QNAP VS-2004L en - Manual (Page 98)

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The event type occurred to an IP camera can be identified by the camera icon on an E-map.
Icon Description
A moving object has been detected
The alarm input 1 of the IP camera has been triggered
The alarm input 2 of the IP camera has been triggered
The alarm input 3 of the IP camera has been triggered
An unidentified event has been triggered