You need a cable wired as per the diagram HH posted. From a signal perspective it’s the same on any DIN4 socket.
SN2
Hicap
Left RCA inner to Ch1 pin
Right RCA inner to Ch2 pin
Both RCA outers connected to –ve (signal ground) pin
For your cable, don’t connect anything to the pin marked nc on the Hicap or +ve on the SN2. The SN2 DIN4 socket has a 24v output using this pin. On the Hicap DIN4 socket, the nc pin is not used (nc - not connected)