SAE J1939 defines five layers in the seven-layer OSI network model, and this includes the Controller Area Network (CAN) ISO 11898 specification (using only the 29-bit/"extended" identifier) for the physical and data-link layers. Under J1939/11 and J1939/15, the data rate is specified as 250 kbit/s, with J1939/14 specifying 500 kbit/s.

SAE J1939 Standards Collection Exclusively on the Web Content The SAE J1939 Standards Collection includes the following full-text documents: J1939 Recommended Practice for a Serial Control & Communications Vehicle Network J1939/01 Recommended Practice for Control And Communications Network for On-Highway Equipment J1939/11 Physical Layer 250k ...

2023年11月8日 · J1939是由美国汽车工程师学会（Society of Automotive Engineers，简称SAE）开发的一系列标准，其目的是使不同制造商的车辆和设备能够在同一个网络上进行通信，实现数据交换和协作。 J1939是基于CAN总线技术的，主要的通信速率是250Kbps或500Kbps，通常采用广播通信的方式，同时也支持点对点通信。 在20世纪后半叶，随着商用车辆、重型机械设备等对多功能化和电子化的需求急剧增加，其内部不同子系统之间需要进行高效的通信和协作来实 …

2024年1月2日 · J1939是由美国汽车工程师学会（Society of Automotive Engineers，简称SAE）开发的一系列标准，其目的是使不同制造商的车辆和设备能够在同一个网络上进行通信，实现数据交换和协作。 J1939是基于CAN总线技术的，主要的通信速率是250Kbps或500Kbps，通常采用广播通信的方式，同时也支持点对点通信。 2.1. J1939诞生的背景. 在20世纪后半叶，随着商用车辆、重型机械设备等对多功能化和电子化的需求急剧增加，其内部不同子系统之间需要进行高效的 …

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.

SAE J1939 has a broad acceptance in the truck domain, and consists of several doc-uments describing the layers of the communication protocol from the physical layer to diagnostics and the application layer. [2, SAE J1939-21] describes the data link and transport layer, which includes two transport protocol variants:

2024年11月5日 · J1939 Transport Layer（J1939Tp）模块是AUTOSAR中的一个重要部分，它处理跨多个CAN（Controller Area Network）报文的数据传输，这些数据被称为多报文传输。 数据分段和重组：J1939协议规定的单个CAN帧的数据长度是8字节，J1939Tp负责将较大的数据消息划分为多个8字节的小分段在CAN网络上传输，并在接收方将这些小分段重新组装成完整的消息。 传输协议管理：J1939Tp负责管理传输过程，包括初始化、数据发送和接收、重发机制以及错误处 …

J1939 comprises the following sub standards: J1939 – Recommended Practice for a Serial Control & Communications Vehicle Network; J1939/11 – Physical Layer – 250k bits/s, Shielded Twisted Pair; J1939/13 – Off-Board Diagnostic Connector; J1939/21 – Data Link Layer; J1939/31 – Network Layer; J1939/71 – Vehicle Application Layer

5 天之前 · J1939 is more than just a data transmission standard—it encompasses complex rules for address claiming, transport protocols, and message prioritization. ... This adds another layer of complexity when trying to extract meaningful information from raw CAN data. Security is another emerging concern. As vehicles become more connected, the need ...

J1939 is a 'higher-layer protocol' that adds a specific language to enable more advanced communication. Other CAN based protocols exist like OBD2, UDS and CANopen. To better understand J1939, we will explore some of the sub standards (or chapters) in the sections below.