SystemBase Multi-4/USB COMBO 4-Port USB to RS-422/485 Serial Adapter | Industrial-Grade Surge Protection

Name: SystemBase Multi-4/USB COMBO 4-Port USB to RS-422/485 Serial Adapter | Industrial-Grade Surge Protection
Brand: SystemBase
Price: 179.0 USD
Availability: InStock

$179.00

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Running a Multi-Device RS-422/485 Network? Four Ports. One USB Connection. Zero Hassle.

Industrial 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.

The SystemBase Multi-4/USB COMBO gives you four independent RS-422/RS-485 serial ports from a single USB connection. Plug 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.

🔧 Real-World Applications the Multi-4/USB COMBO Solves

Industrial Automation & SCADA — Connect four PLCs, motor controllers, or HMI panels simultaneously for centralized programming, monitoring, and SCADA data collection over RS-485 multi-drop networks.
Building Management & HVAC — 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.
Multi-Drop Sensor Networks — 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.
Energy & Utility Metering — Poll multiple smart meters, power analyzers, and substation equipment simultaneously without swapping cables or juggling adapters.
Security & Access Control — Integrate card readers, door controllers, alarm panels, and CCTV serial interfaces into a unified management platform — four zones, four ports, one PC.
Telecommunications & Network Infrastructure — Configure and manage multiple pieces of legacy network equipment, modems, and telecom gear through dedicated serial console connections.
Test & Measurement Labs — Run four instruments at once — oscilloscopes, signal generators, power supplies, and data loggers — all feeding data into your analysis software simultaneously.
Water/Wastewater & Process Control — Monitor and control pumps, valves, chemical dosing systems, and level sensors across multiple RS-485 loops from a single operator station.

💡 Why Professionals Choose the Multi-4/USB COMBO

Benefit	What It Means for You
4 Independent Serial Ports	Manage 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.
±15kV Surge Protection	Built-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.
921.6 Kbps Communication Speed	Blazing-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.
Switchable RS-422 / RS-485 Per Port	One 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.
Auto Toggling (Bus I/O Control)	Automatic 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.
Latching USB Connector	The USB cable locks into place, preventing accidental disconnection in vibration-prone industrial environments. No more mystery disconnects on the shop floor.
TX/RX LED Indicators	Instantly verify data is flowing on each of the four ports — invaluable for troubleshooting and commissioning multi-device installations.
Slew-Rate Limiting	Reduces electromagnetic interference (EMI) for cleaner signals in electrically noisy environments like manufacturing plants, substations, and data centers.
Compact, External Design	No need to open your PC or install expansion cards. Works with desktops, laptops, and industrial PCs — take it wherever the job is.

📦 What's in the Box

Multi-4/USB COMBO adapter unit with 4× DB9 male serial ports
USB cable with latching connector
User manual

⚙️ Technical Specifications

Specification	Detail
Serial Interface	RS-422 / RS-485 (selectable per port)
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)
Bus Control	Auto Toggling (automatic RS-485 direction control)
Signal Control	Slew-rate limiting for reduced EMI
LED Indicators	TX/RX per port
USB Connection	Latching connector (prevents accidental disconnect)
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 set each port to a different protocol — some RS-422 and some RS-485?
A: 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.

Q: How many devices can I connect total?
A: 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.

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 is this different from the 2-port Multi-2/USB COMBO?
A: 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.

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 settings.

Q: Do you also carry a 4-port RS-232 version?
A: 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.