FTDIChip DS-US232R-10 DATA SHEET
FTDI Ltd
DS_US232R-10(R-100)
USB to RS232 Adapter cable
Data Sheet
Document Reference No.: FT_000151
Version 1.0
Issue Date: 04-08-2009
The USB-RS232 adaptor cables are a family of communication devices from FTDI Ltd. This model,
US232R, provides a simple method of adapting legacy serial devices with RS232 interfaces to modern
USB ports by incorporating the FTDI FT232R bridge chip.
The US232R cable is available in two lengths 10cm (US232R-10) and 100cm (US232R-
100). Indicator LEDs provide status of Transmit (TX) and Receive (Rx)
Future Technology Devices International Limited (FTDI)
Unit1, 2 Seaward Place, Centurion Business Park, Glasgow G41 1HH United Kingdom
E-Mail (Support): support1@ftdichip.com Web: http://www.ftdichip.com
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 no warranty 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 the product 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 © 2009 Future Technology Devices International Limited
Tel.: +44 (0) 141 429 2777 Fax: + 44 (0) 141 429 2758
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USB TO RS232 ADAPTER CABLE Data
Version 1.0
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1 Introduction ................................................................................... 4
1.1 Functional Description .................................................................................. 4
1.2 Typical Applications ...................................................................................... 5
1.3 Driver Support .............................................................................................. 6
1.4 Block Diagram ............................................................................................... 7
1.4.1
Block description ....................................................................................... 7
1.5 Cable Features .............................................................................................. 8
1.6 Performance Figures ..................................................................................... 9
1.7 Ordering Information .................................................................................... 9
2 FT232R Key features .................................................................... 10
2.1.1
Integrated EEPROM ...................................................................................10
2.1.2
Pre-programmed EEPROM ..........................................................................10
2.1.3
Lower Operating and Suspend Current .........................................................10
2.1.4
Low USB Bandwidth Consumption ..............................................................10
2.1.5
UART Pin Signal Inversion .........................................................................10
2.1.6
FTDIChip-ID™ ..........................................................................................11
2.1.7
Improved EMI Performance .......................................................................11
2.1.8
Programmable Receive Buffer Timeout .........................................................11
2.1.9
Baud Rates ..............................................................................................11
3 Installation ................................................................................... 12
3.1 RS232 Connection Pin Out .......................................................................... 12
3.2 Device Driver Installation ........................................................................... 13
3.2.1
Microsoft Windows ....................................................................................13
3.2.2
Mac OS X, Linux, Windows CE ....................................................................16
Connections ....................................................................................... 17
3.3 External Connectors .................................................................................... 17
3.3.1
USB ........................................................................................................17
3.3.2
RS232 .....................................................................................................17
4 Electrical details ........................................................................... 18
4.1 USB ............................................................................................................. 18
4.2 RS232 ......................................................................................................... 18
5 Mechanical Details ........................................................................ 19
5.1 Module Mechanical Dimensions ................................................................... 19
6 Physical Environment Details ....................................................... 24
6.1 Operating .................................................................................................... 24
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7 Environmental Approvals & Declarations ...................................... 25
7.1 EMI Compatibility ........................................................................................ 25
7.2 Safety ......................................................................................................... 25
7.3 Environmental ............................................................................................. 25
7.4 Reliability .................................................................................................... 25
8 Troubleshooting ........................................................................... 26
8.1 Hardware .................................................................................................... 26
8.2 Device Driver .............................................................................................. 26
9 Contact Information ..................................................................... 27
Appendix A - List of Figures and Tables ............................................. 28
Appendix B - Revision History ............................................................ 29
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1 Introduction
1.1 Functional Description
The USB-RS232 adaptor cables are a family of communication devices. This model, US232R, provides a
simple method of adapting legacy serial devices with RS232 interfaces to modern USB ports.
Each US232R adapter contains a small internal electronic circuit board which utilises the FTDI FT232R,
mounted inside a rugged plastic enclosure capable of withstanding industrial temperature ranges. The
integrated electronics also include RS232 level shifters and TXD/RXD LEDs to provide a visual indication
of data traffic through the adapter.
The Cable incorporates a standard USB-A device connector for connection to an upstream host or hub
port. RS232-level signals, including modem handshake signals, are available on an industry-standard
DE-9P connector. The maximum RS232-level data rate is 1MBaud.
