Future Technology Devices International Ltd USB-COM422-PLUS4 Datasheet Document Reference No.: FT 000135 Version 1.0 Issue Date: 2009-09-14 Future Technology Devices International Ltd (FTDI) Unit 1, 2 Seaward Place, Centurion Business Park, Glasgow, G41 1HH, United Kingdom Tel.: +44 (0) 141 429 2777 Fax: + 44 (0) 141 429 2758 E-Mail (Support): support1 ftdichip.com Web: Document Reference No.: FT 000152 USB-COM422-PLUS4 Datasheet Version 1.0 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 FTDIs 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. Copyright 2009 Future Technology Devices International Limited 1