Product specifications

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.