Modbus best practices for serial
| 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). |