Dahua NVR4108-P User Manual page 58

Please refer to the following sheet for detailed information.
Name
Power
switch
Power input
socket
MIC IN
MIC OUT
1～4
N1, N2
C1, C2
A
B
Figure 2-23
Function
/ Power on/off button.
Input AC 100~240V.
/
For NVR42-8P series product only.
Input DC 12V/5A.
Power input port
For NVR42 series product only.
Power input port Switch power port. Input DC 48//1.04A.
For NVR42-P series product only.
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 signal
Audio output port
to the devices such as the sound box.




Alarm input port

1～4
GND Alarm input ground port.

Alarm output port
1～2


RS485_A port. It is the cable A. You can connect to the
RS-485
control devices such as speed dome PTZ.
communication
RS485_B.It is the cable B. You can connect to the
port
control devices such as speed dome PTZ.
Bidirectional talk output.
Audio output on 1-window video monitor.
Audio output on 1-window video playback.
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.
2 groups of alarm output ports. (Group 1：port
NO1～C1,Group 2:port NO2～C2).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.
46