USB-COM422-PLUS1 FTDI, USB-COM422-PLUS1 Datasheet - Page 7

• Manufacturer Part Number: USB-COM422-PLUS1
• Description: Interface Modules & Development Tools USB to RS422 Convrtr Assembly 1 DB9 Port
• Manufacturer: FTDI

Specifications of USB-COM422-PLUS1

• Interface Type: USB, RS-422
• Data Bus Width: Serial
• Operating Supply Voltage: 5 V
• Product: Interface Modules
• For Use With/related Products: FT232R
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: USB-COM422-PLUS-1

2
2.1
2.1.1 Wiring
Insert the A-plug into an available USB Host or Hub port. Insert the B-plug into the B-receptacle on the
USB-COM422-Plus1.
The USB-COM422-Plus1 follows EIA-422 standard as a Data Terminal Equipment (DTE) device. If the
RS422 equipment being connected is a Data Communication Equipment (DCE) device, it’s typical that a
straight-through cable can be used.
Table 2.1 RS422 DTE to DCE connection with straight-through cable
Some serial devices may require certain handshake signals be connected. Refer to your device manual
for cabling details.
2.2
The USB-COM422-Plus1 module drivers are available for download from:
www.ftdichip.com
2.2.1 Microsoft Windows
With the device drivers being Windows Hardware Quality Labs (WHQL) certified, they are also available
through download directly from the Microsoft
DTE Pin Number
Installation
Example Applications and Configurations
Device Driver Installation
1
2
3
4
5
6
7
8
9
Signal Name
TXD- = Transmit Data,
negative polarity
TXD+ = Transmit Data,
positive polarity
RXD+ = Receive Data,
positive polarity
RXD- = Receive Data,
negative polarity
GND = signal ground
RTS- = Request To Send,
negative polarity
RTS+ = Request To Send,
positive polarity
CTS+ = Clear To Send,
positive polarity
CTS- = Clear To Send,
negative polarity
Copyright © 2010 Future Technology Devices International Limited
®
Windows
Expected Connect Signal
®
Update service. This is the best choice when
RXD+
TXD+
CTS+
RTS+
RXD-
TXD-
CTS-
RTS-
GND
Document Reference No.: FT_000131
USB-COM422-PLUS1 Datasheet
Clearance No.: FTDI# 94
Version 1.1
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