DEK高级培训资料 - 第83页
Why CAN ? • Reduced wiring • Future p roof – ease of addin g options • CAN Open sp ecificat ion allows mult iple Issue 2: July 2007 • CAN Open sp ecificat ion allows mult iple manufac tures to be sourced • Short reac tio…
Control Area Network
(CAN Bus)
Issue 2: July 2007
(CAN Bus)
Why CAN ?
•
Reduced wiring
•
Future proof – ease of adding options
•
CAN Open specification allows multiple
Issue 2: July 2007
•
CAN Open specification allows multiple
manufactures to be sourced
•
Short reaction times for priority commands
•
Fault analysis built into architecture –
ability to recover
•
Simplicity of interface (mechanical and
electrical)
CAN Features
• Uses Line topology partcipants are connected parallel via
bus(DEK)
•
Data transmission speed of 500 Kbit/sec (DEK)
•
Data exchange:Each device (Node) may send data if bus
Issue 2: July 2007
•
Data exchange:Each device (Node) may send data if bus
is not occupied
• COB’s are read by all Nodes but any action is only
performed by the addressed Node(s)
•
A COB-ID (COB identifier) determines the receiving
Nodes address and the priority of the message