GeoVision GV-IPCAM User Manual page 280

Input Off: Select a preset point to which the camera returns when
the input triggering is off.
Duration to set preset after input off: Specify the duration that
the camera stays at the Input On point before returning to the Input
Off point.
Note:
1. The GV-IP Cameras support dry-contact input device.
2. The functions "triggering the output", "starting the recording when
the input is triggered" and "sending video to Center V2" only work
after you start Input monitoring manually or by schedule. To
configure the input monitoring, see 16.4 Monitoring.
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