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gonzojive / heatpump

Tools for communicating with the Chiltrix CX34 heat pump using a Raspberry Pi
Apache License 2.0
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Issue connecting to fancoil #26

Closed njmckenzie closed 1 year ago

njmckenzie commented 1 year ago

I am having a persistent problem getting the modbus settings to correctly communicate with the fancoils. I have verified that each fancoil has the ZLFP10 board. I have set the modbus settings per the 'fancoil.go' file and can connect to the fan coil but keep getting errors when I try to read register values. I have used multiple different modbus softwares and get the same two errors in each response:

  1. "Response not from the requested slave" (the response has slave address 0)
  2. Exception Code 2 error - invalid data address.

Is there a switch/setting on the fan coils that needs to be turned on to allow RS485 comms? If not, do you have any other ideas on possible problems? I was/am able to connect to the CX34 without issue.

Modbus settings

njmckenzie commented 1 year ago

Solved the problem. Needed to use 28301 as my starting address per "https://github.com/gonzojive/heatpump/blob/main/fancoil/chiltrix-htp-fancoil-documentation.md"