CAN Bus - Standards

Standards

There are several CAN physical layer standards:

  • ISO 11898-1: CAN Data Link Layer and Physical Signalling
  • ISO 11898-2: CAN High-Speed Medium Access Unit
  • ISO 11898-3: CAN Low-Speed, Fault-Tolerant, Medium-Dependent Interface
  • ISO 11898-4: CAN Time-Triggered Communication
  • ISO 11898-5: CAN High-Speed Medium Access Unit with Low-Power Mode
  • ISO 11898-6: CAN High-speed medium access unit with selective wake-up functionality
  • ISO 11992-1: CAN fault-tolerant for truck/trailer communication
  • ISO 11783-2: 250 kbit/s, Agricultural Standard
  • SAE J1939-11: 250 kbit/s, Shielded Twisted Pair (STP)
  • SAE J1939-15: 250 kbit/s, Unshielded Twisted Pair (UTP) (reduced layer)
  • SAE J2411: Single-wire CAN (SWC)

ISO 11898-2 uses a two-wire balanced signalling scheme. It is the most used physical layer in car powertrain applications and industrial control networks.

ISO 11898-4 standard defines the time-triggered communication on CAN (TTCAN). It is based on the CAN data link layer protocol providing a system clock for the scheduling of messages.

SAE J1939 standard uses a two-wire twisted pair, −11 has a shield around the pair while −15 does not. SAE 1939 is widely used in heavy-duty (truck) and autobus industry as well as in agricultural & construction equipment.

ISO 11783-2 uses four unshielded twisted wires; two for CAN and two for terminating bias circuit (TBC) power and ground. This bus is used on agricultural tractors. This bus is intended to provide interconnectivity with any implementation adhering to the standard.

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