Copyright © 2010 Future Technology Devices International Limited

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Document Reference No.: FT_000132

USB-COM485-PLUS1 Datasheet

Version 1.21

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

Parity: None, Even, Odd

o

Data bits: 7, 8

o

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

RS485 Interface

Standard baud rates (300bps to 921.6Kbps)

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 =1200m

Table 1.2 Performance Figures

Part Number

Description

USB-COM485-Plus1

USB-COM-Plus Full-Speed USB to 1-Port RS485 module

Table 1.3 Ordering Information