DS_USB-COM422-PLUS1 Datasheet, PDF (12/23 Pages) List of Unclassifed Manufacturers – Future Technology Devices International Ltd

3 Connections
Document Reference No.: FT_000131
USB-COM422-PLUS1 Datasheet
Version 1.1
Clearance No.: FTDI# 94
3.1 External Connectors
3.1.1 USB
The USB-COM422-Plus1 is a downstream USB 2.0 Device. A standard USB Series “B” receptacle is
reference to USB-F-1001 to facilitate connection to an upstream USB Host or Hub.
Pin Number Pin Type Description
1
Power
VBUS = USB Power provided from upstream USB Host or Hub
2
Bidirectional D– = USB data signal, negative polarity
3
Bidirectional D+ = USB data signal, positive polarity
4
Ground
GND = USB signal ground
Shield
Case Ground Drain = typically connected to the host PC case
Table 3.1 USB "B" Receptacle Pin-Out
3.1.2 RS422
The RS422 port is configured as Data Terminal Equipment (DTE), with a 9-contact D-Sub Pin connector.
Pin assignments are according to TIA/EIA-422.
Pin Number Pin Type Description
1
Output
2
Output
3
Input
4
Input
5
Ground
6
Output
7
Output
8
Input
9
Input
Table 3.2 DE-9P RS422 Pin-Out
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
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