Write Temperature Setpoint to Modbus as float32

Add-ons Bindings
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1

Hi!
openHAB 2.2.0 Release Build

I have a problem with the setpoint item an the modbus binding.

Modbus binding:
tcp.slave2.connection=192.168.178.12:502
tcp.slave2.id=1
tcp.slave2.start=12291
tcp.slave2.length=2
tcp.slave2.type=holding
tcp.slave2.valuetype=float32

Item:
Number Temperatur "Temperatur [%f °C]" (ALL) {modbus="slave2:2"}

Sitemap:
Setpoint item=Temperatur minValue=22 maxValue=30 step=0.2

If I adjust the setpoint (BasicUI or Android App), the modbus value is only updated, if there is change from intergers (e.g. 22°C to 23°C). The decimal changes are not write to the modbus slave. So I think, openHAB only write WORDS an not float32.

How can I force openHAB to write the setpoint as float32 to the modbus slave?

2

That is correct, for Modbus binding version 1.x. There is no way to write 32 bit floats.

You will have to move to binding version 2
You will have to change your modbus configuration a lot, adding new Things

1 Like
3

Thank you! I will give it a try.