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
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
Full Details PDF File
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.