15 bit UIN in config

[tgrosz]

Hi,
It seems that my Wolf boiler sends the target forward temperature in only 15 bits.
Details:

1. The config is UIN divided by 10, it gives valid data when the target temp is not zero
2. When the boiler is in DHW only mode, the zero value is also valid
3. When the boiler is in Heat+DHW mode, then the data I get is 3276.8
   So, it seems that the high bit is used for something else, maybe for Heat mode.
   Question:
   How can I modify the config, to use only 15 bits? I can do it on Home Assistant side, but it'd be better to have it on ebusd side.
   Thank you