SystemBase Multi-2/USB RS232 2-Port USB to RS-232 Serial Adapter | Industrial-Grade Surge Protection
SystemBase Multi-2/USB RS232 2-Port USB to RS-232 Serial Adapter | Industrial-Grade Surge Protection
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Your Serial Devices Aren't Going Anywhere. Your PC's Serial Ports Already Did.
From 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.
The SystemBase Multi-2/USB RS232 fixes that in under a minute. Plug 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.
🔧 Real-World Applications the Multi-2/USB RS232 Adapter Solves
- CNC & Machine Tool Programming — 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.
- Point-of-Sale & Retail — Link receipt printers, cash drawers, barcode scanners, and customer displays that still use RS-232 serial to your USB-only POS terminal.
- Laboratory & Medical Instruments — Collect data from analytical balances, spectrometers, blood analyzers, and environmental sensors that output via RS-232.
- IT & Network Administration — Access the serial console on routers, switches, firewalls, and UPS systems for configuration, firmware updates, and troubleshooting.
- Industrial Automation & Process Control — Interface with PLCs, variable frequency drives, temperature controllers, and HMI panels that communicate over RS-232 serial.
- Building Management & HVAC — Connect to legacy BMS controllers, thermostats, and energy management systems that use RS-232 for programming and diagnostics.
- Shipping & Logistics — Interface with industrial scales, label printers, and dimensioning systems in warehouses and fulfillment centers.
- Hobbyist & Maker Projects — Connect Arduino, Raspberry Pi, and other microcontroller projects that use serial UART communication to your development PC.
💡 Why Professionals Choose the Multi-2/USB RS232
| Benefit | What It Means for You |
|---|---|
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±15kV Surge Protection
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Built-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.
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921.6 Kbps Communication Speed
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Far 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.
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Two Independent RS-232 Ports
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Run 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.
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Full RS-232 Signal Support
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All 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.
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Latching USB Connector
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The 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.
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TX/RX LED Indicators
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Instantly verify data is flowing on each port — invaluable for troubleshooting connections and commissioning new equipment.
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USB Bus-Powered
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No external power supply needed. The adapter draws power directly from your USB port, keeping your workspace clean and your setup completely portable.
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Compact, External Design
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No need to open your PC or install expansion cards. Works with desktops, laptops, and industrial PCs — take it wherever the job is.
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📦 What's in the Box
- Multi-2/USB RS232 adapter unit with 2× DB9 male serial ports
- USB cable with latching connector
- User manual
⚙️ Technical Specifications
| Specification | Detail |
|---|---|
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Serial Interface
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RS-232
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Number of Ports
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2
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Connector Type
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DB9 Male
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USB Standard
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USB 2.0 (Full Speed)
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Max Baud Rate
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921.6 Kbps
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Surge Protection
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±15kV (ESD)
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RS-232 Signals
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TxD, RxD, RTS, CTS, DTR, DSR, DCD, RI, GND
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LED Indicators
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TX/RX per port
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USB Connection
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Latching connector (prevents accidental disconnect)
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Power
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USB bus-powered (no external adapter required)
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OS Support
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Windows & Linux
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Manufacturer
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SystemBase (South Korea)
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🛡️ Buy with Confidence
- Authorized US Distributor — Envistia Mall is an authorized SystemBase distributor. You're getting genuine product with full manufacturer support.
- Ships from the USA — Fast domestic shipping, no international customs delays.
- Technical Support — Need help with installation, driver setup, or wiring? Our support team is here to help.
Frequently Asked Questions
Q: Will this work with my laptop?
A: 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.
Q: Can I use both ports at the same time?
A: Yes. Each port operates as an independent COM port. You can run two different serial devices simultaneously at full speed.
Q: Do I need to install drivers?
A: 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.
Q: Does this support hardware flow control (RTS/CTS)?
A: 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.
Q: How is this different from the Multi-2/USB COMBO?
A: 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.
Q: How does the surge protection work?
A: 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.
Q: I need more than 2 serial ports. Do you have larger options?
A: 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.
📄 Documentation & Resources
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