These standards are freely available from Bosch along with other specifications and white papers. 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 2.0B. Part A is for the standard format with an 11-bit identifier, and part B is for the extended format with a 29-bit identifier. The latest is CAN 2.0, published in 1991. īosch published several versions of the CAN specification. Released in 1991, the Mercedes-Benz W140 was the first production vehicle to feature a CAN-based multiplex wiring system. The first CAN controller chips were introduced by Intel in 1987, and shortly thereafter by Philips. The protocol was officially released in 1986 at the Society of Automotive Engineers (SAE) conference in Detroit, Michigan. Frames are received by all devices, including by the transmitting device.ĭevelopment of the CAN bus started in 1983 at Robert Bosch GmbH. For each device, the data in a frame is transmitted serially but in such a way that if more than one device transmits at the same time, the highest priority device can continue while the others back off. It is a message-based protocol, designed originally for multiplex electrical wiring within automobiles to save on copper, but it can also be used in many other contexts. ( November 2020)Ī Controller Area Network ( CAN bus) is a vehicle bus standard designed to allow microcontrollers and devices to communicate with each other's applications without a host computer. Please consider expanding the lead to provide an accessible overview of all important aspects of the article. This article's lead section may be too short to adequately summarize the key points.

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