Mazda 2004 RX-8, Особенности сервиса

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CONTROL SYSTEM
09–40–3
09–40
Time Division Multiplex
•
For information exchange between electrical modules in a conventional system, a wire connection was
necessary for each information signal. However, by sending different signals at varying times over one
channel, it is possible to send a large amount of information via a small harness.
•
In the conventional, non-multiplex system, in order to control the illumination of five bulbs, one switch and one
channel was necessary for each bulb. For bulbs B and C to illuminate, switches B and C must be ON and
electricity must flow through the channel. With the time multiplex system, this can be done through one
channel. The channel is comprised of five data signal transmitters which transmit either a “0” or “1” signal to
indicate whether a bulb turns ON or OFF. For example, to illuminate bulbs B and C, transmitters B and C
transmit a “1” and transmitters A, D, and E transmit a “0”. When the receiver receives these signal, bulbs B and
C illuminate.
Vehicle CAN System
•
By rearranging the multiple signal, common information between the CAN system-related modules is
transmitted and received through the multichannel.
•
The signal transmitted by one CAN system-related module is sent through the multichannel to all the CAN
system-related modules, but only the concerned module(s) receives the signal and performs the appropriate
operation (ex. light illumination, fan operation).
A
0
0
0
1
1
0
0
0
1
1
0
0
0
1
1
0
0 0 1 1 0
0
0
1
1
0
0
0
1
1
B
C
D
E
A
B
C
D
E
A
A B C D
0=OFF
1=ON
E
B
C
D
E
A
B
C
D
E
NON-MULTIPLEX SYSTEM TIME DIVISION MULTIPLEX
SYSTEM
EACH SIGNAL IS TRANSMITTED
ONE BY ONE THROUGH THE
CHANNEL AS IT IS RECEIVED. EACH SIGNAL IS OUTPUT ONE
BY ONE AS IT IS RECEIVED FROM
THE CHANNEL.
DATA
A6A8111T005
CONVENTIONAL
SYSTEM
ELECTRICAL
MODULE ELECTRICAL
MODULE
ELECTRICAL
MODULE
CAN SYSTEM-
RELATED
MODULE CAN SYSTEM-
RELATED
MODULE
CAN SYSTEM-
RELATED
MODULE
CAN SYSTEM
A6A8111T006