11
Please refer to the specifications for the alarm input and output channel amount. Do not
merely count the alarm input and out channel amount according to the ports on the rear
panel.
Please note the following contents are based on 16 channel 4HDD series product.
There are two alarm input types for you to select: normal open (NO) and normal close (NC).
1.9.1 Alarm Input and Output Details
Figure 1-7
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16
Alarm input port 1~16. The alarm becomes active
in low voltage.
NO1 C1,
NO2 C2,
NO3 C3,
NO4 C4,
NO5 C5 NC5
There are 5 groups of alarm output ports.
NO: Normal open alarm output port.
C: Alarm output public end.
NC: Normal close alarm output port.
CTRL 12V
Control power output. For external alarm, you
need to close the device power to cancel the
alarm.
Voltage current: 500mA.
12V
Rated current.
Voltage current: 500mA.
Earth cable.
A/B
RS485 communication port. They are used to
control devices such as decoder.
120Ω should be
parallel connected between A, B lines if there are
too many PTZ decoders.
T+,T-,R+,R-
They are four-wire full-duplex RS485 port
T+ T-: output wire
R+ R-: input wire
1.9.2 Alarm Input Port
Please refer to the following sheet for more information.
Grounding alarm inputs. (Normal open or Normal close type)
Please parallel connect COM end and GND end of the alarm detector (Provide external
power to the alarm detector).
Please parallel connect the Ground of the DVR and the ground of the alarm detector.
