The button must always be pressed twice to obtain the correct command
When using the US/U x.2 with the parameterized TOGGLE function, it sometimes might be necessary to press the connected button twice to ensure the desired function. If a function is realized from several areas with a TOGGLE function, the “S-Flag” must absolutely be set in the object (channel) of the US/U. The other switching areas thereby synchronize or hear which value was just sent. A central address or the status of the switching channel can be included as a second address.
Tags: KNX, Switching