Vivotek ND8321 User Manual page 157

4-6. Camera preset points - 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 web console.
4-7. Camera DO - A triggered alarm triggers a camera's DO, e.g., an alarm siren.
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User's Manual - 157