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Development of the CAN bus started in 1983 at Robert Bosch GmbH. Bosch published several versions of the CAN specification and the latest is CAN 2. A is for the standard format with an 11-bit identifier, and part B is for the extended format with a 29-bit identifier. A CAN device that uses 11-bit identifiers is commonly called CAN 2. 0A and a CAN device that uses 29-bit identifiers is commonly called CAN 2. ISO 11898-1 which covers the data link layer, and ISO 11898-2 which covers the CAN physical layer for high-speed CAN. In 2012, Bosch released CAN FD 1.

0 or CAN with Flexible Data-Rate. This specification uses a different frame format that allows a different data length as well as optionally switching to a faster bit rate after the arbitration is decided. CAN FD is compatible with existing CAN 2. 0 networks so new CAN FD devices can coexist on the same network with existing CAN devices. The OBD-II standard has been mandatory for all cars and light trucks sold in the United States since 1996. The EOBD standard has been mandatory for all petrol vehicles sold in the European Union since 2001 and all diesel vehicles since 2004. Traditionally, the biggest processor is the engine control unit.

CAN bus to determine whether the engine can be shut down when stationary for improved fuel economy and emissions. CAN bus to determine if the vehicle is stopped on an incline. Parking assist systems: when the driver engages reverse gear, the transmission control unit can send a signal via the CAN bus to activate both the parking sensor system and the door control module for the passenger side door mirror to tilt downward to show the position of the curb. The CAN bus also takes inputs from the rain sensor to trigger the rear windscreen wiper when reversing. CAN bus to the ABS module to initiate an imperceptible application of the brakes whilst driving to clear moisture from the brake rotors.

Some high performance Audi and BMW models incorporate this feature. Sensors can be placed at the most suitable place, and their data used by several ECUs. CAN for non-critical subsystems such as air-conditioning and infotainment, where data transmission speed and reliability are less critical. The CAN bus protocol has been used on the Shimano DI2 electronic gear shift system for road bicycles since 2009, and is also used by the Ansmann and BionX systems in their direct drive motor. The CAN bus is also used as a fieldbus in general automation environments, primarily due to the low cost of some CAN controllers and processors. Manufacturers including NISMO aim to use CAN bus data to recreate real-life racing laps in the videogame Gran Turismo 6 using the game’s GPS Data Logger function, which would then allow players to race against real laps. CAN bus to facilitate communication between servos and microcontrollers in the prosthetic arm.

Teams in the FIRST Robotics Competition widely use CAN bus to communicate between the roboRIO and other robot control modules. The CAN bus protocol is widely implemented due to its fault tolerance in electrically noisy environments such as model railroad sensor feedback systems by major commercial Digital Command Control system manufacturers and various open source digital model railroad control projects. Shearwater Research have implemented the protocol as DiveCAN to use integrating their dive computers into Diving rebreathers from various manufacturers. This article may require cleanup to meet Wikipedia’s quality standards. The specific problem is: This largely overlaps with the Layers section.

Two or more nodes are required on the CAN network to communicate. All nodes are connected to each other through a physically conventional two wire bus. This bus uses differential wired-AND signals. High-speed CAN signaling drives the CANH wire towards 3. 5 V and the CANL wire towards 1. Receivers consider any differential voltage of less than 0.