This must be a stupid question, but I'm a bit lost trying to understand Pixhawk outputs. From what I've gathered, Pixhawk doesn't provide power to the servo rail, so I will have to provide power from ESC or BEC. Simple enough. But when I read the wiki page here [http://plane.ardupilot.com/wiki/common-pixhawk-wiring-and-quick-start/] I'm getting confused. The page is talking about backup power to the Pixhawk through the servo rail and adding a diode..? What/how do I need to connect to the outputs for a simple non-redundant setup? I'm afraid to just try something in case I might fry the Pixhawk.