I’ve just joined the club.
I’ve successfully attached my Ademco Vista Alarm to my EZIO8SA opto isolated inputs. Ademco has a 4204 Relay Module that can be configured to monitor different aspects from your alarm. I use the 4 inputs to monitor away/stay activation and door open/motion. You have to configure what each of the the 4 relays monitor from you alarm keypad. Then connect the output of the relays to your opto isolated inputs. I’ve connected them using the non-isolated method and they seem to work.
If anyone knows a method of activating the stay mode of a typical alarm with some type of contact closure please let me know.