Patent ID: 6167057
Filing Date: 2000-12-26
Classification: H04L

Abstract:
A data communication system comprising:a common data bus; anda plurality of electronic control units, each including a central processing unit for controlling an electronic device and communication means, connected to the common data bus, each electronic control unit communicating with other electronic control units under a predetermined data transmission protocol through the common data bus, the communication means forming a communication frame that includes a message to be transmitted and other information necessary to transmit the message to other electronic control units;wherein a length of the message is variable;wherein the message is placed between a signal indicating the length of the message and an error check code, and a signal indicating an end of the message is placed immediately after the error check code; andwherein the message, the signal indicating the length of the message, and the error check code are coded according to a predetermined coding rule, and the signal indicating the end of the message is coded according to another coding rule, the other coding rule violating the predetermined coding rule.