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Future Technology Devices International Ltd

USB to RS485 Serial Converter Cable

Document Reference No.: FT_000117 Version 1.4 Issue Date: 2010-05-27

Future Technology Devices International Limited (FTDI) Unit1, 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.comWeb: Copyright © 2010 Future Technology Devices International Limited

Neither the whole nor any part of the information contained in, or the product described in this manual, may be adapted or reproduced in any material or electronic form without the prior written consent of the copyright holder. This product and its documentation are supplied on an as-is basis and nowarranty as to their suitability for any particular purpose is either made or implied. Future Technology Devices International Ltd will not accept any claim for damages howsoever arising as a result of use or failure of this product. Your statutory rights are not affected. This product or any variant of it is not intended for use in any medical appliance, device or system in which the failure of theproduct might reasonably be expected to result in personal injury. This document provides preliminary information that may be subject to change without notice. No freedom to use patents or other intellectual property rights is implied by the publication of this document. Future Technology Devices International Ltd, Unit1, 2 Seaward Place, Centurion Business Park, Glasgow, G41 1HH, United Kingdom.Scotland Registered Number: SC136640

Copyright © 2010 Future Technology Devices International Limited

Document Reference No.: FT_000117 USB TO RS485 SERIAL CONVERTER CABLE Datasheet

Version 1.4

Clearance No.: FTDI #75



The USB-RS485 cable is a USB to RS485 levels serial UART converter cable incorporating FTDI‟s FT232RQ USB to serial UART interface IC devicewhich handles all the USB signalling and protocols. The cable provides a fast, simple way to connect devices with a RS485 interface to USB. Each USB-RS485 cable contains a small internal electronic circuit board, utilising the FT232R, which is encapsulated into the USB connector end of the cable. The FT232R datasheet, DS_FT232R, is available at The integrated electronics alsoinclude the RS485 transceiver plus Tx and Rx LEDs which give a visual indication of traffic on the cable (if transparent USB connector specified). The other end of the cable is bare, tinned wire ended connections by default, but can be customised using different connectors to support various applications. The USB-RS485 cable is designed for use at the end of an RS485 network up to approximately10m. For longer networks or placement of the USB-RS485 cable in the middle of an RS485 network it is recommended that the attached wire is cut to 20cm or less to ensure signal integrity Cables are FCC, CE, RoHS compliant. The cable is USB powered and USB 2.0 full speed compatible. Each cable is 1.8m long and supports a data transfer rate up to 3 Mbaud. Each cable supports the FTDIChip-ID™, with aunique USB serial number programmed into the FT232R. This feature can be used to create a security or password protected file transfer access using the cable. Further information and examples on this feature are available at under FTDIChip-ID Projects. The USB-RS485 cables require USB drivers, available free from, which are used to make the FT232R inthe cable appear as a virtual COM port (VCP). This then allows the user to communicate with the USB interface via a standard PC serial emulation port (for example TTY). Another FTDI USB driver, the D2XX driver, can also be used with application software to directly access the FT232R on the cable though a DLL. This is illustrated in the Figure 1.1

Various Connector Options
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