Dahua Technology XVR4 Series, User Manual

Page: 38 / 330

The Grand Tour 25
No. Port Name Function
3 Power button Turns on/off the Device.
4 Audio input port
Receives the analog audio signal output from the devices such
as microphone.
5
Audio input port
(MIC IN)
Tow-way talk input port which receives the analog audio signal
output from the devices such as microphone, pickup.
6
Audio output port
(MIC OUT)
Tow-way talk output port which outputs the analog audio signal to
the devices such as the sound box.
7
Audio output port
Outputs the analog audio signal to the devices such as the sound
box.
8
Video output port
Connect to video output devices such as TV.
9
Alarm input port
1
–16
Four groups of alarm output ports (Group 1: port 1 to port 4;

Group 2: port 5 to port 8; Group 3: port 9 to port 12; Group 4:
port 13 to port 16). These ports receive the signal from the
external alarm source. There are two types; NO (Normally
Open) and NC (Normally Closed).
When your alarm input device is using external power,

please make sure the device and the NVR have the same
ground.
Alarm output port
1
–5 (NO1–NO5;
C1
–C5; NC5)
Five 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). These ports
output alarm signal to the alarm device. Please make sure
power supply to the external alarm device.
NO: Normally open alarm output port. 
C: Alarm output public end.

NC: Normally closed alarm output port.

RS-485
communication
port
You can connect to the control devices such as speed dome
PTZ. RS-485_A port is connected by the cable A and RS-485_B
is connected to the cable B.
Four-wire
full-duplex
RS-485 port (T+,
T-, R+, R-)
Four-wire full-duplex 485 port. T+ and T- is the output wire; R+
and R- is the input wire.
Control power
output (CTRL
12V)
Controls 12V DC power output. It is to control the on-off alarm
relay output.
12V power output
port
Provides power to external devices such as camera and alarm
device. Please note the supplying power shall be below 1A.
Ground.
10 Video input port Connect to analog camera to input video signal.
11 Network port Connects to Ethernet port.