DATA TRANSMISSION SYSTEM FOR VEHICLE

摘要

When no sending right occurs within a given period of time and the network bus is in an idle state (that is, the answer of step S1 is negative (NO), and the answer of step S2 is affirmative (YES)), it is judged that a control unit (node) has acquired the sending right and begins sending out a message. If no collision of the sent-out message is detected (the answer of step S4 is negative (NO)), the acquisition of the sending right is defined. If any collision of the message is detected (the answer of step S4 is affirmative), the above-mentioned steps will be repeated subsequent to the passage of a waiting time genuine to this control unit.