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USB-COMI PRO / USB-2COMI PRO USER’S MANUAL
15
5.3
RS-422 Mode Pinout
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
RS-422 pinout for DB-9 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
RS-422 pinout for 5-pin terminal block connector