Dahua NVR4108-P User Manual page 65

Please refer to the following sheet for detailed information.
Name
RS-232
HDMI
VGA
1～8
NO1～NO3
C1～C3
A
B
Figure 2-30
Function
USB2.0 port. Connect to mouse, USB storage
USB2.0 port
device, USB burner and etc.
10M/100M/1000Mbps self-adaptive Ethernet port.
Network port
Connect to the network cable.
RS-232 debug It is for general COM debug to configure IP
COM. address or transfer transparent COM data.
High definition audio and video signal output port.
High Definition It transmits uncompressed high definition video
Media Interface and multiple-channel data to the HDMI port of the
display device. HDMI version is 1.4.
VGA video output port. Output analog video
VGA video
signal. It can connect to the monitor to view analog
output port
video.

Alarm input port
1～8

GND Alarm input ground port.

Alarm output port
1～3

 C：Alarm output public end.
RS485_A port. It is the cable A. You can connect
RS-485
to the 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.
There are two groups. The first group is from
port 1 to port 4; the second group is from port
5 to port 8. 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.
3 groups of alarm output ports. (Group 1：port
NO1 ～ C1,Group 2:port NO2 ～ C2,Group
3:port NO3～C3）).Output alarm signal to the
alarm device. Please make sure there is
power to the external alarm device.
NO：Normal open alarm output port.
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