Alarm Input Port - Dahua NVR41-4KS2 Series User Manual

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1–16
NO1 C1, NO2 C2, NO3
C3, NO4 C4
NO5 C5 NC5
CTRL (CTRL 12V)
P (+12V)
A/B
● Different models support different alarm input ports. Please refer to the specifications sheet for
detailed information.
● Slight difference might 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.
Figure 2-78 Alarm Port
Table 2-39
Function
ALARM1–ALARM16. The alarm becomes activated in the low level.
Four NO activation output groups. (On-off button).
One NO/NC activation output group. (On-off button).
Control power output. Disable power output when alarm is canceled.
Current is 500mA.
Rated current output. Current is 500mA.
GND
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.
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User's Manual