As part of the smart home, energy meters play important role in evaluation and checking of system efficacy.

I coded the small executable file being able to modify ID of energy meter DDS661 with RS485 bus available. In that way I can have more than one meter on the same bus and just 2 wires are needed for data transfer from all of them.

The protocol used is ModBus RTU, therefore adequate CRC calculations during transmission and reception were used.

The DDS661 are available at AliExpress. Select -RS485 variant with adequate voltage, please.

At the following link, you can download executable file: DDS661_ModBus_RTU.exe

I tested utility successfully, and it works as expected.