19
Port Name Connection Function
open)/NC (normal close).
z When your alarm input device is using
external power, please make sure the
device and the NVR have the same
ground.
Alarm input port
ground end
Alarm input ground end.
NO1～NO3
C1～C3
3-ch alarm
output port
z 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.
z
NO：Normal open alarm output port.
z C：Alarm output public end.
A RS485_A port. It is the cable A. You can
connect to the control devices such as speed
dome PTZ.
B
RS485
communication
port
RS485_B.It is the cable B. You can connect to
the control devices such as speed dome PTZ.
Power port Input 12V DC.
Power button Power on/off button.
2.2.2 L Series
The L series rear panel is shown as below. See Figure 2-5.
Figure 2-5
Please refer to the following sheet for detailed information.
Port Name Connection Function
Power button Power on/off button.
Power input
port
Input AC 220
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