Research and Implementation of DM1 Based on the J1939

The J1939 protocol is a communication protocol widely used in automotive electronic network. It supports real-time closed-loop control and communication among electronic control systems which are distributed in the whole vehicle. This paper focuses on the overall structural characteristics of the J1939 protocol and DM1(the Active Diagnostic Trouble Codes), deeply studies and analyzes the storage mode of the DM1 and the packet transmission, it designs and implements it function, improves the storage structural characteristics and filling mode of DM1. The improved storage structure and filling mode can effectively reduce the high demand for storage space, and not only access efficiently, but also reduce the size of the used space. Through the in-depth research, analysis, implementation and improvement of the paper, DM1 in J1939 protocol has further improved the communication efficiency in the practical applications.