CAN bus

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CAN bus

(Controller Area Network bus) A rugged, digital serial bus designed for industrial environments. Introduced by Bosch in the mid-1980s for in-vehicle communications, it is used in myriad applications including factory automation, building automation, aircraft and aerospace as well as in cars, trucks and buses. CAN bus replaced bulky wiring harnesses with a two-wire differential cable (the two wires carry inverted voltages to decrease interference).

CAN provides services at layers 1 and 2 of the OSI model and uses a broadcast method for placing frames on the wire somewhat similar to Ethernet. Bus distance is based on speed, ranging from a maximum of 40 meters at 1 Mbps to a maximum of six kilometers at 10 Kbps. At speeds up to 125 Kbps, CAN provides fault tolerance. If one of the two wires is cut or shorted, the other keeps transmitting.

In a vehicle, both low- and high-speed CAN buses are used. For example, window, lighting and seat control only need low speeds, while engine, cruise control and antilock brakes require high speeds. Two or three CAN buses may be used in a vehicle; for example, a high-speed bus may be dedicated only for safety (air bags, seat belt tensioners, etc.).

The Bus Hampers After-Market Installations
The CAN bus has made it challenging to add certain after-market products to a vehicle. In older cars, there were discrete wires for everything, but CAN bus signals are digital frames that have to be analyzed to determine their purpose. For example, taxi meters and many GPS navigation systems need to monitor vehicle speed. If speed pulse is no longer available as a discrete wire, a CAN bus interface, such as the CANM8-NAV unit from Bridgewater Electronics (, can convert speed pulse frames to a speed pulse signal.

CANopen and CiA
Introduced in 1995, CANopen is a high-level application layer protocol that provides services for processes, data and network management. The international organization that governs the CANopen protocol is CAN in Automation (CiA). For more information, visit See automotive systems and automotive Ethernet.
References in periodicals archive ?
The industry's first family of Controller Area Network (CAN) transceivers including various automotive Grade 0 qualified parts, is now available from Microchip Technology Inc.
Locating Wire Short Fault for In-Vehicle Controller Area Network with Resistance Estimation Approach," SAE Int.
For example, the introduction of new in-vehicle networks, such as the Controller Area Network (CAN) currently being incorporated into new light vehicles, will require more advanced diagnostics equipment going forward.
Richard McLaughlin, marketing director of the company, said its research had developed a controller area network system.
The answer according to Bosch, the pioneer of electronic anti-lock brakes, is a system called CAN - Controller Area Network.
FlexRay[TM] is a rapidly emerging standard for in-vehicle networking, superseding current controller area network (CAN) and local interconnect network (LIN) based systems, with an order of magnitude increase in data transfer speeds as well as greater reliability," said Jim Alvernaz, director of the automotive product division at ON Semiconductor.
The new S6J342xxx series supports the Controller Area Network Flexible Data-rate (CAN FD) standard for high-speed, in-vehicle networking, enabling large amounts of data to be exchanged between each CAN node.
Programmer, Eric Evenchick, has developed a device called CANtact that acts as an interface between a computer's USB port and the Controller Area Network bus that serves as the gateway to a vehicle's electronic systems, according to a report by Wired.
The Midspan Bridge acts as a link between the user's Local Area Network (LAN) and the Controller Area Network (CAN), the network that hosts door controllers, alarm input and output panels, etc.
Industrial automation manufacturer Opto 22 announced on Thursday the release of the SNAP-SCM-CAN2B, a high-speed serial communication module for acquiring data from generators, motors, sensors, actuators and other industrial devices connected to a Controller Area Network (CAN).
The lift trucks use controller area network (CAN-bus) communications for precise control of truck functions with fewer electrical components.
AGCO Corporation's ISOBUS FileServer is an ISO-11783 conformant file server available on Implement Controller Area Network (CAN) Bus to provide data storage and retrieval service for all implement Electronic Control Units (ECUs) on the bus.
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