Copyright © 2010 Future Technology Devices International Limited

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Document Reference No.: FT_000131

USB-COM422-PLUS1 Datasheet

Version 1.1

Clearance No.: FTDI# 94

1 Introduction

The USB-COM-Plus modules are a family of communication devices. This model, USB-COM422-Plus1,

provides a simple method of adapting legacy serial devices with RS422 interfaces to modern USB ports.

This is accomplished by incorporating the industry standard FTDI FT232R USB-Serial bridge chip.

The integrated electronics of the USB-COM422-PLUS1 utilise the FTDI FT232R and includes RS422 level

shifters plus TXD/RXD LEDs to provide a visual indication of data traffic through the module.

Figure 1.1 USB-COM422-Plus1

The module uses a standard USB-B device connector for connection to an upstream host or hub port.

RS422-level signals, including modem handshake signals, are available on an industry-standard DE-9P

connector. The maximum RS422-level data rate is 3Mbps.

The USB-COM422-Plus1 module requires USB device drivers, available free from www.ftdichip.com, which

are used to make the USB-COM422-Plus1 appear as a Virtual COM Port (VCP). This allows existing serial

communications software, such as HyperTerminal, to exchange data through the USB-COM422-Plus1 to a

legacy RS422 peripheral device.