Performance Series Network Video Recorder User Guide
242
Guidelines for Connecting Local Alarm Input Ports
• Ground alarm inputs. Choose from normally open (NO) or normally closed (NC).
• Connect the COM end and GND end of the alarm detector in parallel. Supply external
power to the alarm detector.
• Connect the ground of the NVR and the ground of the alarm detector in parallel.
• Connect the NO/NC port of the alarm sensor to the NVR alarm input.
• Use the same ground as the NVR if you are supplying external power to the alarm device.
Guidelines for Connecting Alarm Output Ports
• Provide external power to external alarm device.
• To prevent overloading, carefully review the following relay specifications:
Table 14-2 Guidelines for Connecting Alarm Output Ports
Material
Nickel/silver contacts with gold
plating
Rating
(Resistance
Load)
Rated switch capacity 30 V DC 1A; 125 V AC 0.5A
Maximum switch power 62.5 V AC, 30 W
Maximum switch voltage 125 V AC; 60 V DC
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