14
6: Ctrl 12V(This is used for reset the senor)
485 A
、
B
485 communication port. They are used to control devic
such as PTZ.
+12
（
C
）
This should input an external power input(Less than 1 A).
4-ch 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.
Please connect the NC port of the alarm sensor to the DVR alarm input(ALARM)
If you need to reset the touched-off alarm remotely, you can use DVR to supply
controllable 12 V power to the alarm detector such as the smoke detector.
Use the same ground with that of DVR if you use external power to the alarm
device.
Figure 1-8
1.5.2
Relay Output Description
2 ways relay alarm output. Provide external power to external alarm device.
To avoid over loading, please read the following relay parameters sheet carefully.
(See below table)
The contro12v can be used to restore the smoke detector.
