Okay, here's a new plugin: Cynical Honey uses the serial interface on a Honeywell (aka Ademco) security system to connect it to Indigo. It does what you'd expect an alarm system interface to do - you can arm and disarm partitions, look at the status of zone sensors, type into keypads, and such. As usual, the documentation is the web page: http://www.cynic.org/indigo/plugins/online/honey.html; you can get there by clicking the little question-mark buttons in dialogs; and you can download the plugin right from that web page.
Cynical Honey has robust support for multiple partitions (I've got three in my house). Its Zone devices are standard Indigo sensors, so you can easily use them in Indigo triggers. There is a Monitor device that lets you group any number of zones together and summarizes their status. Not only can you create triggers that fire if one of an arbitrary set of sensors activates; the Monitor device also gives you a human-readable list of all active members to display in control pages. ("Honey, which windows are open?" )
There are other Indigo plugins for Honeywell security systems. Shop around and see which one works best for you. Just don't ask me for support on the other ones...
If you have a Honeywell security system (with a serial port), give it a spin and let me know how it goes.
Cheers
-- perry