Hi Peter. I do not know if it is the same everywhere but for this area elevator recall works like this.
A smoke detector is installed in front of every elevator door. When one of these smoke detectors trips it sends a signal to the elevator control system.
We provide two signals Primary and Secondary.
Primary and secondary floors are chosen, typical the primary floor is the floor with easiest exit from the building.
If the primary floor is floor one, any smoke detector tripping on another floor sends the car to floor one.
If the smoke detector on floor one trips the elevator is sent to the secondary floor.
Once smoke is detected the cars make one trip to the assigned floor and park on that floor with the doors wide open.
The elevator is now unusable to all but the FD with the use of their key.
The idea is not to send people to the fire floor.
[This message has been edited by iwire (edited 10-13-2004).]
Construction & Maintenance Electrician