Future Technology Devices International Ltd USB-COM485-PLUS1 Datasheet Document Reference No.: FT 000132 Version 1.21 Issue Date: 2010-10-06 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 000132 USB-COM485-PLUS1 Datasheet Version 1.21 Clearance No.: FTDI 95 1 Introduction 1.1 Functional Description The USB-COM-Plus modules are a family of communication devices. This model, USB-COM485-Plus1, provides a simple method of adapting legacy serial devices with RS485 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-COM485-PLUS1 utilise the FTDI FT232R and includes RS485 level shifters plus TXD/RXD LEDs to provide a visual indication of data traffic through the module. Figure 1.1 USB-COM485-Plus1 The module uses a standard USB-B device connector for connection to an upstream host or hub port. RS485-level signals are available on an industry-standard DE-9P connector. The maximum RS485-level data rate is 3Mbps. Pin 9 of the DE-9P connector can provide +5V DC at 250mA. The USB-COM485-Plus1 module requires USB device drivers, available free from www.ftdichip.com, which are used to make the USB-COM485-Plus1 appear as a Virtual COM Port (VCP). This allows existing serial communications software, such as HyperTerminal, to exchange data through the USB-COM485-Plus1 to a legacy RS485 peripheral device. Copyright 2010 Future Technology Devices International Limited 1