Energy monitor/ 3-Phase Power / Modbus Profile EMU Professional 3/5 TCP/IP

[admin]

You need to set datatype, not bus_datatype. bus_datatype is needed only when it's different from the main datatype.
Try this for active energy register:

Code:

{ "name": "active energy", "datatype": "int64", "type": "register", "address": 4201 }