... You're correct: I used a connector for an optional radio module (maybe providing more range than the embedded one), if I remember correctly. Don't remember exactly which one, but this was the only 24V that was permanent even when the door was operating, checking with a multi-meter. I must have ...

.. This is where the Qubino dry contact module, that can be 24Vcc powered, is nice. Because control board usually makes possible to drive options that needs the open/close info (may be called "end of course" signal), like some added security sensors that needs to be powered only when the door is ...