I know this is a older thread but I wanted to ask if anyone had considered the pcpoodle alarm system?, I think it would be the best hands down if it would work with a ISY994i and insteon hub/plm running at the same time. if this would work using both I would get one, the designer has some good videos of features and modules that are compatible with Insteon at a fair price but I haven't been able to find anyone using it that has a ISY994 or someone running both hubs making it work????
Alarm
http://pcpoodle.com/collections/insteon-alarm-system/products/alarmlab-security-controller-with-insteon-plm
Main Page
http://pcpoodle.com/collections/insteon-alarm-system