Future Technology Devices International Ltd
USB-COM485-PLUS1
Datasheet
Document Reference No.: FT_000132
Version 1.2
Issue Date: 2010-04-12
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: 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 © 2010 Future Technology Devices International Limited
Document Reference No.: FT_000132
USB-COM485-PLUS1 Datasheet
Version 1.2
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
Document Reference No.: FT_000132
USB-COM485-PLUS1 Datasheet
Version 1.2
Clearance No.: FTDI# 95
1.2
LED Description
The USB-COM485-Plus1 uses three LEDs to indicate a valid link as well as data traffic according to the
following table:
LED Color
Yellow
Function
Enumerated
Description
ON when USB-COM485-Plus1 is configured and ready
Green
TxD Activity
Flashes when data is transmitted from the USB-COM485-Plus1 to the
attached RS485 device
Flashes when data is transmitted from the attached RS485 device to the
USB-COM485-Plus1
Red
RxD Activity
Table 1.1 LED Description
1.3
Block Diagram
USB B
Client
Connector
FTDI FT232R
USB Serial Bridge
RS485
Level Shifter
DE-9P
Connector
Figure 1.2 USB-COM485-Plus1 Block Diagram
1.3.1 Block description
USB B Client Connector
This connector provides the interface for connection to a USB Host or Hub port. The maximum cable
length is 5 meters, according to the USB 2.0 specification.
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.
RS485 Level Shifter
The RS485 level shifter converts the signals provided by the FT232R into the voltage levels required by
RS485 devices.
DE-9P Connector (Male)
The DE-9P connector is configured in an industry standard (TIA/EIA-485) pin-out to provide connection to
RS485 peripherals through standard cables. See section 3.1.2
Copyright © 2010 Future Technology Devices International Limited
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Document Reference No.: FT_000132
USB-COM485-PLUS1 Datasheet
Version 1.2
Clearance No.: FTDI# 95
1.4
Features
Adds one RS-485 serial port by connecting to USB
Easy plug & play installation and RS-485 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
Installs as a standard Windows COM port
COM port number can be changed to any available COM port number, to support HyperTerminal,
or any other serial communications software application running in Windows
Supports Windows Server 2008, 2003, Vista, XP, 2000, Linux, Mac OS X
FIFO: 128 byte transmit buffer, 256 byte receive buffer
RS-485 data signals: Data+, Data-, GND
Option to enable or disable local echo
Powered by USB port. No external power adapter required.
Pin 9 of DE-9P can provide +5VDC output at 250mA.
Serial port speed up to 3Mbps
Serial Communication Parameters
o
o
o
Parity: None, Even, Odd
Data bits: 7, 8
Flow control: None
One DE-9P male connector
LEDs indicate USB Enumeration, RxD, TxD for monitoring port status & easy diagnostics
Operating temperature of -40°C to +85°C
1.5
Performance Figures
Parameter
Performance
USB Interface
12Mbps USB 2.0 Full-Speed
Standard baud rates (300bps to 921.6Kbps)
RS485 Interface
Custom baud rates (300bps to 3Mbps) through baud rate aliasing. See
FTDI Application Note:
Configuring FT232R, FT2232 and FT232BM Baud
Rates
Max Cable Length
USB = 5m, RS485 =12m
Table 1.2 Performance Figures
Part Number
USB-COM485-Plus1
Description
USB-COM-Plus Full-Speed USB to 1-Port RS485 module
Table 1.3 Ordering Information
Copyright © 2010 Future Technology Devices International Limited
3
Document Reference No.: FT_000132
USB-COM485-PLUS1 Datasheet
Version 1.2
Clearance No.: FTDI# 95
1
Introduction ................................................................................... 1
1.1
1.2
1.3
1.4
1.5
Functional Description .................................................................................. 1
LED Description ............................................................................................. 2
Block Diagram ............................................................................................... 2
Block description ....................................................................................... 2
Features ........................................................................................................ 3
Performance Figures ..................................................................................... 3
1.3.1
2
Installation ..................................................................................... 6
2.1
2.2
Example Applications and Configurations ..................................................... 6
Wiring ...................................................................................................... 6
Microsoft Windows ..................................................................................... 7
Mac OS X, Linux, Windows CE ................................................................... 10
Device Driver Installation ............................................................................. 7
2.1.1
2.2.1
2.2.2
2.3
Local Echo ................................................................................................... 10
3
Connections .................................................................................. 11
3.1
External Connectors .................................................................................... 11
USB ....................................................................................................... 11
RS485 .................................................................................................... 11
3.1.1
3.1.2
4
Electrical details ........................................................................... 12
4.1
4.2
4.3
USB ............................................................................................................. 12
RS485 ......................................................................................................... 12
Power Output .............................................................................................. 13
5
6
Mechanical Details ........................................................................ 14
5.1
Module Mechanical Dimensions ................................................................... 14
Physical Environment Details ....................................................... 15
6.1
6.2
Storage ....................................................................................................... 15
Operating .................................................................................................... 15
7
Environmental Approvals & Declarations ...................................... 16
7.1
7.2
7.3
7.4
7.5
EMI Compatibility ........................................................................................ 16
Safety.......................................................................................................... 16
Environmental ............................................................................................. 16
Reliability .................................................................................................... 16
MTTF ..................................................................................................... 16
Import / Export Information ....................................................................... 17
7.4.1
8
Troubleshooting ........................................................................... 18
8.1
8.2
Hardware .................................................................................................... 18
Device Driver .............................................................................................. 18
Copyright © 2010 Future Technology Devices International Limited
4
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