Modbus - reported number incorrect

ESPHome
1

Hi,
not sure how to describe this. I have a heat pump which uses the following yaml to change the set temperature in the controller. The set point requires it to be x2 +60 to be sent to the heat pump for use.
This works great. But now the modbus number returned is always x2+60 instead of just returning back “x” on its own without the mathematics being applied to it.

Is there a way to alter this reported number being stored, ideally i need to divide by 2 and subtract 60 for it to report the correct figure. If i set it to 60 deg, the reported figure back is always 180 instead of 60.

Thanks

number:
  - platform: modbus_controller
    modbus_controller_id: device_addr_1
    name: "Set Target Temperature"
    id: set_target_temp
    register_type: holding
    address: 1104
    value_type: U_WORD
    mode: BOX
    skip_updates: 0
    min_value: 10
    max_value: 60
    step: 1
    write_lambda: |-
      return (x*2) + 60;
2

So if you set the number 60, your request would be 60x2+60=180.
What doesn’t match here?

4

Correct. But I’d like the return value from ESPhome to be 60. not 180, essentially have the calculation take part without the user even knowing it.

5

Try with lambda

lambda: |-
  return (x - 60) / 2;
write_lambda: |-
  return (x*2) + 60;
1 Like
6

Thanks I knew I was close with the lambda stuff. I just didnt know where to go. Fixed!

7

You’re welcome!