A sunroof mechanism for a vehicle includes track members mounted to the roof at side edge portions of an opening in the vehicle roof. The power delivery system includes at least two power supplies with a bridge connecting an output of each of the at least two power supplies. The controller is able to vary the time interval between the transmission of control information that requests a data transfer and the performance of the data transfer by signaling the beginning of the data transfer with a strobe signal sent separate from the control information.