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2.0 Connecting The Serial MODBUS Gateway

Hardware

This section contains details on how to connect the Serial

MODBUS Gateway (SMG) for testing and use.

The SMG has a communication select jumper. No Jumper

is RS-485, jumper on is RS-232C.

The SMG has a 5 wire connector already installed and

ready for connection. The table below shows the wire

mapping.

SMG 5-Wire Connector

Red:

4.5 – 36 VDC

Black:

Power ground

Orange:

RS-232C: TXD gateway’s transmitter data

connection. Connect the MODBUS master’s

receiver.

RS-485: D+ Non-inverting 485 transmitter/receiver.

White:

Signal ground, internally connected to power

ground.

Green:

RS-232C: RXD gateway’s receiver data connection.

Connect the MODBUS master’s transmitter.

RS-485: D- Inverting 485 transmitter/receiver.

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