Hi everyone,
I’m integrating a Eurotherm SmartComfort 365 underfloor heating system (using SmartOne365 wall controllers) into Home Assistant via Modbus TCP.
I’ve successfully mapped the documented registers from the Rev.06 protocol, including:
- Floor temperature
- Humidity
- Dew point
- Target temperature
- Manual setpoint
- Mode
- Flow temperature
- Flow setpoint
These are all working correctly in Home Assistant.
The one thing I can’t find is a register (or status bit) indicating that a zone is actively calling for heat (i.e. equivalent to the heating/flame icon shown on the SmartOne365 controller).
I’ve already:
- Compared documented and undocumented registers.
- Scanned a number of undocumented register ranges.
- Confirmed the system is definitely heating while testing.
- Identified that some undocumented registers change continuously, but none appear to be a simple heating-demand flag.
Has anyone:
- Found a Modbus register or bit indicating heating demand, relay output, valve open, heat request, or similar?
- Reverse engineered additional SmartComfort 365 registers beyond the published documentation?
- Integrated one of these systems into Home Assistant?
I’d be very interested in any undocumented register maps or even observations about which registers change during a heating cycle.
Thanks!