Dahua Smart 1U User Manual page 170

Configure the alarm input settings from the external IPC. For details, see Table 5-46.
Click Apply to complete the settings.
Click Default to restore the default setting.
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Click Copy to copy the settings to other channels.
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5.10.5.5 Configuring Alarms from External Devices
Select Main Menu > ALARM > ALARM INPUT > Ext. Alarm.
The Ext. Alarm interface is displayed. See Figure 5-138.
Local Configurations 160