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I also have the same alarm panel (Ademco Vista 15-P) and was able to connect the inputs to my EZIO6I easily.

I just connected them in parallel to the zones exactly where the sensors were connected. It appears as though my end of line resistors are connected in series with the sensor. Don’t know if that’s how it’s supposed to be. So my connection is:

Zone Terminals (I don't remember + or -, but you have to match those up)
[***] [***]
| | |
| | |
resistor | |
| | | |
sensor ezio | |
| | | |
| | sensor ezio
| | | |

Wow that was fun to make. ūüôā

It works independently of the alarm panel and so far I have the motion detectors and door sensors working.

I haven’t figured out how to use the analog inputs yet and one of my inputs doesn’t work at all. This is already my second unit and based on other reviews I’m concerned about how reliable these are.