What happens if I fail to exit the premises before the exit delay expires after arming the system?
If an entry/exit door or interior zone remains faulted when the exit delay expires, the system sounds an alarm and starts the entry delay timer. If you disarm the system before the entry delay ends, the alarm stops and 'ALARM CANCELED' is displayed, and no message is sent to the Central Monitoring Station. If you do not disarm in time, the alarm continues and an 'EXIT ALARM' message is sent to the Central Monitoring Station after the installer-programmed dial delay expires. (Page 15)
From the official Honeywell Vista-20P Security System manual, page 15
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