User’s Manual
22
Rear Panel
3.2.1 DH-XVR51xxH-I/DH-XVR51xxH-I2/DH-XVR51xxH-I3/DH-
XVR51xxH-4KL-I2/DH-XVR51xxH-4KL-I3/DH-XVR51xxHE-I2/DH-
XVR51xxHE-I3/DH-XVR51xxHE-4KL-I2/DH-XVR51xxHE-4KL-I3/DH-
XVR71xxH-4K-I2/DH-XVR71xxH-4K-I3/DH-XVR71xxHE-4K-I2/DH-
XVR71xxHE-4K-I3/DH-XVR71xxHE-4KL-I
Rear panel
Table 3-11 Rear panel description
No. Port Name Function
1
Alarm input port
1–16
Four groups of alarm input 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, make sure the
alarm input device and the Device have the same ground.
Alarm output port
1–3 (NO1–NO3;
C1–C3)
Three 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. Make sure power
supply to the external alarm device.
NO: Normally open alarm output port.
C: Alarm output public end.
Ground.
2 Video input port Connects to analog camera to input video signal.
3 Audio input port
Receives audio signal output from the devices such as microphone.
It corresponds to video input port 1.
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