kWh modbus to KNX convertion?

[ClausP]

Hello everyone.

I've been using this code to convert an int16 modbus to an float16 knx.

Code:

    {
      "address": 52,
      "datatype": "int16",
      "bus_datatype": "float16",
      "name": "Total import kWh",
      "value_multiplier": 0.1,
      "type": "register"
    },

it has been working flawless until the total kwh counter reached 3276.7 kwh.
Then it stopped working.
I prosume that the problem is that i run out of data in the 16 bit signed integer. 

Then I tried to change the datatype to int32 an the bus_datatype to 14 (4-byte floating point).
But still no succes. 
Any sugestions on what to do to get the propper readout in KNX? 

The last code I tried is copied from another modbus profile for a powermeter:

Code:

    {
      "address": 52,
      "read_count":20,
      "read_offset":2,
      "datatype": "float32",
      "bus_datatype": "14",
      "name": "Total import kWh",
      "value_multiplier": 0.1,
      "type": "register"
    },

The powermeter I use is a Carlo Gavazzi EM340.
Link to modbus manual: https://gavazzi.se/app/uploads/2020/11/e...340_cp.pdf