Future Technology Devices International Ltd
USB-COM485-PLUS2
Datasheet
Document Reference No.: FT_000136
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_000136
USB-COM485-PLUS2 Datasheet
Version 1.2
Clearance No.: FTDI#104
1
Introduction
1.1
Functional Description
The USB-COM485-PLUS2 is a USB to a dual interface RS485 level serial UART adaptor incorporating
FTDI’s FT2232H Hi-Speed USB2.0 (480Mb/s) to dual serial UART interface IC device. The FT2232H
handles all the USB signaling and protocols. The adaptor provides a fast, simple way to connect devices
with an RS485 interface to USB.
USB-COM485-PLUS2 is a USB to a dual-port RS485 adapter.
The integrated electronics of the USB-COM485-PLUS2 utilise the FTDI FT2232H 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-PLUS2
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 10Mbps.
The USB-COM485-PLUS2 module requires USB device drivers, available free from
www.ftdichip.com,
which are used to make the USB-COM485-PLUS2 appear as a Virtual COM Port (VCP). This allows existing
serial communications software, such as HyperTerminal, to exchange data through the USB-COM485-
PLUS2 to a legacy RS485 peripheral device.
Copyright © 2010 Future Technology Devices International Limited
1
Document Reference No.: FT_000136
USB-COM485-PLUS2 Datasheet
Version 1.2
Clearance No.: FTDI#104
1.2
LED Description
The USB-COM485-PLUS2 uses three LEDs to indicate a valid link as well as data traffic according to the
following table:
LED Colour
Yellow x 1
Function
Power
Description
ON when USB-COM485-PLUS2 is configured and ready
Red x 2
TxD Activity
Flashes when data is transmitted from the USB-COM485-PLUS2 to the
attached RS485 device
Flashes when data is transmitted from the attached RS485 device to the
USB-COM485-PLUS2
Green x 2
RxD Activity
Table 1.1 – LED Description
1.3
Block Diagram
RS485
Level Shifter
Channel A
USB B
Client
Connector
FTDI FT2232H
Hi-Speed USB Serial
Bridge
Channel B
RS485
Level Shifter
DE-9P
Connector
DE-9P
Connector
Figure 1.2 USB-COM485-PLUS2 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 FT2232H
FT2232H Hi-Speed USB2.0 (480Mb/s) is a dual serial UART interface IC device. Operating system device
drivers are required in order to work with the one to provide the Virtual COM Port serial functionality.
Dual RS485 Level Shifter
The RS485 level shifter converts the signals provided by the FT2232H into the voltage levels required by
RS485 devices.
DE-9P Connector (Male)
The DE-9P connector is configured in an industry standard (TIA/EIA-574) 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_000136
USB-COM485-PLUS2 Datasheet
Version 1.2
Clearance No.: FTDI#104
1.4
Features
Adds dual RS-485 serial port by connecting to a USB 2.0 Hi-Speed interface.
Easy plug & play installation and RS-485 device connection
Operates 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, Windows CE, Linux, Mac OS X
FIFO: 4K byte transmit buffer, 4K byte receive buffer
RS-485 data signals: Data+, Data-, GND
Powered by USB port. No external power adapter required. +5V output available.
Serial port speed up to 10Mbps
Serial Communication Parameters
o
o
o
Parity: None, Even, Odd
Data bits: 7, 8
Flow control: X-ON/X-OFF, None
Two DE-9P male connector
LEDs indicate USB Enumeration, RxD, TxD for monitoring port status & easy diagnostics
Operating temperature of -40°C to +85°C
Echo and non-Echo two modes can be selected.
1.5
Performance Figures
Parameter
Performance
USB Interface
480Mbps USB 2.0 Hi-Speed
Standard Windows baud rates (300bps to 921.6Kbps)
RS485 Interface
Custom baud rates (300bps to 10Mbps) through baud rate aliasing.
See FTDI Application Note:
Configuring FT232R, FT2232 and FT232BM
Baud Rates
Max Cable Length
USB = 5m, RS485 =12m (at 10Mbps)
Table 1.2 - Performance Figures
Part Number
USB-COM485-PLUS2
Description
USB-COM-Plus Hi-Speed USB to dual-Port RS485 module
Table 1.3 - Ordering Information
Copyright © 2010 Future Technology Devices International Limited
3
Document Reference No.: FT_000136
USB-COM485-PLUS2 Datasheet
Version 1.2
Clearance No.: FTDI#104
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 ................................................................... 11
Device Driver Installation ............................................................................. 7
2.1.1
2.2.1
2.2.2
3
Connections .................................................................................. 12
3.1
External Connectors .................................................................................... 12
USB ....................................................................................................... 12
RS485 .................................................................................................... 13
3.1.1
3.1.2
4
Electrical details ........................................................................... 14
4.1
4.2
4.3
USB ............................................................................................................. 14
RS485 ......................................................................................................... 14
Power Output .............................................................................................. 14
5
6
Mechanical Details ........................................................................ 15
5.1
Module Mechanical Dimensions ................................................................... 15
Physical Environment Details ....................................................... 16
6.1
6.2
Storage ....................................................................................................... 16
Operating .................................................................................................... 16
7
Environmental Approvals & Declarations ...................................... 17
7.1
7.2
7.3
7.4
7.5
EMI Compatibility ........................................................................................ 17
Safety.......................................................................................................... 17
Environmental ............................................................................................. 17
Reliability .................................................................................................... 17
MTTF ..................................................................................................... 17
Import / Export Information ....................................................................... 18
7.4.1
8
Troubleshooting ........................................................................... 19
8.1
8.2
Hardware .................................................................................................... 19
Device Driver .............................................................................................. 19
9
Contact Information ..................................................................... 20
Copyright © 2010 Future Technology Devices International Limited
4
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