Dahua N41C1P, User Manual, Page: 30 / 377

User's Manual
14
2.3 Alarm Connection
2.3.1 Alarm Port
The alarm port is shown as below. The following figure is for reference only.
Figure 2-97 Alarm port
Table 2-45 Alarm port description
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 (CTRL 12 V)
Control power output. Disable power output when alarm is
canceled. Current is 500 mA.
P (+12 V) Rated current output. Current is 500 mA.
GND.
A/B
485 communication port. They are used to control devices such
as PTZ. Please parallel connect 120 TΩ between A/B cables if
there are too many PTZ decoders.
●
Different models support different alarm input ports. Please see 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–