Two days ago, I was on the way to the grocery store when my cell phone rang. Now, my cell phone is not the primary way people normally communicate with me so I thought "Hmm... I hope this is not the alarm system calling me." Anyway, after I had parked (no driving and fiddling with a cell phone at the same time!!!!!!), I checked my phone and saw that my wife had called me. I called her back to learn that our alarm system had called her. (Somehow I missed the call to my phone.)
So I turned around and went back home... because well, maybe someone tried to break in. More likely though, I thought the cats had tripped a motion detector. The system was installed a little before Christmas so it is still relatively new and could have needed a bit of calibration. I was concerned about the neighbors being disturbed by the siren. When I arrived, I found the front door locked. I entered, disarmed the alarm system and checked its memory. I found the only zone tripped was the front door. Oops... my cat theory went out the window. I spent a good five minutes there wondering what to do next. Was I going to walk around the house only to come face to face with a burglar? It would have been unlikely that someone came, bypassed the locks on the doorknob and the deadbolt somehow, tripped the alarm and then locked behind themselves. I eventually also reasoned that if someone had come in the house and was still in the house, they would have tripped the motion sensors. They have been strategically located and tested so that it is impossible enter the front door or move from one floor to another without tripping them. I still went around the house just in case to check but everything was normal. (Except the cats, who did not appreciate that the siren went off.)
I later figured out why the front door contact was tripped. I was closing the door too fast for the magnetic contact. It was not registering that the door had closed (so the alarm would automatically go off after the exit delay and the entry delay had expired.) I found that if I close the door slowly, it works fine.
One thing I should have done but did not do is check the system status remotely before entering the house.
a bit of a scare
1And there comes a time when one must take a position that is neither safe, nor politic, nor popular, but he must do it because Conscience tells him it is right. -- MLK