Dahua NVR4204-P-4KS2 User Manual page 138

Name
MIC IN
Audio input port
MIC OUT
Audio output port
Video output port
VIEDEO OUT
Alarm input port
1～16
1～16
Video output port
Alarm output port
NO1～NO5
1～5
C1～C5
NC5
A
RS-485
communication
B
port
CTRL 12V /
+12V /
Network port
Function
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

5 groups of alarm output ports. (Group 1：port
NO1～C1,Group 2:port NO2～C2,Group 3:port
NO3～C3, Group 4：port NO4～C4, Group 5:
port NO5, C5, NC5).Output alarm signal to the
alarm device. Please make sure there is power
to the external alarm device.

NO: Normal open alarm output port.

C: Alarm output public end.

NC: Normal close alarm output port.
RS485_A port. It is the cable A. You can connect to
the control devices such as speed dome PTZ.
RS485_B.It is the cable B. You can connect to the
control devices such as speed dome PTZ.
Controller 12V power output. It is to control the
on-off alarm relay output. It can be used to control
the device alarm output. At the same time, it can
also be used as the power input source of some
devices such as the alarm detector.
+12V power output port. It can provide the power to
some peripheral devices such as the camera or the
alarm device. Please note the supplying power
shall be below 1A.
10M/100M/1000Mbps self-adaptive Ethernet port.
Connect to the network cable.
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