数据链路层

[中文适用范围]： SAE J1939 文件适用于公路或越野使用的轻型、中型和重型车辆以及使用车辆衍生组件（例如发电机组）的适当固定应用。感兴趣的车辆包括但不限于公路和非公路卡车及其拖车、建筑设备以及农业设备和工具。这些文档的目的是为电子系统提供开放式互连系统。这些文档的目的是通过提供标准架构来允许电子控制单元相互通信。该特定文档 SAE J1939-21 描述了使用带有 29 位标识符的 CAN 协议的数据链路层。对于 SAE J1939，不允许使用替代数据链路层。 [外文原描述]： The SAE J1939 documents are intended for light, medium, and heavy-duty vehicles used on or off road, as well as appropriate stationary applications which use vehicle derived components (e.g., generator sets). Vehicles of interest include, but are not limited to, on- and off-highway trucks and their trailers, construction equipment, and agricultural equipment and implements.The purpose of these documents is to provide an open interconnect system for electronic systems. It is the intention of these documents to allow Electronic Control Units to communicate with each other by providing a standard architecture.This particular document, SAE J1939-21, describes the data link layer using the Classical Extended Frame Format (CEFF) with 29-bit IDs, as defined in ISO 11898-1, December 2015. For SAE J1939, no alternative data link layers are permitted.Cross Reference: ISO 11898,ISO 15765-3,J1939/71_201506,J1939/81_201602,J1939_201808