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RS-422/485 SERIAL INTERFACE PLUS, 4-PORT
Appendix A: Connector Pin Assignments
Table A-1. DB9 Pin Assignments.
Signal Name Pin # Mode
GND Ground 5
TX+ Transmit Data Positive 4 Output
TX- Transmit Data Negative 3 Output
RTS+ Request to Send Positive 6 Output
RTS- Request to Send Negative 7 Output
RX+ Receive Data Positive 1 Input
RX- Receive Data Negative 2 Input
CTS+ Clear to Send Positive 9 Input
CTS- Clear to Send Negative 8 Input