Perhaps this can help.
The Acet 702 is a 1+n (2wire) analog system.
n = neutral = 0 V
The other wire is some sort of a bus. It is for audio, ring, opening the door.
The connector 5 is for the n wire (the yellow wire in my case)
the connector 6 is for the bus (the blue wire in my case)
How to connect the Nuki Opener ?
In the Nuki app select a 2 wire analog device to know the connection diagram.
In any case you must connect :
- the neutral opener wire to the connector 5
- the bus opener wire to the connector 6.