Dahua HFD23/005-1ZS User Manual page 162

Configure the alarm input settings from the external IPC.
Click Apply to complete the settings.
Click Default to restore the default setting.
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Click Copy to to copy the settings to other channels.
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Click Refresh to refresh configured settings.
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5.10.2.4 Configuring Alarms for IP Camera Offline
You can configure the alarm settings for the situation when the IP camera is offline.
Select Main Menu > ALARM > Alarm-in Port > CAM Offline.
CAM offline
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User's Manual