These series DVRs use grounding alarm input
(DVR activate an alarm when alarm
input is connected to ground.}
Please refer to
Figure 2-2
for alarm input and output description.
a) In “in” low, from left to right ALARM (1…16) are 16-channel grounding alarm
input. Activated in low voltage.
b) In OUT row,1-NO C, 2-NO C, 3-NO C and 4-NO C are four normal open
relay outputs. 5-NO C NC is a NO/NC relay output.
c) “12V”: Need peripheral equipment p12 power with 1 A current.
d) AB is to control A,B line of 485 devices such as pan/tilt decoder. If you
need to connect a lot of pan-tilt decoders, you should parallel connect 120
“
between A, B lines.
e) “ ” is ground cable.
Please refer to Figure 2-3.
Figure 2-2
●
4/8/16-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.
2.4.5 About Alarm Output End
Figure 2-3
16
