B&B Electronics Vlinx MESR9xx - Manual (Page 58)

9. Appendices Vlinx MESR9xx Modbus Gateway
Page 54 Manual Documentation Number MESR9xx-4508m
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MESR902T-x Serial Port Pinouts
Terminal RS-232 RS-422 RS-485
A RTS TXA(-) DATA-
B TD TXB(+) DATA+
C CTS RXA(-) ---
D RD RXB(+) ---
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.