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What would be the best power UPS battery backup to run NVR / DVR units if power is out for hours ???

Hi I have my dahua camera hooked to my hikvision nvr I need to know What PTZ Protocol setting and adrress range NVR gives 0-255 range to choose from the camera is on picture displays and zoom in and out works camera will not tilt or pan , i must have a setting not rithg in the PTZ Parameter...