Venetian blind switch, room temperature controller, light switch Busch Jaeger

Yes, that is clear so far. I meant more like if I have, for example, 10 switches downstairs on the ground floor, they all have to be connected to the central electronic blind control 2. I certainly can't just connect all 10 to the switch, can I?

Yes, in principle it is like that, as is usually done in the [UV]. I don't know exactly how my buddy did it with us.

Ok, thanks. Then I'll discuss that with the electrician. Now I'll start looking for where I can get the components cheaply.

Quickly, without eBay Classifieds or similar:

[*]Gira 0822 28 - €60.16 - 20x €1,203.20
[*]Gira 0398 00 - €54.53 - 22x €1,199.66
[*]Gira 1309 203 - €116.51 - 2x €187.52

Total: approx. €2,590. €400 cheaper than the Busch Jäger variant

After all

I also have only 13 roller shutters and practically got the attachments for the extensions for free.

I already found the 1000 euros for roller shutters quite steep - with just switches I wouldn't have even paid 200 euros...

We're getting closer to the matter. Well, it won't be cheap, that was clear to me. Let's see, maybe I'll still find a good address for the components.