CAN bus: Difference between revisions

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The [https://en.wikipedia.org/wiki/CAN_bus Controller Area Networks] bus standards describe a two-wire, synchronized (but clockless), broadcast-only system designed for vehicles.
The [https://en.wikipedia.org/wiki/CAN_bus Controller Area Networks] bus standards describe a two-wire, serial, multi-master, synchronized (but clockless), broadcast-only system designed for vehicles. CAN is one of the mandated transports for [https://en.wikipedia.org/wiki/On-board_diagnostics ODB-II] on-board diagnostics, and is required in all US vehicles since 2008. CAN distance decreases with bit rate, but at low rates can run to the kilometers.
 
==Standards==
* CAN-1 (1986): Original Bosch protocol
* ISO 11519 (1991):
* CAN-2.0 (1991): Bosch update, later standardized by ISO
** CAN-2.0A (ISO 11591, 1994): 11-bit identifiers, up to 250Kbit/s (CAN-Lo, "Basic CAN")
** CAN-2.0B (ISO 11898, 2003, 2015): 29-bit identifiers, up to 1Mbit/s (CAN-High, "Full CAN")
* ISO 11898-1: Data link layer
* ISO 11898-2: High-speed physical layer
* ISO 11898-3: Low-speed physical layer
* [https://en.wikipedia.org/wiki/CAN_FD CAN-FD] (2012): Bosch extension to CAN-2.0 for up to 64B messages + better CRC
* [https://en.wikipedia.org/wiki/ISO_15765-2 ISO 15765-2] (2016): "Road vehicles: Diagnostic communication over CAN" ISO-TP L3/L4 for larger (up to 4095B) packets, 15Mbit/s

Revision as of 22:09, 16 May 2019

The Controller Area Networks bus standards describe a two-wire, serial, multi-master, synchronized (but clockless), broadcast-only system designed for vehicles. CAN is one of the mandated transports for ODB-II on-board diagnostics, and is required in all US vehicles since 2008. CAN distance decreases with bit rate, but at low rates can run to the kilometers.

Standards

  • CAN-1 (1986): Original Bosch protocol
  • ISO 11519 (1991):
  • CAN-2.0 (1991): Bosch update, later standardized by ISO
    • CAN-2.0A (ISO 11591, 1994): 11-bit identifiers, up to 250Kbit/s (CAN-Lo, "Basic CAN")
    • CAN-2.0B (ISO 11898, 2003, 2015): 29-bit identifiers, up to 1Mbit/s (CAN-High, "Full CAN")
  • ISO 11898-1: Data link layer
  • ISO 11898-2: High-speed physical layer
  • ISO 11898-3: Low-speed physical layer
  • CAN-FD (2012): Bosch extension to CAN-2.0 for up to 64B messages + better CRC
  • ISO 15765-2 (2016): "Road vehicles: Diagnostic communication over CAN" ISO-TP L3/L4 for larger (up to 4095B) packets, 15Mbit/s