For PM5350 meter, to energize Digital output, you should use command code 6003; to de-energize digital
output, you should use command code 6002.

Here is an example for writing register to "De-energize Digital Output DO2" via using Modbus tester (or PMC Modbus).

Select Data Type: W16 (to write Multiple registers);

Select Starting Register: 5250;

Select # of Resister: 3;

Write: 405250 ->6002; 405251 ->0; 405252->2

Press "Write" button.

Please keep in mind that the command write must be done in a block write and it will not work if you write each register individually!