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Item
Default Status
Alarm
Duration/Delay(s)
Relay Mode
Description
Select the default status from the drop-down list. The default is
N.O.
•
N.O. : Choose this option if the external device is normally
open.
• N.C. : Choose this option if the external device is normally
closed.
Set the alarm duration, that is, the length of time that an output
alarm lasts after the alarm is ended.
• Custom: When enabled, you can set the length of time as
needed. After an alarm is cleared on the NVR, the third-party
alarm device continues alarm till the end of the set duration.
Note: The delay period supported by channels may vary. For most
channels, the valid range is 5 to 3600s. For certain channels, the valid
range is 1 to 3600s.
• Maximum: When enabled, you cannot set the delay period.
The third-party alarm device continues alarm until you clear it
manually.
Set the relay mode, including monostable and bistable. The
default is bistable.
Note: Set relay mode to better adapt to third-party alarm devices such as
alarm lights. Please set the relay mode according to the trigger mode of
the third-party alarm device.
• Monostable: The circuit can only remain in one stable state.
When a trigger pulse is applied, the circuit switches to another
state, and then automatically switches back to the original
stable state. The circuit will repeat the same actions when the
next trigger pulse arrives.
• Bistable: The circuit can remain in two stable states. When a
trigger pulse is applied, the circuit switches to another state,
and remains in this state after the trigger pulse is removed.
When the next trigger pulse is applied, the circuit switches back
to the other stable state and remains in that state.
159
UNIGUARD 4 & 8 HDD Series
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