Black Box IC187C - Manual (Page 28)

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APPENDIX B: Connector Pinouts
B.2 RS-422/485
Table A-2. Pinout of Connector Set to RS-422/485
Abbreviation 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