SystemBase Multi-2/USB COMBO 2-Port USB to RS-422/485 Serial Adapter | Industrial-Grade Surge Protection
SystemBase Multi-2/USB COMBO 2-Port USB to RS-422/485 Serial Adapter | Industrial-Grade Surge Protection
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Still Running Legacy Serial Equipment? Connect It to Any Modern PC in Seconds.
Factories, 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.
The SystemBase Multi-2/USB COMBO bridges that gap instantly. Plug 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.
🔧 Real-World Applications The Multi-2/USB COMBO Adapter Solves
- Industrial Automation & Manufacturing — Connect PLCs, motor controllers, and HMI panels to a modern PC for programming, monitoring, or SCADA integration over RS-485 multi-drop networks.
- Building Management & HVAC — Interface with BACnet MS/TP controllers, lighting systems, and energy meters that communicate over RS-485.
- Point-of-Sale & Retail — Link barcode scanners, receipt printers, and cash drawers that still use serial connections to USB-only terminals.
- Laboratory & Scientific Instruments — Collect data from analytical instruments, scales, and environmental sensors with reliable RS-422/485 communication.
- Security & Access Control — Integrate card readers, door controllers, and alarm panels into centralized management software.
- Telecommunications & Networking — Configure and manage legacy network equipment, modems, and telecom infrastructure via serial console.
- Multi-Drop RS-485 Networks — Manage up to 32 devices on a single RS-485 bus per port — ideal for sensor arrays, distributed I/O, and metering systems.
💡 Why Choose the Multi-2/USB COMBO
| Benefit | What It Means for You |
|---|---|
|
±15kV Surge Protection
|
Built-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.
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921.6 Kbps Communication Speed
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Blazing-fast serial throughput handles high-speed data acquisition and real-time control applications without bottlenecks.
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Switchable RS-422 / RS-485 Per Port
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One 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.
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Auto Toggling (Bus I/O Control)
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Automatic transmit/receive direction switching for RS-485 eliminates the need for manual RTS/CTS flow control coding — just plug in and communicate.
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Latching USB Connector
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The USB cable locks into place, preventing accidental disconnection in vibration-prone industrial environments. No more mystery disconnects on the shop floor.
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TX/RX LED Indicators
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Instantly verify that data is flowing on each port — invaluable for troubleshooting and commissioning.
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Slew-Rate Limiting
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Reduces electromagnetic interference (EMI) for cleaner signals in electrically noisy environments like manufacturing plants and data centers.
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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 COMBO adapter unit with 2× DB9 male serial ports
- USB cable with latching connector
- User manual
⚙️ Technical Specifications
| Specification | Detail |
|---|---|
|
Serial Interface
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RS-422 / RS-485 (selectable per port)
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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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Bus Control
|
Auto Toggling (automatic RS-485 direction control)
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Signal Control
|
Slew-rate limiting for reduced EMI
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LED Indicators
|
TX/RX per port
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USB Connection
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Latching connector (prevents accidental disconnect)
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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: Can I use one port as RS-422 and the other as RS-485 at the same time?
A: Yes! Each port can be independently configured for either RS-422 or RS-485 mode, giving you maximum flexibility in mixed-protocol environments.
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: 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.
Q: What does "Auto Toggling" mean?
A: 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.
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 settings.
📄 Documentation & Resources
Multi-2/USB Combo Drivers, User Manual, and Utilities Downloads (SystemBase Website)
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