Dahua Technology LE-A - Manual (Page 27)

27
Figure 3-6
Parameter
Grounding Alarm
Ground line
Alarm Input 1, 2, …, 8. It becomes valid in low voltage.
1-NO C，
2-NO C，
3-NO C Three NO activation outputs.
Relay Output 1,2,3,4: NO and C(Normally Open and Com)
5: NO,C and NC(Normally Open, Com, Normally Closed)
6: Ctrl 12V(This is used for reset the senor)
485 A/B 485 communication port. They are used to control devices such as
PTZ. Please parallel connect 120
T
Ω between A/B cables if there are
too many PTZ decoders.
T
3.7.2 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 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 3-7
3.7.3 Alarm Output Port
z 3 ways relay alarm output (NO contact). Provide external power to external alarm device.
z To avoid overloading, please read the following relay parameters sheet carefully.
z RS485 A/B cable is for the A/B cable of the PTZ decoder.
Relay Specification
Model: JRC-27F
Material of the
touch
Silver
Rated switch capacity 30VDC 2A, 125VAC 1A
Maximum switch power 125VA 160W
Rating
（
Resistance
Load）
Maximum switch voltage 250VAC, 220VDC