DEVA Broadcast DB7002 Maintenance And Operation Instruction Manual page 82

When an observation event takes place, the Alarm Trigger's State will refresh, if necessary.
Should we consider an instance when the Alarm Trigger is in Idle state, having in mind that an alarm
is not triggered immediately when a parameter level passes beyond threshold: If the parameter
level becomes stable, within Thresholds, and the Alarm Trigger Time is not elapsed, then the
Alarm Trigger remains in Idle state. If the Alarm Trigger Time expires and the parameter level is
still beyond limits, the Alarm Trigger would change its state to High/Low. This would result in
predefined actions - Alarm Notifications (E-mail, SMS, SNMP trap) and Save a Log Record. The
state will not be immediately switched into Idle when the parameter stabilizes, within Threshold
levels, not up until the 'Alarm Release Time' is elapsed. Meanwhile, if the parameter crosses again
any Threshold, the Alarm Trigger will remain in Active state. If the parameter remain within the
Threshold levels and the Alarm Release Time expires, then the Alarm Trigger would switch into
Idle state and again predefined actions would be initiated.
Hi Threshold
Alarm Idle No Alarm
If the RDS Group has not been received within the Alarm Trigger Time, the state would be
changed into Active. If the Active state and the Release Time have elapsed and the RDS Group is
received, the state is changed to Idle. Should the RDS Group is received before the Release Time
is elapsed, the state would remain Active.
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Period > Alarm Trigger Time
Period < Alarm Trigger Time
Alarm Idle
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Notification
for Active Alarm
No Alarm Alarm Active
Notification
for Idle Alarm
Period > Alarm Release Time
TIME
Alarm Idle