AEMZP0BA - EPS-AC0 - User Manual Page - 31/95
8.6 Installation of a CAN Communication System
4 CAN stands for Controller Area Network. It is a communication protocol for real time
control application. CAN operates at data rate of up to 1 Megabits per second.
It was invented by the German company Bosch to be used in the car industry to
permit communication among the various electronic modules of a vehicle,
connected as illustrated in the figure below:
The best cable for can connections is the twisted pair; if it is necessary to increase
the immunity of the system to disturbances, a good choice would be to use a cable
with a shield connected to the frame of the truck. Sometimes it is sufficient a simple
double wire cable or a duplex cable not shielded.
In a system like an industrial truck, where power cables carry hundreds of Ampere,
there are voltage drops due to the impedance of the cables, and that could cause
errors on the data transmitted through the can wires.
U The eps-ac0 drains low level of current and so low section cables (4 mm
2
) are
adopted for the power connections. This could be a drawback: in fact, a low
section cable has higher reactance (impedance) than a wide section cable. As
a consequence the noise generated on the minus battery cable, by the CAN
lines switching, will be a wide amplitude spike. So, when it is possible, we
suggest to use a (as short as possible) cable of a wide section for the minus
battery connection, even for the eps-ac0 and the other low current units in the
system.
U VERY IMPORTANT: The eps-ac0 has the 120 ohms termination resistance
aboard.
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