Connection issues with digital intercom (2 wires bus system?)

Discussion
1

Hey guys, I tried already a lot but its not working.

I have a digital intercom
This is the model: https://www.eurosklep.de/Resource/Support/Manual/DT43_manual_de.pdf
and this is how it looks like on the backside:

C201F2ED-2259-4311-906C-6E1A6E841400
C201F2ED-2259-4311-906C-6E1A6E8414003024×4032 2.04 MB

the titles on the backside are:
L1
L2
and
NC, GND, RING, SW+ and SW-

this is not in the compatibility list of Nukis opener but I wanna try it anyway.

do you have any ideas how to connect the different cables?

thanks a lot in advance

2

OK, I tried nearly any possible wireconnection but nothing works.

So, before I return the Nuki stuff, I would like to know how to connect the Opener as “OTHER DOOR” to my intercom?

Can anybody please help me?