SAE J1939文件适用于道路上或非道路上使用的轻型、中型和重型车辆，以及使用车辆衍生部件（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上和非公路卡车及其拖车、施工设备、农业设备和机具。这些文件的目的是为电子系统提供开放互联系统。这些文件旨在通过提供标准体系结构来允许电子控制单元相互通信。该特定文件SAE J1939-22描述了使用ISO 11898中定义的灵活数据速率的数据链路层- 2015年12月1日。CAN中的灵活数据速率能力（通常称为CAN FD）作为传输层实现，以实现功能安全、网络安全、扩展传输能力以及与SAE J1939DA的向后兼容性。

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 J1939-22, describes the data link layer using the flexible data rate as defined in ISO 11898-1, December 2015. The flexible data rate capability in CAN (commonly called CAN FD) is implemented as a transport layer in order to allow for functional safety, cybersecurity, extended transport capability, and backward compatibility with SAE J1939DA.