Volvo Workshop Manuals
XC90 2.5T AWD L5-2.5L Turbo VIN 59 B5254T2 (2003)
Powertrain Management > Computers and Control Systems > Information Bus > Component Information > Description and Operation > The Controller Area Network (CAN) > Page 4842
Information Bus: Description and Operation
CAN-network (Controller Area Network)
CAN (Controller Area Network) is a standardized system for multiplex-communication. Volvo has developed a new standard for multiplex
That two cables should be used (CAN H and CAN L)
Which voltage levels should be used
What a message should look like
How transfer errors should be handled.
Cables, CAN H and CAN L
The CAN H and CAN L cables must not be confused with HS CAN and LS CAN which are speeds on the Controller area network. CAN H and CAN L
Binary 1 = 2.5 V on both CAN H and CAN L.
Binary 0 = 4 V on CAN H and 1 V on CAN L.
Average voltage level is 2.5V.
Controller area network (CAN) message
The message consists of the following components:
Identifier ("flag"), which indicates the message identity and prioritization
Data information (value, information etc.)
Check sum, used to check that the message has arrived correctly
Stop signal, which indicates that the message has finished.
A complete Controller area message is called a frame.
Conflicts can occur in a network when several control modules wish to send a message at the same time. For example when the driver presses the brake
|[PREV PAGE] [NEXT PAGE]|