Is there a module with which I can control something like this? If yes, which one? Or do you need three separate modules for that?
You can let several doorbell buttons operate separately per module. Only one line goes from the TFS universal plus. Therefore, you will need 1 module per Fritzbox.
just a little tip - anyone considering an Auerswald TFS can also take a look at Wantec.
The 4051 is not much more expensive, but looks way better than the Auerswald.
This was about the Auerswald TFS universal plus module. This is only the indoor unit "behind" the doorbell button and therefore invisible. The other Auerswald TFS units are indeed not beauties.
Thank you for your response HerrScheich This already helps me a lot. As far as the appearance is concerned, that is not a problem. The entire equipment is to be installed in a flush-mounted box
In addition to the above-mentioned, there is now also the TeleBell, with connection for a doorbell button or electronic gong, and control of the door opener via the telephone and optical indication of the doorbell signal.