DVR systems NVR38xx Series - Manual (Page 21)

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Port Name Connection Function
1～16 Alarm input port.
1～16 I/O port
 Four groups of alarm input ports. The first
group is from port 1 to port 4, the second
group is from port 5 to port 8, the third
group is from 9 to 12, and the fourth group
is from 13 to 16. They are to receive the
signal from the external alarm source.
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.
Ground end Alarm input ground end.
NO1～NO5 Alarm output
port 1～5 5 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).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.
NC: Normal close alarm output port.
C1～C5
NC5
A RS485 port RS485_A port. It is the cable A. You can
connect to the control devices such as speed
dome PTZ.
B RS485_B.It is the cable B. You can connect to
the control devices such as speed dome PTZ.
CTRL 12V Controllable 12V power output. It is to control
the on-off relay output. You can use it to enable
device alarm function.
It can also be used as the power input for some
alarm devices such as the smoke detector.
+12V +12V power output port. It is to provide the
power to the peripheral devices such as camera
or alarm device. The connected device current
shall be less than 1A.