Proel PC512 Intercom Handset Connection: Step-by-Step Guide to Replace Model 255 with Photos

Hi,
I am after a general renovation of the apartment, I also bought a new intercom receiver because the old one was already all yellow.

I bought a Proel PC512 handset, previously I had a handset from the same manufacturer only the 255 model.

Unfortunately, I do not know how to connect it, I was at the neighbor's to see and he also has six cables, only in different colors. Four are connected to the intercom, two remain loose as in the photo. The photo also shows my intercom with unconnected cables.

How should I connect my intercom?

I am a total layman so I will be grateful for your help.

Check which cables you have DC voltage on (plus and minus) and connect them to the new uniphone (according to polarity).
It is a pity that you did not write down which cables were connected to the old uniphone. Besides, the old one only needed to set the apartment number with jumpers. In the new one, it must be done programmatically (according to the instructions).

Ps. At the neighbor's, as you can see, the cables are doubled. Two "cold" colors together and two white colors together.

And this can also be the case with a friend. It's PC 512c programming to overcome There are even videos on YT.