Johnston VM502, Maintenance Manual

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V Range 502
l
652
l
802 Maintenance Manual
MA3:4
Chapter - Electrical System
Engine/Chassis Control
CANbus J1939
CAN stands for Controller Area Network. It represents dedicated wiring that connects the control
units of a vehicle (ECU). For the V Range sweepers the J1939 CANbus connects the auxiliary
engine ECU to the in cab Centre Console allowing control of engine RPM and other engine data to
be exchanged.
The system permits the vehicle’s various on-board electronic systems to instantaneously exchange
huge amounts of data.
It represents a two-way communication system that is widely used in vehicles, mainly due to the
reduction in the number of conductors and the amount of interference.
System CAN - CANOPEN
CANopen is also a CAN based higher layer protocol as is J1939.
It provides a standardized network which can be fully customised with “off the shelf” controllers for
high speed communication with limited wiring required.
It is already used in numerous applications including machine control, maritime and power generation
as well as off-road vehicles.
CANopen used on the roadsweeper application allows for a finite and customized control of the
sweeper, as well as providing clear visual display of operation and data capture to monitor sweeper
use and performance.
CAN Line Setup
The cable used for the ‘CAN’ line fitted on
the vehicle is a twisted pair of cables ( B ).
It has these characteristics in order to
eliminate any electrical disturbance on the
signals.
The sheathing ( A ) is grey in colour.
M02OG-107
JVM (JOHNSTON VISUAL MODULE)