Dahua NVR21-4KS3 Series User Manual page 57

The NVR48-16P-EI/NVR44-16P-EI series rear panel is shown as below.
Name
Power switch —
Power input
—
port
MIC IN Audio input port
Audio output
MIC OUT
port
Video output
VIDEO OUT
port
Alarm input port
1–16
1–16
Video output
port
NO1–NO3
Alarm output
Figure 2-70 Rear panel
Figure 2-71 Rear panel
Table 2-23 Ports
Function
Power on-off button.
90~264-12 VAC 12.5 A/-53 V 2.83 A.
Bidirectional talk input port. It is to receive the analog audio
signal output from the devices such as microphone, pickup.
Audio output port. It is to output the analog audio signal to
the devices such as the sound box.
● Bidirectional talk output.
● Audio output on 1-window video monitor.
● Audio output on 1-window video playback.
CVBS output.
● There are four groups. The first group is from port 1 to
port 4, the second group is from port 5 to port 8, the
third group is from 9 to 12, and the fourth group is from
13 to 16. They are to receive the signal from the
external alarm source. There are two types; NO (normal
open)/NC (normal close).
● When your alarm input device is using external power,
please make sure the device and the NVR have the
same ground.
CVBS output.
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User's Manual