SAE J1939 is a set of standards that define how ECUs communicate via CAN bus in heavy-duty vehicles. As explained in our CAN bus intro, most vehicles today use the Controller Area Network (CAN) for ECU communication. However, CAN bus only provides a "basis" for communication - not a "language" for conversation.

Society of Automotive Engineers standard SAE J1939 is the vehicle bus recommended practice used for communication and diagnostics among vehicle components. Originating in the car and heavy-duty truck industry in the United States, it is now widely used in other parts of the world.

2025年2月15日 · Any message sent on the CAN bus must follow a predefined frame format with a specific, limited length. Any node connected to the network can transmit a new frame as soon as the bus is idle. However, for a transmission to be valid, all nodes in the network must simultaneously accept the frame’s consistency.

In many ways, J1939 is similar to the older J1708 and J1587 standards, but J1939 is built on CAN. The physical layer (J1939/11) describes the electrical interface to the bus. The data link layer (J1939/21) describes the rules for constructing a message, accessing the bus, and detecting transmission errors.

2021年11月10日 · J1939是一种支持 闭环控制 的在多个ECU之间高速通信的网络协议冈。 主要运用于载货车和客车上。 它是以CAN2.0为网络核心。 表1介绍了CAN2.0的标准和扩展格式，及J1939协议所定义的格式。 表2则给出了J1939年的一个协议报文单元的具体格式。 可以看出，J1939标识符包括:PRIORTY (优先权位)；R (保留位)；DP (数据页位)；PDU FORMAAT (协议数据单元)；PDU SPECIFIC (扩展单元)和SOURCE ADDRESS (源地址)。 而报文单元还包括64 …

2024年12月11日 · J1939 is a higher-level CAN communication protocol used in heavy-duty vehicles and industrial equipment, created for the exchange of information between electronic control units (ECUs) within a vehicle's network. It is part of the broader SAE (Society of Automotive Engineers) standard and is based on the CAN (Controller Area Network) bus.

SAE J1939 （以下简称J1939）是美国汽车工程协会（SAE）的推荐标准，也是CAN通讯开发常用的协议，用于为中重型道路车辆上电子部件间的通讯提供标准的体系结构。它由“卡车与大型客车电气与电子委员会”（Track & Bus Electrical & Electronics Committee）下属的“卡车与 ...

Message Checksum is used to verify the signal path from the transmitting device to the receiving device. The checksum is calculated using the first 7 data bytes, and it is calculated as follows: 3. Getting started. When the sensor is turned on, it sends an Address Claimed message according to PGN60928 (EEFFh). The message is composed of:

SAE J1939 is a protocol for shaping the CAN-bus message in a specific way that suits industrial vehicles such as tractors, machinery, trucks and more.

1 天前 · SAE J1939 is a high-level protocol that operates on the Controller Area Network (CAN) bus. It was developed by the Society of Automotive Engineers (SAE) to serve as a standardized method for communication and diagnostics across different ECUs in …