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INSTALLATION & CONNECTION QC40198 User Manual
20 | Page
3.7.2 Alarm Input Port
Refer to the following sheet for more information.
Normal open or Normal close 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 combo DVR and the ground of the alarm detector.
Connect the NC port of the alarm sensor to the combo DVR alarm input (ALARM)
Use the same ground with that of combo DVR if you use external power to the alarm device.
Figure 3-8
3.7.3 Alarm Output Port
3 way relay alarm output (NO contact). Provides external power to external alarm device.
To avoid overloading, please read the following relay parameters sheet carefully.
RS485 A/B cable is for the A/B cable of the PTZ camera.
Relay Specification
Model: JRC-27F
Material of the
contact
Silver
Rating（Resistance
Load）
Rated switch capacity
30VDC 2A, 125VAC 1A
Maximum switch power
125VA 160W
Maximum switch voltage 250VAC, 220VDC
Maximum switch currency
1A
Insulation
Between contacts with same
polarity
1000VAC 1minute
Between contacts with
different polarity
1000VAC 1minute