I've built a Z-wave PIR as an experiment...
Components:
http://www.amazon.com/gp/product/B000W41J6S
http://www.amazon.com/gp/product/B0030G8SC8
http://www.amazon.com/gp/product/B008Q5CTBE
Motion detection on the PIR sends power to the relay, which closes the z-wave door sensor, sending a "tripped" state alert to my VeraLite. The VeraLite runs a scene that sends an external trigger to Blue Iris, to trigger motion recording on a group of cameras covering the front of my house.
I chose the RAB PIR because unlike most of these lighting PIRs, the RAB can be set to detect motion during daylight hours.