en\/downloads\/usb-serial-series-02-en\/\" title=\"SystemBase Multi-8U RS232 User Manual, Driver and Utilities Downloads\" rel=\"noopener\" target=\"_blank\"\u003eMulti-8U RS232 User Manual, Utilities and Specifications Downloads (SystemBase Website)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SystemBase","offers":[{"title":"Male","offer_id":48368023339257,"sku":"Multi-8-USB-RS232-MALE","price":329.0,"currency_code":"USD","in_stock":false},{"title":"Female","offer_id":48368023372025,"sku":"Multi-8-USB-RS232-FEMALE","price":349.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1641\/0911\/files\/systembase-multi-8u-rs232-usb-to-8-port-rs232-serial-converter-adapter-5775606.jpg?v=1778246651"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1641\/0911\/collections\/Serial-to-usb-converters.png?v=1784730070","url":"https:\/\/envistiamall.com\/collections\/serial-to-usb-converters.oembed","provider":"Envistia Mall","version":"1.0","type":"link"}