If you can't use the on-board relays on the Vista 20P you may need another way to indicate armed/disarmed status.
I added a 4229 expander board to the system and used the one relay on it to indicate armed/disarmed status. Because the relay has no voltage, you need to supply it. I used the Konnected board to supply it +5V.
The diagram is below. Hope that helps other folks.
ALso if you are using multiple zones with 4-wire smoke detectors the pins on the Vista20P may be used! You'll need an expander to make it work!
Hi Jon, so you connected also your smoke detectors?
Were you able to use Z1 with a resistor?