Operation of the Controller:
The controller initialise itself into a quiescent state. No sectors are identified as triggered, no tones are sounding. It initialises the display and monitors the sensors and the control buttons
When one sector is triggered the corresponding sector LED must start to flash an alert flash. No
audio tones will be issued at this time.
If the sector remains triggered for three seconds the alert tone must be issued, and the sector LED
will continue to flash.
If the sector remains triggered for a further three seconds (six seconds in total) the alert tone must
change to the evacuate tone and the sector LED will change to a solid lit state. The evacuate tone
must either: Preferably be a rising tone, or alternately change between two frequencies to ensure it
is easily distinguished.
If two or more sectors are triggered the controller must immediately change to the evacuate tone,
and all triggered sectors will change to a solid lit state.
If the emergency button is pressed on either the main controller or the mimic panel the system must
immediately change to the evacuate tone. No changes are made to the sector LEDs at this time, and
they continue with their normal operation.