Hi !
The recommended way would be to only use one entity. You can control it from Knx using an interface device trigger. And you can send back the status, if needed, with expose.
Otherwise use an automation coupling those two entities on state change, but imho that’s more error prone.
thanks a lot. I’ve use the automation coupling an its running great with binary DPT’s.
But what can i do to send a temperature value from KNX over the HA to the pool control? In KNX it’s an 2-byte DPT. I’ve find no solution for that in the automation menu.