Can line
Function
It allows communication between the Marelli injection ECU and the instrument panel.
Operation / operating principle
CAN SYSTEM ADVANTAGES
A CAN (controller Area network) line is a connection among the vehicle several electronic devices,
organised as a computer network (Internet). The CAN network has greatly simplified the electrical sys-
tem layout and consequently, its complexity. With this communication line, needless duplication of
several sensors present on the motorbike has been obviated. The sensor signals are shared by the two
electronic elaboration units (instrument panel and control unit).
•
Cable number reduction: The CAN line travels through a twisted cable to several nodes.
•
These nodes can also isolate the errors without causing a system breakdown (FaultsCon-
fination).
•
Immunity to interference: the signal travels through two cables and the signal reading is
differential (voltage difference between the two signals on both cables). If the two signals
are disturbed by an external factor, their difference remains unaltered.
•
Communication speed: messages travel at a speed of 250 kbps (data arrive at nodes every
20 ms, i.e. 50 times/second).
CAN PROTOCOL (CONT. NETWORK AREA)
The communication protocol is CSMA/CD (Carrier Sense Multiple Access w/ Collision Detection).
In order to transmit, every nod must first check that the BUS (the connection among all devices) is free
before attempting to send a message with BUS (Carrier Sense).
If during this period there is no activity on BUS, every nod has the same chance to send a message
(Multiple Access). If two nodes start transmitting simultaneously, the nodes recognise the "colli-
sion" (Collision Detection) and initiate an exchange action based on message priority (messages remain
unaltered during exchange and there is no delay for high priority messages).
CAN protocol is based on messages and not on addresses. The message itself is divided into several
parts (frames), each of which has a meaning: message priority, data contained, error detection, recep-
tion confirmation, etc.
Every network nod receives all the messages sent through the BUS (with reception confirmation or error
messages) and each nod decides if the message is to be processed or rejected. Besides, every nod
can request information from the other nodes (RTR = Remote Transmit Request).
Level in wiring diagram:
CAN line
Electrical characteristics:
•
between PIN 66 and 80 of the control unit: approximately 130 Ohm
RSV4 Factory a-PRC
Electrical system
ELE SYS - 243
Summary of Contents for RSV4 Factory a-PRC 2009
Page 1: ...SERVICE STATION MANUAL 898952 RSV4 Factory a PRC ...
Page 4: ......
Page 6: ...INDEX OF TOPICS CHARACTERISTICS CHAR ...
Page 52: ...INDEX OF TOPICS SPECIAL TOOLS S TOOLS ...
Page 60: ...INDEX OF TOPICS MAINTENANCE MAIN ...
Page 84: ...INDEX OF TOPICS TROUBLESHOOTING TROUBL ...
Page 94: ... 7 REPLACE THE STARTER BUTTON COMPONENT END Troubleshooting RSV4 Factory a PRC TROUBL 94 ...
Page 95: ...INDEX OF TOPICS ELECTRICAL SYSTEM ELE SYS ...
Page 249: ...INDEX OF TOPICS ENGINE FROM VEHICLE ENG VE ...
Page 270: ...INDEX OF TOPICS ENGINE ENG ...
Page 387: ...INDEX OF TOPICS POWER SUPPLY P SUPP ...
Page 398: ...INDEX OF TOPICS SUSPENSIONS SUSP ...
Page 436: ...INDEX OF TOPICS CHASSIS CHAS ...
Page 460: ...INDEX OF TOPICS BRAKING SYSTEM BRAK SYS ...
Page 472: ...INDEX OF TOPICS COOLING SYSTEM COOL SYS ...
Page 483: ...INDEX OF TOPICS BODYWORK BODYW ...