USB to Serial Converters Manual
Version 2.0
Document Reference No.: CP_000032 Clearance No.: CP#022
Copyright © Connective Peripherals Pte Ltd
35
6.2
RS-422
Signal Pin-
out
DB-9 Male connector
The table below shows the RS-422 pin-out of the DB-9 Male connector
Pin Number
Pin Type
Description
1
Output
TxD- = Transmit data, negative polarity
2
Output
TxD+ = Transmit data, positive polarity
3
Input
RxD+ = Receive data, positive polarity
4
Input
RxD- = Receive data, negative polarity
5
Ground
GND = Signal ground
6
Output
RTS- = Request to send, negative polarity
7
Output
RTS+ = Request to send, positive polarity
8
Input
CTS+ = Clear to send , positive polarity
9
Input
CTS- = Clear to send, negative polarity
Shield
Case Ground Drain = typically connected to the host PC case
Table 14 - RS-422 Pin-Out for DB-9 Connector
5-way Terminal Block
The table below shows the RS-422 pin-out of the 5 way terminal block (only available on some models).
Pin Number
Pin Type
Description
1
Output
TxD- = Transmit data, negative polarity
2
Output
TxD+ = Transmit data, positive polarity
3
Input
RxD+ = Receive data, positive polarity
4
Input
RxD- = Receive data, negative polarity
5
Ground
GND = Signal ground
Table 15 - RS-422 Pin-Out for 5-way Terminal Block
