Dahua Technology LE-L - Manual (Page 35)

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In the second line,
from the left to the
right,: 1，2，3，4，
5，6，7，8，
In the first line, from
the left to the right:
9，10，11，12，
13，14，15，16 ALARM 1 to ALARM 16. The alarm becomes active in low voltage.
In the second line,
from the left to the
right:
NO1 C1，
NO2 C2，
In the first line, the
NO3 C3 The three groups of normal open activation outputs(on/off button)
Earth cable.
485 A/B 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.
3.8.2 Alarm Input Port
Please refer to the following sheet for more information.
z
4/8/16-ch grounding alarm inputs. (Normal open or Normal close type)
z Please parallel connect COM end and GND end of the alarm detector (Provide external
power to the alarm detector).
z Use the controllable +12V power to reset the smoke sensor remotely.
z Please parallel connect the Ground of the DVR and the ground of the alarm detector.
z Please connect the NC port of the alarm sensor to the DVR alarm input(ALARM)
z Use the same ground with that of DVR if you use external power to the alarm device.
Figure 3-8
3.8.3 Alarm Output Port
z The 4 HDD series DVR has 6 ways relay alarm outputs and the 2 HDD series DVR has 3
ways relay alarm outputs. (NO contact). Provide external power to external alarm device.
z To avoid overloading, please read the following relay parameters sheet carefully.
z For controllable +12V, it can be used to provide power to devices such as reset smoke
sensor.
z RS485 A/B cable is for the A/B cable of the PTZ decoder.