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Door cameras and auxiliary cameras can be powered in two ways, either locally or via the main monitor.

 

The DoorKnox monitors can supply a 12V DC output to any of the four cameras but can only supply a maximum of 400mA across all outputs.

 

To power a camera locally connect the Audio (white) and Video (yellow) to the door monitor, the GND (black) to the PSU and the door monitor and then the 12V DC (red) to the PSU only.