Advantech BB-VESR9 Series, Руководство пользователя

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VESR9xx Serial Servers
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VESR922T
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 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.