Mode without the need to open chassis

Requiring power

(with Optical Isolation & Surge Protection)

The USB-COMi-SI-M USB-to-Optical isolated 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 a RS-422, or RS-485

serial communication port 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 port dont

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

is powered by the USB port, and no external power adapter is required.

The adapter is designed with an external 4-pin dip switch to set RS-422 or RS-485

mode conveniently, without the need to open the metal chassis. Both a 6-pin

terminal block and a DB9 male connector are available for optimal flexibility for

serial connection. The adapter also provides a unique feature of supplying power

output of 5V/150mA through pin-5 of the terminal block to serial device. 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.

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

power surges up to 25KV ESD.

The USB-to-RS-422/485 Adapter provides instant connectivity to 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-COMi-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.: USB-COMi-SI-M

Adds one RS-422, or RS-485 serial port

by connecting to USB port

Installed as standard Windows COM

port

2000V DC optical isolation protection

25KV ESD surge protection

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+

FIFO: 128 byte transmit buffer

384 byte receive buffer

Serial port speed up to 230K bps

One DB9 male connector & one 6-pin terminal block

Supplies power output of 5V/150mA through pin-5 of terminal block for serial

devices requiring power.

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

One external dip switch for easy RS-422, 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

Powered by USB port. No external power adapter required.

Easy plug & play installation and RS-232/RS-422/RS-485 device connection

Works with USB 1.1 & 2.0 host port

SECC sheet metal chassis with DIN rail bracket

Dimensions: 57mm x 76mm x 23mm

82mm x 76mm x 23mm (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

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 http://www.ftdichip.com/Drivers/FT232-FT245Drivers.htm. Linux, OpenBSD and FreeBSD support the adapters directly, so no driver is necessary.

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