8-Port USB to Serial Adapter (RS-422/485), DIN-rail & Wall Mountable Metal Case, 15KV ESD Protection

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The USB to industrial Octal RS-422/485 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 8 RS-422/485 multi-electrical interface serial communication ports to your system. By taking advantage of the USB bus, the USB-8COMi-M Adapter makes it easier than ever to add 8 RS-422/485 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 8-Port RS-422/485 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-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 the 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-422 or RS-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-422/485, communication ports.


  • Adds eight high speed RS-422/485 serial port by connecting to a USB port
  • SECC metal chassis suitable for DIN rail mounting
  • LEDs indicate power, TxD and RxD for easy port monitoring and diagnosis
  • Installs as a standard Windows COM port
  • Automatic transmit and receive control for 2-wire RS-485 half-duplex mode
  • Built-in termination and biasing
  • Serial port protected with surge protection of 15kV
  • Non-standard baudrates supported
  • Easy plug and play installation and RS-422/485 device connection
  • High speed serial port with baud rate up to 10Mbps
  • Supports Windows XP to 10, Server 2000 to Server 2016 (WHQL certified)
  • Supports Linux Kernel 2.4 and above
  • Supports Mac OS X 10.9 and above, driver signed by Apple


ComplianceUSB 2.0 High Speed, USB 1.1 compliant
Speed480Mbps, hi-speed USB
ConnectorUSB type B
FIFO2k Bytes transmit and 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. Speedup to 10Mbps
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 InputDC 12V, 1A external power adapter, terminal type
CasingSECC metal chassis suitable for DIN rail mounting
Operating Temperature0°C to 55°C (32°F to 131°F)
Storage Temperature-20°C to 75°C (-4°F to 167°F)
Operating Humidity5% to 95% RH
Safety ApprovalsCE, FCC


Product Manual


Driver Installation

You need to install driver first, prior to hardware installation. Do not connect the USB-to-Serial Adapter to the USB port of your computer, before you finish 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


RS-422 DB9 Male Connector Pinout

1 TxD- (A)
2 TxD+ (B)
3 RxD+ (B)
4 RxD- (A)
6 RTS- (A)
7 RTS+ (B)
8 CTS+ (B)
9 CTS- (A)

RS-485 4-Wire (Full duplex) DB9 Male Connector Pinout

1 TxD- (A)
2 TxD+ (B)
3 RxD+ (B)
4 RxD- (A)

RS-485 2-Wire (Half duplex) DB9 Male Connector Pinout

1 Data- (A)
2 Data+ (B)