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724-746-5500 | blackbox.com
724-746-5500 | blackbox.com
Page 55
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
1 DCD Input RDA (-) —
2 RD Input RDB (+) —
3 TD Output TDB (+) Data B (+)
4 DTR Output TDA (-) Data A (-)
5 GND — GND GND
6 DSR Input — —
7 RTS Output — —
8 CTS 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 (-)
B TD Output TDB (+) Data B (+)
C CTS Input RDA (-) —
D RD Input RDB (+) —
E GND — GND GND