Dahua NVR2104-I2, User Manual

Page: 73 / 459

No. Port Name Function
4
Alarm input/output
of NVR52-16P-I/
NVR52-16P-I/L and
NVR52-8P-I/
NVR52-8P-I/L
Alarm input
port (1-4)
●
They receive signals from external alarm
source. Alarm input includes two types; NO
(normal open) and NC (normal close).
●
When your alarm input device is using external
power, make sure the device and the NVR have
the same GND.
Alarm output
port (NO1-
NO2, C1-C2)
●
Two groups of alarm output ports (Group 1:
NO1-C1, Group 2: NO2-C2). Output alarm
signal to the external alarm device. Make sure
power supply is available for the external alarm
device.
●
NO: Normal open alarm output port.
●
C: Alarm output public end.
GND. Alarm input ground port.
RS-485 port
(A, B)
●
RS485_A port. Control cable A of the 485
device. It connects external devices such as
speed dome and PTZ.
●
RS485_B port. Control cable B of the 485
device. It connects external devices such as
speed dome and PTZ.
Alarm input/output
of NVR4216-16P-I
Alarm input
port (1-4)
●
They receive signals from external alarm
source. Alarm input includes two types; NO
(normal open) and NC (normal close).
●
When your alarm input device is using external
power, make sure the device and the NVR have
the same GND.
Alarm output
port (NO1,
C1)
●
One group of alarm output ports (Group 1:
NO1-C1). Output alarm signal to the external
alarm device. Make sure power supply is
available for the external alarm device.
●
NO: Normal open alarm output port.
●
C: Alarm output public end.
GND. Alarm input ground port.
CTRL
Controllable 12 V power output. It is to
control the on-off alarm relay output. It
can be used to control the device alarm
output. At the same time, it can also be
used as the power input source of some
devices such as alarm detector.
The two
ports
serve as
another
group
User's Manual
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