7EN02-0390-03

Modbus best practices for serial

In order for your meter to operate as a serial Modbus device, you must complete some prerequisite configuration.
Prerequisite Description
Wiring

The device’s serial connection must be wired correctly.

The Modbus slave devices must have communications wiring to the Modbus master.

Protocol

Slave: for your meter to be a serial Modbus slave, the meter’s protocol must be set to Modbus RTU. Master and slave devices must use the same format.

Master: for your meter to be a serial Modbus master, the meter’s protocol must be set to Modbus Master.

Baud rate The baud rate must be the same for all devices on the serial Modbus network.
Stop bits and parity

The communication stop bits and parity (for example, 8N1) must be the same for all devices on the serial Modbus network.

Unit ID

Each device on the serial Modbus network must have a unique unit ID (also called the device address).

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