Copyright © 2010 Future Technology Devices International Limited

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Document Reference No.: FT_000152

USB-COM422-PLUS4 Datasheet

Version 1.1

Clearance No.: 107

1 Introduction

1.1 Functional Description

The USB-COM422-PLUS4 is a USB to a quad interface RS422 level serial UART adaptor incorporating

FTDI’s FT4232H Hi-Speed USB2.0 (480Mb/s) to quad serial UART interface IC device. The FT4232H

handles all the USB signaling and protocols. The adaptor provides a fast, simple way to connect devices

with an RS422 interface to USB.

USB-COM422-PLUS4 is a USB to a quad-port RS422 adapter.

The integrated electronics of the USB-COM422-PLUS4 utilise the FTDI FT4232H 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-PLUS4

The module uses a standard USB Mini 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 10Mbps.

The USB-COM422-PLUS4 module requires USB device drivers, available free from www.ftdichip.com,

which are used to make the USB-COM422-PLUS4 appear as four Virtual COM Ports (VCP). This allows

existing serial communications software, such as HyperTerminal, to exchange data through the USB-

COM422-PLUS4 to a legacy RS422 peripheral device.