I successfully connected my garage door to pimatic with an intertechno cmr-500.
The garage door control has a potential-free contact which can be closed with the cmr-500.
The next challenge is to open the door with a telephone call for opening the door out of the car.
I figured to connect a relais to the analog port of my PBX (Fritzbox) to set a gpio of raspberry to low or high.
With a gpio contact/switch I could trigger the cmr-500.
The question is which relais I can use?
There is a solution, but it’s very expensive:
Does anyone has experience in this subject?