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Dahua IP DVR NVR4216-I Manual

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Figure 2-10
Icon
Function
1–16
ALARM1–ALARM16. The alarm becomes activated in the
low level.
NO1 C1, NO2 C2, NO3 C3, NO4
C4
Four NO activation output groups. (On-off button).
NO5 C5 NC5
One NO/NC activation output group. (On-off button).
CTRL
Controllable power supply output. Control the output of the
on-off button alarm relay. It controls the alarm device with
the presence or absence of voltage. It can also be used as
power input for some alarm devices such as alarm
detectors.
Power output port. It can provide power to some peripheral
devices such as camera and alarm device. Make sure the
power supply of peripheral device shall be below 1A.
GND
A/B
485 communication port. They are used to control devices
such as PTZ. Please parallel connect 120TΩ between A/B
cables if there are too many PTZ decoders.
Different models support different alarm input ports. Please refer to the specifications sheet for
detailed information.
Slight difference may be found on the alarm port layout.
2.3.2 Alarm Input Port
Connect the positive end (+) of the alarm input device to the alarm input port (ALARM IN 1–16) of the
NVR. Connect the negative end (-) of the alarm input device to the ground end ( ) of the NVR.
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