Dahua NVR21-4KS3 Series User Manual page 70

Port Name Connection
MIC OUT Audio output port
VGA video output
VGA
port
Network port
PoE PORTS PoE port
1–4 Alarm input port 1–4
GND
N1, N2
Alarm output port 1–
2
C1, C2
Power input port —
Power input port
Power switch
Function
Audio output port. It is to output the analog
audio signal to the devices such as the sound box.
● Bidirectional talk output.
● Audio output on 1-window video monitor.
● Audio output on 1-window video playback.
VGA video output port. Output analog video
signal. It can connect to the monitor to view
analog video.
10/100 Mbps self-adaptive Ethernet port. Connect
to the network cable.
Built-in switch. Support PoE function.
For PoE series product, you can use this port to
provide power to the network camera.
● 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.
Alarm input ground port.
● 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.
90~264-12 VAC 12.5 A/-53 V 2.83 A
Power socket.
Power on/off button.
50
User's Manual