Interfacing with PEHA

Hello

I have an old (10 years) Comlux automation system, which has been out of support for years. I’m preparing for what happens when i breaks down, where I would like to be able to replace it with an open source controller.

I have so far found out that Comlux is a derivative of the german PEHA system. And I can see that openHAB users apparently interface to PEHA.

So my question is, how do You do that. What hardware and cables do You need. And what protocol do You use?

Hope to get some valuable tips on this.

Regards Kjeld