Rack-mountable 8-Port USB to Serial Adapter (RS-232/422/485) with Metal Case

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The USB to Octal Serial Adapter is designed to make serial port expansion quick and simple. Connecting to a USB port on your computer or USB hub, the USB Serial Adapter instantly adds eight RS-232/422/485 multi-electrical interface serial communication ports to your system. By taking advantage of the USB bus, the USB Serial Adapter makes it easier than ever to add 8 serial ports and serial devices to your system with easy plug-and-play and hot plug features. Adapting the new technology, the serial port expansion now takes the new bus with easy and convenient connectivity.

Plugging the USB Octal Serial Adapter to the USB port, the adapter is automatically detected and installed. There are no IRQ & COM port conflicts, since the port doesn’t require any additional IRQ, DMA, memory as resources on the system. The RS-232, or RS-422/485, port functions as native Windows COM port, and it is compatible with Windows serial communication applications. Each port is individually configurable. The adapter is designed with external switches to set RS-232, RS-422 or RS-485 ports and different operation modes conveniently. There is no need to open the chassis to set the ports.

The USB Serial Adapter provides instant connectivity to RS-232, or RS-422/485, communication devices for factory automation equipment, multi-drop data collection devices, barcode readers, time clocks, scales, data entry terminals, ATMs and serial communication in harsh environment. The USB to Serial Adapter is suitable for remote access, retail and industrial application, data collection and other applications requiring high speed RS-232, or RS-422/485, communication ports.


  • Adds eight high speed RS-232/422/485 serial ports via USB connection
  • 384 bytes receive and 128 bytes transmit buffer for high speed data throughput
  • Requires no IRQ, DMA, I/O port
  • RS-232 max bitrates up to 1Mbps
  • RS-422/485 max bitrates up to 3Mbps
  • Auto transmit buffer control for 2-wire RS-485 half-duplex operation
  • Biasing and termination resistors installed on-board
  • Supported RS-232 signals: DCD ,RxD ,TxD, DTR,GND,DSR,RTS,CTS,RI
  • Supported RS-422 signals: TxD-, TxD+, RxD+, RxD-, GND, RTS-, RTS+, CTS+, CTS-
  • Supported RS-485 4 wire signals: TxD-, TxD+, RxD+, RxD-, GND
  • Supported RS-485 2-wire signals: Data-, Data+, GND
  • Monitor LEDs of TxD, RxD indicating port status
  • AC 100V – 240V input for DC 5V, 4A switching power supply .
  • Virtual COM port drivers available for Windows 10, 8.1, 8, 7, Vista, 2003, XP, 2000
  • Industrial-grade metal case with DIN rail ears for DIN rail mounting


ComplianceUSB 2.0 Full Speed, USB 1.1 compliant
Speed12Mbps, full-speed USB
ConnectorUSB type B
FIFO128 bytes transmit 384 bytes receive
Operating SystemsWindows 2000 up to Windows 10
Windows Server 2000 up to 2018
Linux kernel 2.6+
Mac OS X support available
InstallationThe driver is already installed (Linux), or automatically downloading and installing device drivers after Device connection (Windows).
Serial Interface
Number of Ports8
ConnectorDB9 male
Max. SpeedRS-232:up to 1Mbps RS-422/485:up to 3Mbps
RS-232 SignalsTxD, RxD, RTS, CTS, DTR, DSR, DCD, GND, RI
RS-422 SignalsTxD-, TxD+, RxD+, RxD-, GND, RTS-, RTS+, CTS+, CTS-
RS-485 Signals (4 wire)TxD-, TxD+, RxD+, RxD-, GND
RS-485 Signals (2 wire)Data-, Data+, GND
Protection15kV ESD protection for all signals
Serial Communication Parameters
Data Bits7, 8
ParityNone, Even, Odd, Mark, Space
Stop Bit1, 2
Flow ControlHardware (RTS, CTS), XON/XOFF
Power InputBuilt-in AC to DC switching power supply, 100VAC to 240VAC
CasingSECC metal chassis suitable for DIN rail mounting Rack-mounting brackets included
Operating Temperature0°C to 60°C (32°F to 140°F)
Storage Temperature-40°C to 85°C (-40°F to 185°F)
Operating Humidity0% to 80% RH
Safety ApprovalsCE, FCC


Product Manual


Driver Installation

Uninstalling Drivers

Uninstallation Guide For Windows 2000

Uninstallation Guide For Windows 10, 8.1, 8, 7, Vista, XP, Server 2016, Server 2008, Server 2003