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4-5� Camera DO: A triggered event triggers a camera's DO� For example, an alarm siren�
4-6� Camera pan-tilt-zoom: A PTZ capable camera can move its lens to the preset
position in case of a triggered alarm� For example, a triggered sensor may indicate an area
of interest has been intruded, and a camera's field of view should be moved to cover that
area� The precondition is that you properly set up preset positions on your PTZ cameras
using a local or a web console�
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