2
Introduction
1 Overview
The VScom USB-COM are serial port adapters, which are connected to the USB port. The VScom
USB-COM PRO series are industrial strength devices, providing flexible serial ports. The ports
may operate in RS232, RS422 or RS485 mode. This is completely configured by software, no
jumpers or DIP switches are required. Further the USB-COM PRO come in a metal case of IP30,
and provide the option for DIN Rail mounting.
The supplied drivers for Windows operating system install the ports into the Windows API, so
they appear as the usual Com ports. All applications capable to handle a serial port control the
connected hardware the same way as they control the built-in ports Com1 and Com2. Similar
drivers exist for other operating systems.
The driver allows to configure the serial ports for a bitrate of up to 3 Mbps. Of course RS232 can
not reliably transport very high bitrates, even under best conditions 1 Mbit/s is the limit. As the
result of the very high maximum speed, the USB-COM will generate many different bitrates in
lower ranges. In fact every single bitrate from 185 bps up to 480000 bps is a possible transmission
speed. And above this range most bitrates up to 1 Mbit/s are also possible, e.g. 500000 bps.
The interface to the host PC is USB 2.0, Full Speed or High Speed where required.
2 Introduction
This manual describes the hardware of VScom USB-COM PRO serial port adapters. Also the
Windows driver for the USB-COM is described in detail.
2.1 Features
• USB 2.0
• Jumperless configuration
• Serial port interface RS232, RS422 or RS485, by software
• Termination and BIAS resistors for RS422 or RS485, by software
• Huge FIFO buffers 128 Byte
• Max 3.0 Mbit/s
• Drivers for Windows™ operating system
• Supported by Linux, Mac OS X, and Windows CE on several platforms.
June 2009
USB-COM PRO User Manual
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