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9. Appendices Vlinx MESR9xx Modbus Gateway

Page 56 Manual Documentation Number MESR9xx-0109m

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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.

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B&B Electronics ESR901 Specifiche Pagina 60