USB-COM422 Datasheet, PDF (2/24 Pages) List of Unclassifed Manufacturers – Future Technology Devices International Ltd

1 Introduction
Document Reference No.: FT_000135
USB-COM422-PLUS2 Datasheet
Version 1.2
Clearance No.: FTDI#103
1.1 Functional Description
The USB-COM422-PLUS2 is a USB to a dual interface RS422 level serial UART adaptor incorporating
FTDI’s FT2232H Hi-Speed USB2.0 (480Mb/s) to dual serial UART interface IC device. The FT2232H
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-PLUS2 is a USB to a dual-port RS422 adapter.
The integrated electronics of the USB-COM422-PLUS2 utilise the FTDI FT2232H 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-Plus2
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 10Mbps.
The USB-COM422-Plus2 module requires USB device drivers, available free from www.ftdichip.com, which
are used to make the USB-COM422-Plus2 appear as a Virtual COM Port (VCP). This allows existing serial
communications software, such as HyperTerminal, to exchange data through the USB-COM422-Plus2 to a
legacy RS422 peripheral device.
Copyright © 2010 Future Technology Devices International Limited
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