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USB-4COMi-SI-M USB to Quad RS-422/485 Metal case with DIN-Rail

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Manufacturer: USBGEAR
Barcode: 3452876342456
Part Number: USB-4COMi-SI-M
Warranty: ONE YEAR
In Stock: Yes
Ship Weight: 2
Size: 3ft. Cable
Compatability: ITEM DESIGNED and Tested with SYSTEM

Item Works with Windows 98Second Edition Item Works with Windows ME Item Works with Windows 2000 Item Works with Windows XP Item Works with LINUX Operating System Item Works with Windows VISTA Item Works with Windows 7 Operating System

Our Price: $294.78
Quantity Discount(s)
Quantity Discount: 12 + $281.66 24 + $280.99
We Accept Visa Master Card And American Express as Well as Purchase Orders!
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Product Description

USB-4COMi-SI-M USB to Quad RS-422/485 Adapter

(with Optical Isolation & Surge Protection)

The USB-4COMi-SI-M USB-to-Optical isolated Quad RS-422/485 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 four RS-422,

or RS-485 serial communication ports to your system. By taking advantage of the

USB bus, the USB Serial Adapter makes it easier than ever to add serial ports and

serial devices to your system with easy plug-and-play and hot plug features.

By plugging the USB Serial Adapter to the USB port, the adapter is automatically

detected and installed. There are no IRQ & COM port conflicts, since the ports dont

require any additional IRQ, DMA, memory as resources on the system. The adapter

is self-powered, and one power supply adapter of 6V/2.1 Amp is included.

The adapter is designed with a four external 4-pin dip switches to set RS-422 or

RS-485 mode conveniently, without the need to open the metal chassis. Each port

can be independently set to RS-422 or to RS-485, depending on your requirement in


The adapter is with DIN rail bracket for industrial environment.

Termination and biasing option are available for data transmission lines.

Optical isolation and surge protection are available to USB-COMi-SI-M. The serial

line of RS-422/485 port is optically isolated with 2000 volt DC optical isolation. The

optical isolation protects your PC from spikes and surges on the RS-422/485

network, by converting the electrical pulse into an optical signal and then changing

it back into an electrical pulse. The surges and spikes cannot cross the optical link.

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The adapter is built-in surge protector to withstand electrostatic discharge and

power surges up to 25KV ESD.

The USB-to-Optical isolated Quad RS-422/485 Adapter provides instant connectivity

to RS-422 or 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 data

communication in harsh environments. The USB-4COMi-SI-M USB to Industrial I/O

provides industrial solution requiring single node or multi-drop communications

over short and long distance.

Complete drivers support Windows Vista, XP, 2003, 2000, ME and 9x.

Features & Specifications

Model No.:


Adds four RS-422, or

RS-485 serial ports by

connecting to USB port

Installed as standard

Windows COM port

2000V DC optical

isolation protection

25KV ESD surge


RS-422 data signal: Tx-, Tx+, Rx+, Rx-, GND,


RS-485 data signal:

4-wire: Tx-, Tx+, Rx+, Rx-

2-wire: data-, data+

FIFO: 128 byte transmit buffer

384 byte receive buffer

Serial port speed up to 920K bps

Four DB9 male connectors

Full hardware and software flow control

Automatic transmit buffer control for 2-wire RS485 half-duplex operation

2KV DC optical isolation protection

ESD surge protection (25KV)

Monitor LEDs of Power, TxD, RxD indicating power & port status

Four external dip switches for easy RS-422 or RS-485 mode settings

-no need to open chassis to set the mode

-RS-422 mode: 4-wire with handshaking ON, ON, OFF, OFF

-RS-485 mode: 4-wire full duplex ON, OFF, OFF, OFF, OFF

-RS-485 mode: 2-wire half duplex with echo OFF, OFF, OFF, ON

-RS-485 mode: 2-wire half duplex without echo OFF, OFF, ON, ON

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

Includes one power supply adapter of 6V/2.1A.

Easy plug & play installation and RS-422/RS-485 device connection

Works with USB 1.1 & 2.0 host port

SECC sheet metal chassis with DIN rail bracket

Dimensions: 167 mm x 102 mm x 29 mm

189 mm x 102 mm x 29 mm (with DIN rail bracket)

COM Port Number can be changed to COM1 to COM4 to support HyperTerminal,

or any other COM port number required

Supports Windows XP, 2003, 2000, ME and 9x.

Full Details PDF File

User Guide

Important Technical Information:
  • Features & Specifications:
  • Easy plug-and-play installation
  • Installed as a standard COM port
  • Full modem control signals & data signals supported
  • Serial port speed up to 230,400 bps or 921,600 bps depending on the model.
  • 384 byte receive / 128 byte transmit buffering.
  • USB cable included
  • The USB-COM series items support Windows 98, ME, 2000, XP, Apple MAC OS8 or higher, 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
  • Linux, OpenBSD and FreeBSD support the adapters directly, so no driver is necessary.

  • USB 4COMi SI M USB to Quad RS 422 Adapter with Optical Isolation Surge Protection The USB 4COMi SI M USB to Optical isolated Quad RS 422
    usb serial adapter from $19.95 only at serial adapter source