Dahua NVR4108-P User Manual page 62

Please refer to the following sheet for detailed information.
Name
Power switch
Power input
port
MIC IN
MIC OUT
VIEDEO OUT
1～16
NO1～NO5
C1～C5
NC5
A
B
CTRL 12V
Figure 2-28
Function
Power on-off button
/
Input AC 100~240V.
/
Audio input port Bidirectional talk input port. It is to receive the
analog audio signal output from the devices such
as mike phone, pickup.
Audio output port. It is to output the analog audio
Audio output port
signal to the devices such as the sound box.



Video output port
CVBS output.

Alarm input port
1～16

GND Alarm input ground port.

Alarm output port
1～5



RS485_A port. It is the cable A. You can connect to
RS-485
the control devices such as speed dome PTZ.
communication
port
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.
Bidirectional talk output.
Audio output on 1-window video monitor.
Audio output on 1-window video playback.
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.
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.
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