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9. Appendices Vlinx MESR9xx Modbus Gateway

Page 76 Manual Documentation Number MESR9xx-0712m

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MESR902T-x Serial Port Pinouts

Terminal

RS-232

Direction (RS-232)

RS-422

RS-485

RTS

Output

TDA (-)

Data A (-)

Output

TDB (+)

Data B (+)

CTS

Input

RDA (-)

---

Input

RDB (+)

---

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 MESR901 Specifiche Pagina 80