A vision system for a vehicle includes an imager for a vehicular camera and a data receiving device operable to receive image data captured by the imager. A data transfer system communicates captured image data from the imager to the data receiving device. The data transfer system includes a single differential data line. The single differential data line may use a bi-directional high speed serial differential signaling protocol and a mixed signal PHY interface at each of a plurality of nodes of the single differential data line.