Dahua DHI-NVR5208-4KS2 User Manual page 200

Step 4 Configure the parameters. See Table 4-30.
Parameter Description
Configure the period and in the set time range, the corresponding configuration
Period
item will be linked to start the alarm.
The alarm device (such as lights, sirens, etc.) is connected to the alarm output
Alarm Out port. When an alarm occurs, the NVR device transmits the alarm information to
the alarm device.
When the alarm ends, the alarm extended for a period of time. The time range is
Latch
from 0 seconds to 300 seconds.
Select the check box. When an alarm occurs, the NVR device uploads an alarm
signal to the network (including the alarm center).
Alarm
Upload  This function is for some series products only.
You need to set the alarm center first. For details, see "4.12.9 Alarm

Centre."
Select the check box. When an alarm occurs, the NVR device sends an email to
the set mailbox to notify the user.
Send Email
You need to set the email first. For details, see "4.12.6 Email."
Figure 4-131
Table 4-30
Local Basic Operation 189