B&B Electronics VESR9xx - Fiber Models - Manual - Manual (Page 60)

Appendix D
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54
VESR902T & VESR922T SERIES
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
In the RS-422 mode, TX lines are outputs and RX lines are inputs. Connect the serial
server TXB(+) line to the RXB(+) line of the serial device, and the serial server TXA(-)
to the RXA(-) of the serial device.
Ground is signal ground and provides a common mode reference for the RS-422
Receiver and Transmitters.