Users Manual Part 1

55
Figure 2-75 Alarm port
Table 2-41 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 p
arallel 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 1–16) of the
NVR. Connect the negative end (-) of the alarm input device to the ground end ( ) of the NVR.