Dahua NVR4108-P Quick Start Manual page 11

Port Name
NC5
RS485 （RS-
A
485）
communication
port
B
CTRL 12V
+12V
Network port
eSATA eSATA port
USB port.
RS232 RS232 debug
COM.
HDMI High Definition
Media
Interface
VGA VGA video
output port
PoE PORTS 8-channel PoE
port
Function
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.
Two 10M/100M/1000M self-adaptive
Ethernet ports. Connect to the network cable.
External SATA port. It can connect to the
device of the SATA port. Please jump the
HDD when there is peripheral connected
HDD.
Connect to USB mouse.
It is for general COM debug to configure IP
address or transfer transparent COM data.
High definition audio and video signal output
port. It transmits uncompressed high
definition video and multiple-channel data to
the HDMI port of the display device.
The version number is 1.3.
VGA video output port. Output analog video
signal. It can connect to the monitor to view
analog video.
Built-in Switch supports PoE function.
The 8-channel PoE port seres product
support total 48V,120W. One PoE port max
supports
supplying to network camera.
15W. It can provide power
6