Philips PC Card Kvaser LAPcan Bedienungsanleitung

About CAN

CAN (Controller Area Network)

The CAN protocol is an ISO standard (ISO 11898) for serial data communication. The protocol

was developed aiming at automotive applications. Today CAN has gained widespread use and

is used in industrial automation as well as in automotives and mobile machines.

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There are a number of good reasons for why the CAN protocol is the right choice:

Mature standard

The CAN protocol has been around for more than 20 years (since 1986). There are now a lot of

CAN products and tools available on the open market.

Hardware implementation of the protocol

The CAN protocol is implemented in silicon. This makes it possible to combine the error

handling and fault confinement facilities of CAN with a high transmission speed. The method

used for distributing messages to the right receivers contributes to gaining a good use of the

available band width.Simple transmission medium. A common transmission medium is a twisted

pair of wires. A CAN system can also work with just one wire. In some applications different

kinds of links, optical links or radio links, are better suited. Though there is a transmission

hardware standard (twisted pair), it is not uncommon to use different transmission solutions

depending on system requirements.

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Excellent error handling

The error handling of CAN is one of the really strong advantages of the protocol. The error

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About CAN

detection mechanisms are extensive, and the fault confinement algorithms are well developed.

The error handling and retransmission of the messages is done automatically by the CAN

hardware.

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Fine fault confinement

A faulty node within a system can ruin the transmission of a whole system, e.g. by occupying all

the available band width. The CAN protocol has a built-in feature that prevents a faulty node

from blocking the system. A faulty node is eventually excluded from further sending on the CAN

bus.

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Distributed Control Systems

The CAN protocol is a good basis when designing Distributed Control Systems. The CAN

arbitration method ensures that each CAN node just has to deal with messages that are

relevant for that node.

A Distributed Control System can be described as a system where the processor capacity is

distributed among all nodes in a system. The opposite can be described as a system with a

central processor and local I/O-units.

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