How do you connect a GSM module to control a garage door?

Hello

I have a GSM module (CLIP- and SMS-controlled) which has a transistor output that can control the power supply ground up to 100mA. I would like to connect a CLIP-controlled garage door opener at home to this output. As far as the programming is concerned, I’ve got that sorted, but the wiring diagram is a bit of a headache. I have a wall-mounted button for opening and closing the door. What connection diagram should I use so that I can control the garage door opening via my phone? Do I need a relay or a fuse, or should I simply connect a cable directly from the output to the door controller?

A relay connected in parallel with the existing wall-mounted button.

Could you explain which relay to use (would a standard 12V one do?) and how to make the connection, and whether to omit the fuse?

And what is the voltage at that output on the GSM module?

The output controls the ground, so it’s 0V, but the voltage is 12V.

If I’m thinking correctly, I connect the relay like this:
coil: +12V and the signal from the output (-)
Once the output is triggered, the relay switches from NO to NC.
On one side, I connect the cable from the gate opener controller, but what about the other side?
I’m not sure if I’ve explained this correctly.

Almost right – you’ve got the power supply side sorted; on the other side of the relay, you break the circuit in the same way as the button does. So, you connect a 0.5 mm² two-core cable to the same terminals on the gate control unit, specifically to the COM and NO terminals on the relay.

So, apart from the power connection being correct, the relay is the opposite of what I thought. Thanks for your interest and the tip.
And what kind of relay should I use, and perhaps a fuse, to make sure it all works as it should, because I’m afraid I’ve no idea.

For example this and stand . A fuse is not necessary.

Thank you very much for your help. I think the issue has been resolved and can be closed.