So great news, everything works perfectly.
@Gianluca_Mignano
@kfournia
@Syntocinon
Whilst I still don’t know what model number I have, I stumbled across an italian forum where someone was trying to connect a Ring Doorbell and there is a person on there who replied. He said use Urmet 1130/1 and voila it worked straight away.
Open, Ring to Open etc all work.
PLC forum is where you want to ask your question.
Hopefully this helps someone else too.