CCTV Camera Pros Geovision 8.4 Multicam Digital Surveillance System - Manual (Page 312)

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6.1.1 Latch Trigger
Instead of constant output alarm in N/O and N/C, the Latch Trigger option provides a momentary alarm,
and allows you to set the alarm duration.
Setting up Latch Trigger:
On the main screen, click the Configure button (No. 14, Figure 1-2), point to General Setting, click
System Configure, click the I/O Device tab, and then check Latch Trigger. See the red square in this
dialog box.
Figure 6-4
Application Example:
In the above scenario, Input 4 is set to N/O and Latch Trigger as well. When Input 4 is triggered:
z Camera 1 starts recording for 30 seconds and stops itself until the next input trigger (see the Rec
Video option).
z Computer Alarm sounds once (see the Invoke Alarm option).
z The output (Module 3, Pin 7) is triggered simultaneously based on the Latch Trigger mode (see
the illustrations below).