EMC FLEX BLOG A site dedicated to Automotive EMC Testing for Electronic Modules

As the CAN standard does not include tasks of application layer protocols, such as flow control, device addressing, and transportation of data blocks larger than one message, and above all, application data, many implementations of higher layer protocols were created. Several are standardized for a business area, although all can be extended by each manufacturer. For passenger cars, each manufacturer has its own standard. Among these implementations are:

• ARINC 825 (for the aviation industry)

• CANaerospace (for the aviation industry)

• CAN Kingdom

• CANopen (used for industrial automation)

• CCP / XCP

• DeviceNet (used for industrial automation)

• EnergyBus (used for electrical vehicles)

• GMLAN (for General Motors)

• ISO 15765-4

• ISO 11783 or ISOBUS (agriculture)

• ISO 14229

• SAE J1939 (heavy road vehicles)

• ISO 11992 for heavy trailers

• MilCAN

• CAN bus 10

• NMEA 2000 (marine industry)

• RV-C (used for recreational vehicles)

• SafetyBUS p (used for industrial automation)

• SmartCraft

• Smart Distributed System (SDS)

• VSCP (used for building automation)

Christian Rosu

There are several CAN physical layer and other standards:

•ISO 11898-1: CAN Data Link Layer and Physical Signaling

•ISO 11898-2: CAN High-Speed Medium Access Unit

ISO 11898-2 uses a two-wire balanced signaling scheme. It is the most used physical layer in car

Powertrain applications and industrial control networks.

•ISO 11898-3: CAN Low-Speed, Fault-Tolerant, Medium-Dependent Interface

•ISO 11898-4: CAN Time-Triggered Communication

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.

•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

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.

•ISO 15765-2 also called ISO-TP, is a standard for flow control and handling of messages larger than eight bytes.

•SAE J1939-11: 250 Kbit/s, Shielded Twisted Pair (STP)

•SAE J1939-15: 250 Kbit/s, Unshielded Twisted Pair (UTP) (reduced layer)

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