Specs for the PRO-A855 imply it's an HD camera, so it can't be just 480i composite.
One thing that comes to mind is the AHD video format which was the rage briefly until IP cameras got cheap. When plugged into a standard SD monitor if it syncs you get a really badly vertically scrolling image. There are however adapters to convert from AHD to composite/VGA/HDMI.
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