Assuming it is an Iris V2 or V3, or Centralite/Xfinity
With my smartapp SHM Delay V2.0 you can use it to arm and disarm SHM and create exit and entry delays. I think it’s about useless for a motion detector since you need to get within a few inches to trigger it, but better than nothing. Its main hardware purpose is to turn on the keypad’s lights. I also use pins to perform functions like turn on/off lights, open garage doors, execute a WebCore Piston etc
The keypad hardware pairing and SHM Delay smartapp both have substantial learning curves, so take your time.