I believe it is a 'rotation' based system, or whatever that would be called. I think the car has to sense from the TPMS that the rotations are faster on one tire than the rest and that is how it alerts. Sorry, don't know the technical terms. I'm sure someone else can elaborate on this! So since you weren't actually driving, no alert.
On a Mazda, you can tell which system you have by seeing if you have a TPMS Reset button somewhere on the dash. Those with the button have indirect TPMS. Those without the button have direct TPMS.
My Lexus has the button, but it also shows each tires actual pressure when called up. Besides not being able to display actual pressure values, what is different with Mazda that it doesn't need a reset button?
I think it will report once the vehicle starts to move. That sounds stupid, but it is like that if your tire lost air while parked.
The device saves power by reporting only periodically and more than certain minimum speed.
I had experience when my rear left tire got punctured by a bolt at highway speed. The pressure dropped very quickly within seconds. The light went on with beeps to go with it. This was with '08 CX9 which has TPMS sensors inside the tires.
i.e. when car is moving the sampling period is fairly short (a few seconds) I would guess.
Another time, the tire went flat while sitting in my garage because of a nail.
The TPMS light lit up while the car was moving out of garage, not at startup of engine.
Ha, havent seenMy Kawasaki motorcycle has direct TPMS and here's how that system works, I'm fairly certain that most, if not all, TPMS work the same way.
The pressure sensors do not continually broadcast pressure data, the batteries wouldn't last long if they did. The sensors 'wake up' by the rotation of the wheels and then they can broadcast data. Some systems, including Kawasaki's, also read temp and adjust the pressure reading accordingly.