chapter 5000
page 25
1,2 - 2,0 t A.C.
SERVICE MANUAL
Electric
036-0410-07
Controller Area N etwork
The CAN BUS technology is a way to assemble the electronic parts of the machines. It has been designed to avoid
the enormous quantity of cables that normally are used to connect two or more electric components. For example,
in case you want to connect all potentiometers to control the distributor, it is necessary to fix a lot of wires with
consequent reduction of space. Normally a cable in an electric installation is used for only one function: either
positive, or negative, or signal.
In order to avoid the above problem the NEW TECHNOLOGY is used for saving in space given that all the
information go only through two cables and they are decoded by microchips located in different parts of the truck.
One of the greatest advantages is that all microchips can communicate with each other and control functions which
work contemporaneously in a short time.
The CAN transfers all data giving priority to the most important signals.
The CAN is composed of four cables: two for the feeding and two for the signals.
R (red cable) +24Volt
L (blue cable) Negative
AN (light blue/ black cable) CAN H (high)
HG (grey/ yellow cable) CAN L (low)
It is necessary to have two cables for the feeding given that the microchips are not fed.
BUS: In electronics and computer science it indicates a set of wires connecting several microchips,
thus allowing information exchange within the circuit.
BIT: Figure of the binary numeration that can have only two values: 1 (high) - 0 (low).
In computer science it defines the information unit. The bit/sec. defines the capacity of a channel,
that is the quantity of information which can be transmitted through the channel in one second.
CAN - BUS DESCRIPTION
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