QNAP VioStor NVR User Manual page 113

Events:
The events supported by the NVR are classified as camera events (motion
detection, alarm input, camera disconnection), NVR events (recording failure),
and external events (user-defined events).
Note: The camera events available vary according to the features supported by
the IP cameras or video servers.
Buttons on the event list
Add an external event. This button is not applicable to camera events
and NVR events.
Edit an event. This button cannot be used to edit camera
disconnection.
Delete an external event. This button is not applicable to camera
events and NVR events.
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