商用车控制系统局域网络（CAN ）通信协议之第4部分：数据链路层，与J1939兼容。-Commercial Vehicle Control System Area Network (CAN) communication protocol of Part 4: Data link layer, and J1939-compatible.

SAE J1939-21 J1939协议数据链路层协议，SAE J1939是基于CAN2.0B的数据链路层协议(SAE J1939-21 J1939 protocol, data link layer protocol, SAE J1939 is a data link layer protocol based on CAN2.0B)

J1939协议中文翻译版，主要内容为数据链路层 ，J1939主要用在货运卡车项目中，很好的学习资料(J1939 protocol Chinese translation version, the main content is the data link layer, J1939 is mainly used in freight truck project, good learning materials)