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Vehicle Networks CAN-based Higher Layer Protocols - STI Innsbruck

Vehicle Networks CAN-based Higher Layer Protocols - STI Innsbruck 2025

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The document discusses Vehicle Networks, focusing on CAN-based Higher Layer Protocols (HLPs) essential for interconnecting various vehicle systems from different manufacturers. It outlines the limitations of 'Pure CAN' in large networks and emphasizes the need for HLPs to ensure interoperability, flow control, and effective communication among devices. Key protocols such as ISO TP, TP2.0, CANopen, and SAE J1939 are detailed, highlighting their applications in diagnostics and vehicle operations. The document serves as a comprehensive overview of the structure and functionality of these protocols within automotive networks.

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What is the major difference between J1939 and CAN protocol?

J1939 standards (higher-layer protocol) J1939 is based on CAN, which specifies the physical layer (ISO 11898-2) and data link layer (ISO 11898-1) of the OSI model. Here, CAN is a lower-layer protocol that specifies means of communication like wires and CAN frames - but not a lot more.

Which transport layer protocol is connection based?

The main difference between TCP (transmission control protocol) and UDP (user datagram protocol) is that TCP is a connection-based protocol and UDP is connectionless.

CAN bus protocol J1939?

How does J1939 relate to the CAN bus protocol? The SAE J1939 protocol is a standards collection that defines how ECUs exchange data within heavy-duty vehicles. This flow of information occurs through the CAN bus protocol, which consists of a physical layer and a data link layer.

Is CAN 2.0 B the same as J1939?

The J1939 standard is based on the CAN 2.0B specifications with a baud rate of 250Kb/s. Other than the message identifier, the message structure is the same; however, the CAN specification only supports up to eight bytes of data per message.

What is the difference between J1939 and CAN?

The CAN 2.0 B specification can only transmit single-frame messages, while the J1939 protocol can transmit single- and multiple-frame messages, including dialogue and broadcast. J1939 can pack, send, receive, synthesize, and reorganize messages ing to the multiple-frame data transmission protocol.

What is the difference between J1939 and CANopen protocol?

CANopen: CANopen is used in industrial automation and building automation applications. It is used to connect various devices such as sensors, and programmable logic controllers (PLCs) in manufacturing and automation environments. SAE J1939: SAE J1939 is used in the automotive and heavy-duty vehicle industries.

Vehicle Networks CAN-based Higher Layer Protocols - STI Innsbruck 2025

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