Dahua NVR21-4KS3 Series User Manual page 315

Step 2 Select a channel and AI type.
Step 3 Click to enable the function.
Step 4 Configure the sensitivity.
The higher the value, the easier it is to trigger an alarm. But meanwhile, the false alarm
might occur. The default value is recommended.
Step 5 Select effective target from Human and Motor Vehicle.
Step 6 Click Setting next to schedule to configure the alarm period.
Step 7 Configure alarm linkage.
Parameter
Anti-Dither
Alarm-out Port
Post-Alarm
Figure 5-188 SMD
Table 5-50 Alarm linkage parameters
Description
The system records only one motion detection event within the defined
period.
When an alarm occurs, the NVR links the alarm output device to generate
an alarm. The alarm lasts a period of time depending on the defined
value for Post-Alarm.
● Make sure that the alarm devices are connected to the alarm output
port of NVR.
● In Main Menu > ALARM > Alarm-out Port, set the mode to Auto so
that the system can link the alarm output device to generate an
alarm.
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User's Manual