Connecting Basics 43
Make sure the front-end device has soundly earthed
Improper grounding might result in chip damage.
4.3.1 Introducing Alarm Port
The alarm input ports are dependent on the model you purchased.
Figure 4-3
1，2，3，4，5，6，
7，8，9，10，11，
12，13，14，15，16
ALARM 1 to ALARM 16. The alarm becomes active in low voltage.
NO1 C1, NO2 C2,
NO3 C3, NO4 C4
There are four groups of normally open activation output (on/off button).
There is one group of normally open activation output (on/off button).
Control power output of the alarm output channel 6. Electric current:
500mA.
When there is an alarm output, close the power output.
When the alarm is cancelled, open the power output.
Rated power supply.
Electric current: 500mA.
485 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.
Four-wire full-duplex RS-485 port.
T+ T-: output wire.
R+ R-: input wire.
Table 4-1
4.3.2 Alarm Input
Refer to the following figure for more information.
Grounding alarm inputs which includes NO (Normally Open) and NC (Normally Closed)
type.
Parallel connect COM end and GND end of the alarm detector (Provide external power to
the alarm detector).
Parallel connect the Ground of the DVR and the ground of the alarm detector.
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