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Appendix B: Connector Pinouts

Appendix B. Connector Pinouts

B.1 DB9 M Connector

Figure B-1. DB9 M connector.
Table B-1. DB9 M connector pinout.
DB9 M Pin RS-232 Direction (RS-232) RS- 422/485 4 -Wire RS-485 2-Wire
1DCD Input RDA (-) —
2RD Input RDB (+) —
3TD Output TDB (+) Data B (+)
4DTR Output TDA (-) Data A (-)
5GND —GND GND
6DSR Input — —
7 RTS Output — —
8CTS Input — —
9 — — — —

B.2 Terminal Block

Figure B-2. Terminal block connector.
Table B-2. Terminal block connector pinout.
Terminal RS-232 Direction (RS-232) RS-422 RS- 485
A RTS Output TDA (-) Data A (-)
BTD Output TDB (+) Data B (+)
CCTS Input RDA (-) —
DRD Input RDB (+) —
EGND —GND GND