Dahua NVR21-4KS3 Series User Manual page 84

No. Port Name
Alarm
input/output of
NVR4216-16P-I
Function
● Two groups of alarm output ports (Group 1:
NO1-C1, Group 2: NO2-C2). Output alarm
Alarm
signal to the external alarm device. Make
output port
sure power supply is available for the
(NO1-NO2,
external alarm device.
C1-C2)
● NO: Normal open alarm output port.
● C: Alarm output public end.
GND. Alarm input ground port.
● RS485_A port. Control cable A of the 485
device. It connects external devices such as
RS-485 port
speed dome and PTZ.
(A, B)
● RS485_B port. Control cable B of the 485
device. It connects external devices such as
speed dome and PTZ.
● They receive signals from external alarm
source. Alarm input includes two types; NO
Alarm input
(normal open) and NC (normal close).
port (1-4)
● When your alarm input device is using
external power, make sure the device and
the NVR have the same GND.
● One group of alarm output ports (Group 1:
NO1-C1). Output alarm signal to the external
Alarm
alarm device. Make sure power supply is
output port
available for the external alarm device.
(NO1, C1)
● NO: Normal open alarm output port.
● C: Alarm output public end.
GND. Alarm input ground port.
Controllable 12 V power output. It is to
control the on-off alarm relay output.
It can be used to control the device
CTRL alarm output. At the same time, it can
also be used as the power input
source of some devices such as alarm
detector.
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User's Manual