length RENAULT SCENIC 2008 J84 / 2.G Electrical Equipment - Multiplexing Workshop Manual

MULTIPLEXING
Fault finding - Features
88B - 8
88B
V4 MR-372-J84-88B050$400_eng.mif
MULTIPLEXING
Fault finding - Features
To improve the performances of vehicles, more
computers are needed to share more information in
order to achieve optimal operation.
With multiplexing, numerous signals can be sent from
one computer to several others via a single electrical
connection.
Solution without multiplexing
Example: each computer would have to have its own
electrical connection to deal with vehicle speed signals
coming from the ABS. The number of connections
increases when there are more signals to be
communicated.Solution with multiplexing
In this instance, the vehicle speed signal is distributed
from the ABS computer to as many computers as
require it on a single electrical connection. All other
signals are transmitted via this connection as well.
Thus there is only one connection regardless of the
number of signals to be exchanged.
Advantages of multiplexing
●Reduction in costs as there is a reduction in
wire length and there are fewer connectors.
●Less wiring,
●Increased reliability due to there being fewer
connectors.
●Easier to locate a faulty component in some
cases.
Multiplex operation
The operation of a multiplex network can be compared
to an underground line which transports a number of
passengers. All the passengers use the same line
even though they get on and off at different points and
they take different trains depending on when they
started their journeys.
The multiplex network operates in a very similar way.
MR-372-J84-88B050$400_eng.mif