The US232R adapter cable requires USB device drivers, available free from FTDI, which are used to make
the US232R appear as a Virtual COM Port (VCP). This allows existing serial communications software,
such as HyperTerminal, to exchange data through the US232R to a legacy RS232 peripheral device.
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1.2 Typical Applications
• USB to RS232 Converter
• Upgrading Legacy Peripherals to USB
• USB Audio and Low Bandwidth Video data transfer
• PDA to USB data transfer
• USB Smart Card Readers
• USB Instrumentation
• USB Industrial Control
• USB MP3 Player Interface
• USB FLASH Card Reader / Writers
• Set Top Box PC - USB interface
• USB Digital Camera Interface
• USB Hardware Modems
• USB Wireless Modems
• USB Bar Code Readers
• USB Software / Hardware Encryption Dongles
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1.3 Driver Support
• Windows Vista x64
• Windows XP x64
• Windows Server 2003 x64
• Windows Vista
• Windows XP
• Windows Server 2003
• Windows 2000
• Windows ME
• Windows 98
• Linux
• Mac OS X
• Mac OS 9
• Mac OS 8
• Windows CE.NET (Version 4.2 and greater)
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The drivers listed above are all available to download for free from the FTDI website. Various 3rd Party
Drivers are also available for various other operating systems - see the FTDI website for details.
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1.4 Block Diagram
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Figure 1-1 Block diagram
1.4.1 Block description
USB A Connector
This connector provides the interface for connection to a USB Host or Hub port
Cable
The US232R cable is available in two lengths 10cm – Part number US232R-10
and 100cm - Part number US232R-100.
FTDI FT232R
The FTDI FT232R provides the USB-to-Serial conversion. Operating system device drivers are
required in order to work with the FT232R to provide the Virtual COM Port serial functionality.
RS232 Level Shifter
The RS232 level shifter converts the signals provided by the FT232R into the voltage levels
required by RS232 devices.
DE-9P Connector (Male)
The DE-9P connector is configured in an industry standard (TIA/EIA-574) pin-out to provide
connection to RS232 peripherals through standard cables. See section 3.3.2
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DS_US232R-10(R-100)
USB TO RS232 ADAPTER CABLE Data
1.5 Cable Features
• Adds one RS-232 serial port by connecting to USB
• Special high gloss white finish enclosure design
• Side-lit blue RXD and TXD traffic indicators
• Enhanced RS232 transceiver gives serial port speed of up to 1MBaud.
• Gold plated USB and DB9 connectors for enhanced connection reliability
• Integral 10cm (US232R-10) or 100cm (US232R-100) USB cable with moulded strain relief
• Quality 4-layer PCB design
• Easy plug & play installation and RS-232 device connection
• Works with USB 1.1 & 2.0 Host and Hub ports
• Industry Standard FTDI chip set & device drivers for maximum compatibility
• Microsoft Windows® WHQL-certified, Mac OS X, Linux and Windows CE device drivers
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• Installs as a standard Windows COM port
• COM port number can be changed to any available COM port number, including COM1 to COM4,
to support HyperTerminal, or any other serial communications software application running in
Windows
• FIFO: 128 byte transmit buffer, 256 byte receive buffer
• RS-232 data signals: TxD, RxD, RTS, CTS, DSR, DTR, DCD, RI, GND
• Powered by USB port. No external power adapter required.
• Serial Communication Parameters
o Parity: None, Even, Odd
o Data bits: 7, 8
o Flow control: RTS/CTS , DSR/DTR, X-ON/X-OFF, None
o Stop bits 1,2
• Operating temperature of -20°C to +80°C
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1.6 Performance Figures
Parameter Performance
USB Interface 12Mbps USB 2.0 Full-Speed
Standard Windows baud rates (300bps to 921.6Kbps)
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RS232 Interface
Custom baud rates (300bps to 1Mbps) through baud rate aliasing. See
FTDI Application Note: Configuring FT232R, FT2232 and FT232BM Baud
Rates
Table 1.1 Performance Figures
1.7 Ordering Information
Part Number Description
US232R-10 USB-RS232 Adapter Cable – 10cm cable length
US232R-100 USB-RS232 Adapter Cable – 100cm cable length
Table 1.2 Ordering Information
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