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USB-COMI PRO / USB-2COMI PRO USER’S MANUAL
16
5.4
RS-485 Full-Duplex 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
RS-485 full-duplex 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 full-duplex pinout for 5-pin terminal block connector