Dahua DHI-NVR5208-4KS2 User Manual page 247

Step 2 To configure the settings for the scene change parameters, see "4.8.5.1 Motion Detect."
The scene change function does not have region and sensitivity items.
Step 3 Click Apply to complete the settings.
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4.8.5.5 PIR Alarm
When the detected scene has changed, system can generate an alarm.
PIR function helps enhancing the accuracy and validity of motion detect. It can filter the meaningless
alarms that are activated by the objects such as falling leaves, flies. The detection range by PIR is
smaller than the field angle.
PIR function is enabled by default if it is supported by the cameras. Enabling PIR function will get the
motion detect to be enabled automatically to generate motion detection alarms; if the PIR function is
not enabled, the motion detect just has the general effect.
Step 1 Select Main Menu > ALARM > VIDEO DETECT > PIR ALARM.
The PIR Alarm interface is displayed. See Figure 4-174.
Click Default to restore the default setting.
Click Copy, in the Copy dialog box, select the additional channel(s) that you want
to copy the motion detection settings to, and then click Apply.
Figure 4-173
Local Basic Operation 236