Minimal two objects are involved:
- the switching object of a rocker (push button)
- the switching object of a relay (binary output)
Switching objects have a data length of 1 bit.
A KNX switching function only requires one Group Address. This Group Address links the switching object(s) of the rocker(s) with the switching object(s) of the relay(s).
A switching function can additionally have a status-feedback feature. This is a Group Address that links a status object (LED) of the rocker with the feedback object of the relay. Both the status object and the feedback object have a data length of 1 bit.