I have a NovoPort (PDF) garage door opener and I want to control the door with an ESP32. One of the issues I am having is the warning for "Do not connect any current-carrying cables". In the photo below I have a emergency stop sensor connected which connects to I (24V) and has an input to H.
If the input has to be volt-free how is this emergency sensor working?
I want to provide a second impulse generator (12F, illustration 12b) but I'm unsure how to provide a volt-free input
Note: There is a few versions of this opener, but they all appear to have the same requirements.
Note: The connections on the left (K) go to the motor.