B&B Electronics VESR9xx - Fiber Models - Manual - Manual (Page 59)

Appendix D
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53
VESR902D SERIES
DB-9M 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 A (-)
4 DTR Output TDA (-) Data B (+)
5 GND --- GND GND
6 DSR Input --- ---
7 RTS Output --- ---
8 CTS Input --- ---
9 RI Input --- ---