B&B Electronics MESP211D_T - Manual - Manual (Page 68)

Appendices Vlinx MESP211 Modbus Gateway
67
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MESP211 TERMINAL BLOCK PINOUTS
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 Modbus
Gateway TXB(+) line to the RXB(+) line of the Modbus network, and the Modbus Gateway
TXA(-) to the RXA(-) of the Modbus network.
Ground is signal ground and provides a common mode reference for the RS-422 Receiver
and Transmitters.