Q-See QC40198 - Manual (Page 29)

INSTALLATION & CONNECTION
QC40198 User Manual
20 | P a g e
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