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USB to Octal RS-232/422/485 Adapter Metal case with DIN-Rail

Special Price $290.00

Regular Price: $378.98

Quick Overview

Self-Powered industrial metal USB to 8-Port RS-232/422/485 Serial Adapter with DIN-Rail. Provides instant connectivity to serial communication devices for POS, factory automation equipment and more.

Availability: In stock



Manufacturer: SerialGear


USB to Octal RS-232/422/485 Adapter is constructed with a Metal chassis with DIN-Rail mounting, it is designed to make serial port expansion in a commercial industrial environment effortless using Plug-And Ply features. USB-8COMi-RM USB to Octal RS-232/422/485 Adapter is installed as a standard COM port with full modem control signals and data signals supported.

Serial port speeds up to 230,400 bps or 921,600 bps depending on the model,featuring 384 byte receive / 128 byte transmit buffering. Connecting to a USB port on your computer or USB hub, the USB Octal Serial Adapter instantly adds eight RS-232, or RS-422, or RS-485 serial communication ports to your system by taking advantage of the USB bus.

The USB Serial Adapter uses plug-and-play with hot plug features, by plugging the USB Serial Adapter into an available USB port, the adapter is automatically detected and installed. There is no configuration on the users part for IRQ & COM port conflicts. Since the additional COM ports don t require any additional IRQ, DMA, or memory as resources on the system, configurations isn't necessary.

The USB-8COMi-RM adapter is self-powered, and has a built-in switching power supply of 100V/240V (input) inside the chassis. The adapter is designed with eight external 4-pin dip switches to set RS-232, RS-422 or RS-485 mode conveniently, without the need to open the metal chassis, termination and biasing option are available for data transmission lines. Each port can be independently set to RS-232, RS-422, or RS-485, depending on your requirements for the serial application. The adapter can be also mounted to a 19" rack, the rack mount kits are included with the package contents.

The USB-to-Octal RS-232/422/485 Adapter provides instant connectivity to RS-232, RS-422, RS-485 communication devices for POS, factory automation equipment, multi-drop data collection devices, bar code readers, time clocks, scales, data entry terminals, PC to PC long distance communications, ATMs and serial communication in harsh environments. The USB-8COMi-RM USB to Industrial I/O provides industrial solution requiring single node or multi-drop communications over short and long distance.

USB to 8-Port RS232 RS422 RS485 Features and Specifications

  • Model No.: USB-8COMi-RM
  • Adds eight RS-232, or RS-422, or RS-485 serial ports by connecting to USB port
  • Installed as standard Windows COM port
  • Complete drivers support Windows XP, 2003, 2000, ME and 9x.
  • Easy plug & play installation and RS-232/RS-422/RS-485 device connection
  • Full RS-232 modem control signals
  • RS-232 data signals: TxD, RxD, RTS, CTS, DSR, DTR, DCD, RI, GND
  • RS-422 data signal: Tx-, Tx+, Rx+, Rx-, GND, RTS-, RTS+, CTS+, CTS-
  • RS-485 data signal: 4-wire: Tx-, Tx+, Rx+, Rx- 2-wire: data-, data+
  • COM Port Number can be changed to COM1 to COM4 to support Hyper Terminal, or any other COM port number required
  • FIFO: 128 byte transmit buffer 384 byte receive buffer
  • Serial port speed up to 230K bps
  • Eight DB9 male connectors
  • Full hardware and software flow control
  • Automatic transmit buffer control for 2-wire
  • RS485 half-duplex operation
  • ESD surge protection (15KV)
  • SECC sheet metal chassis with DIN rail bracket
  • Monitor LEDs of Power, TxD, RxD indicating power & port status
  • Four external dip switches for easy RS-232, RS-422, RS-485 mode settings.
    • -RS-232 mode: OFF, ON, ON, ON
    • -RS-422 mode: 4-wire with handshaking ON, ON, ON, ON
    • -RS-485 mode: 4-wire full duplex ON, OFF, ON, ON
    • -RS-485 mode: 2-wire half duplex with echo ON, OFF, OFF, ON
    • -RS-485 mode: 2-wire half duplex without echo ON, OFF, OFF, OFF

Serial Communication Parameters:

  • Parity: None, Even, Odd
  • Data bits: 7, 8
  • Flow control: RTS/CTS
  • Built-in 120 Ohm termination resistors for Tx/Rx/CTS termination
  • Built-in 750 Ohm biasing resistor for Tx/Rx biasing USB cable of 0.9 meter included
  • Built-in switching power supply of 100V~240V
  • Works with USB 1.1 & 2.0 host port


  • 257 mm x 152 mm x 44 mm
  • 277 mm x 152 mm x 44 mm (with DIN rail bracket)

System Support

  • Windows XP, 2003, 2000, ME and 9x.
  • Linux 2.4.0 and later
  • OpenBSD 2.9 and later & FreeBSD 4.7 and later

Drivers for the Windows operating systems are included on a CD-ROM disc. The latest versions of the Windows drivers as well as the drivers for Apple OS8/OS9/OSX, & Windows CE.NET (version 4.2 or greater) can be downloaded from or

Additional Information

Manufacturer SerialGear