User manual

85XX Series Network DVR User Manual……………………………………………………………………….V1.0
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To explain this concept, consider the following diagram where no Alarm Holdoff Time is configured:
In this detection scenario, the person enters the zone 3 times. At each point an alarm is raised, resulting in a
total of 3 alarms. With the Alarm Holdoff Time configured, it's possible to prevent re-triggering of the same rule
for the same object within the configured time period. Consider the same scenario, but with an Alarm Holdoff
Time of 5 seconds configured:
In this case, an alarm is not raised when the person enters the zone for the second time, because the time
between the occurrence of the last alarm of the same type for the object is less than the Alarm Holdoff Time.
When the person re-enters the zone for a third time, the elapsed time since the previous alarm of the same
type for that object is greater than the Alarm Holdoff time and a new alarm is generated.