Revo REHXN0412-1 Instruction Manual page 36

 Alarm In
Select "Enable" to activate the alarm event. The network camera supports 1 alarm input port.
- Type: Choose the type of alarm you wish to use from the drop-down list.
- Dwell Time: Set the dwell time of an event lasts for the specified dwell time from the point of
detection of an alarm input.
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