I’m working on a project to remote control and monitor my “ancient” home alarm system using ST. It’s a late 90’s Ademco FA110C system, designed to dial out on a hard line. No remote control capabilities (except for a hardwired physical keyswitch arm/disarm option), no web or smart capabilities. I priced out replacing it with a Vista 20P system…the panel itself is relatively cheap, but after adding 3 keypads to replace the current 3 in the house, and getting an Envisalink to complete the communication piece, I’d be looking at around $400 to go this route.
I think I have figured out how to arm and disarm remotely using a GoControl relay module to simulate the alarm’s keyswitch option. I also think I can use an external-input-capable contact sensor with a 12v relay to send a signal if the siren activates. Simple enough, and probably looking at a cost of $60-70 instead of $400.
I’d like to take things one step further and find a way to turn each of the 6 zones into ST devices so I can see the state of each zone, and also possibly measure frequencies of a signal across a couple terminals to determine if the alarm is Armed/Ready/Not Ready. Is there a single device out there that can do something like this? I could add 6 separate contact sensors, but then I’m starting to get closer to the cost of replacing the whole thing, which pretty much defeats the purpose.