SystemBase Multi-4/USB RS232 — 4-Port USB to RS-232 Serial Adapter | Industrial-Grade Surge Protection
SystemBase Multi-4/USB RS232 — 4-Port USB to RS-232 Serial Adapter | Industrial-Grade Surge Protection
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Four Serial Devices. One USB Port. No Compromises.
When 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.
The SystemBase Multi-4/USB RS232 solves it cleanly. Plug 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.
🔧 Real-World Applications the Multi-4/USB RS232 Solves
- CNC & Machine Shop Operations — 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.
- Point-of-Sale & Retail — 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.
- Laboratory & Medical Instruments — Collect data from multiple analytical balances, spectrometers, blood analyzers, or environmental sensors simultaneously, feeding everything into your LIMS or analysis software in real time.
- IT & Network Administration — 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.
- Industrial Automation & Process Control — Interface with multiple PLCs, variable frequency drives, temperature controllers, and HMI panels from a single engineering workstation.
- Shipping & Logistics — Connect industrial scales, label printers, dimensioning systems, and barcode scanners in a warehouse packing station — one adapter handles the entire workflow.
- Building Management & HVAC — Program and diagnose multiple BMS controllers, thermostats, and energy management systems from a single service laptop during site visits.
- Education & Training Labs — Equip lab workstations with four serial ports for students working with microcontrollers, embedded systems, and serial communication projects.
💡 Why Professionals Choose the Multi-4/USB RS232
| Benefit | What It Means for You |
|---|---|
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4 Independent RS-232 Ports
|
Run four serial devices simultaneously from a single USB connection. No more daisy-chaining multiple adapters, fighting for USB ports, or swapping cables between devices.
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±15kV Surge Protection
|
Built-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.
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921.6 Kbps Communication Speed
|
Far 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.
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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 on every port. Many cheap adapters skip these — this one doesn't. Full hardware flow control ensures compatibility with demanding legacy devices.
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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, in the server rack, or during critical data transfers.
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TX/RX LED Indicators
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Instantly verify data is flowing on each of the four ports — invaluable for troubleshooting connections and commissioning multi-device installations.
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USB Bus-Powered
|
No 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.
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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-4/USB RS232 adapter unit with 4× DB9 male serial ports
- USB cable with latching connector
- User manual
⚙️ Technical Specifications
| Specification | Detail |
|---|---|
|
Serial Interface
|
RS-232
|
|
Number of Ports
|
4
|
|
Connector Type
|
DB9 Male
|
|
USB Standard
|
USB 2.0 (Full Speed)
|
|
Max Baud Rate
|
921.6 Kbps
|
|
Surge Protection
|
±15kV (ESD)
|
|
RS-232 Signals
|
TxD, RxD, RTS, CTS, DTR, DSR, DCD, RI, GND
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|
LED Indicators
|
TX/RX per port
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USB Connection
|
Latching connector (prevents accidental disconnect)
|
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Power
|
USB bus-powered (no external adapter required)
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OS Support
|
Windows & Linux
|
|
Manufacturer
|
SystemBase (South Korea)
|
🛡️ 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: Can I use all four ports at the same time?
A: 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.
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. Perfect for field technicians and service engineers.
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-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.
Q: How is this different from the 2-port Multi-2/USB RS232?
A: 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.
Q: How is this different from the Multi-4/USB COMBO?
A: 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.
Q: How does the surge protection work?
A: 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.
Q: I need more than 4 serial ports. What are my options?
A: 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.
Additional Resources
Multi-4/USB RS232 USB to RS-232 4-Port DB9 Serial Adapter/Converter Manual, Utilities and Specifications Downloads (SystemBase Website)
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