Origin of the VAN
Created in 1985/1986, developed by PSA/RENAULT, ISO standard (name of the International Standards Organisation) in 1992
First components in 1989
First applications on vehicles in 1993/1994 on CITROEN XM
The length of the data can vary from 0 to 28 bytes
A byte = sequence of eight bits = eight values of 0 or 1
Operation of the VAN
The VAN has bit by bit arbitration on the whole packet
The maximum transmission speed permitted by the standard is 250 000 bits per second (= 250 Kbits/sec.)
The exchanges are of the type: master-slave - multi-master - mixed
Line faults (short circuit, open circuit) are detected
Origins of the CAN
Created in 1980, developed by R.BOSCH, ISO standard (name of the International Standards Organisation) in 1991 (then with modifications in 1993 and 1995)
First components in 1987
First applications on vehicles in 1992 on MERCEDES
Operation of the CAN
The CAN has bit by bit arbitration on the identifier field only
The length of the data can vary from 0 to 8 bytes
The maximum transmission speed permitted by the standard is 1 000 000 bits per second (= 1 Mbits/sec.)
The exchanges were of the multi-master type initially; they can also be of the master-slave type
Line faults (short circuit, open circuit) are detected
Definitions
Master-slave exchange
The management (intelligence of the system) is concentrated in a single piece of equipment called the master, while the other items of equipment (slaves) only control the ancillary functions (conventional sensors and actuators)
The slaves cannot send orders
Multi-master exchange
All the equipment on the network has the intelligence to control complex functions
Смешанный цикл
The network is made up of several items of master and slave equipment