Editing CAN bus (section)

== History ==
Development of the CAN [[Bus (computing)|bus]] started in 1983 at [[Robert Bosch GmbH]].<ref name="can-cia">{{cite web| url = http://www.can-cia.org/can-knowledge/can/can-history/| title = CAN History| publisher = CAN in Automation| access-date = 2016-02-25| archive-date = 2018-07-15| archive-url = https://web.archive.org/web/20180715123539/https://www.can-cia.org/can-knowledge/can/can-history/| url-status = dead}}</ref> The protocol was officially released in 1986 at the [[Society of Automotive Engineers]] (SAE) conference in [[Detroit, Michigan|Detroit]], [[Michigan]]. The first CAN controller chips were introduced by [[Intel]] in 1987, and shortly thereafter by [[Philips]].<ref name="can-cia" /> Released in 1991, the [[Mercedes-Benz W140]] was the first production vehicle to feature a CAN-based multiplex wiring system.<ref>{{cite web|title=Mercedes-Benz S-Class W 140.|url=https://www.mercedes-benz.com/en/mercedes-benz/classic/history/mercedes-benz-s-class-w-140/|website=mercedes-benz.com|access-date=27 October 2017|date=23 February 2016|archive-date=10 June 2019|archive-url=https://web.archive.org/web/20190610012852/https://www.mercedes-benz.com/en/mercedes-benz/classic/history/mercedes-benz-s-class-w-140/|url-status=dead}}</ref><ref name=":0">{{cite web|title=CAN in Automation - Mercedes W140: First car with CAN|url=https://can-newsletter.org/engineering/applications/160322_25th-anniversary-mercedes-w140-first-car-with-can/|website=can-newsletter.org|access-date=27 October 2017|language=en}}</ref>

Bosch published several versions of the CAN specification. The latest is CAN 2.0, published in 1991. This specification has two parts. 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. 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. These standards are freely available from Bosch along with other specifications and [[white paper]]s.<ref name=":1">{{cite web|url=http://www.bosch-semiconductors.de/en/automotive_electronics/ip_modules/can_literature_2.html|title=Bosch Semiconductor CAN Literature|access-date=2017-05-31|archive-url=https://web.archive.org/web/20170523083421/http://www.bosch-semiconductors.de/en/automotive_electronics/ip_modules/can_literature_2.html|archive-date=2017-05-23|url-status=dead}}</ref>

In 1993, the [[International Organization for Standardization]] (ISO) released CAN standard ISO 11898, which was later restructured into two parts: ISO 11898-1 which covers the [[data link layer]], and ISO 11898-2 which covers the CAN physical layer for high-speed CAN. ISO 11898-3 was released later and covers the CAN physical layer for low-speed, fault-tolerant CAN. The physical layer standards ISO 11898-2 and ISO 11898-3 are not part of the Bosch CAN 2.0 specification.

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, using the same CAN 2.0 communication parameters. {{As of|2018}}, Bosch was active in extending CAN standards.

The CAN bus is one of five protocols used in the [[on-board diagnostics]] (OBD)-II vehicle diagnostics standard. The OBD-II standard has been mandatory for all cars and light trucks sold in the United States since [[model year]] 1996. The [[on-board diagnostics#EOBD|EOBD]] standard has been mandatory for all petrol vehicles sold in the European Union since 2001 and all diesel vehicles since 2004.<ref>[http://www.obddiag.net/adapter.html ''Building Adapter for Vehicle On-board Diagnostic''] {{Webarchive|url=https://web.archive.org/web/20180514092143/http://www.obddiag.net/adapter.html|date=2018-05-14}}, obddiag.net, accessed 2009-09-09</ref>