Dahua NVR21-S2 SERIES - Page 268

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Figure 4-142
Step 2 Select a channel number and then check the box to enable the function.
Step 3 Click Setup button.
Enter setup interface. See Figure 4-143.
Figure 4-143
Step 4 Set arm/disarm period. Refer to chapter 4.7.1.1 Motion detect for detailed setup information.