Training Center of After-Sales Department Chery International
1. Vehicle communication system
9
CAN standard data frame format
SOF Mark the starting of a data frame, used for synchronization
ID Determine the arbitration priority level of the message. The lower the ID value is, the
higher the priority level
RTR Used to distinguish the data frame and remote frame (Data frame: RTR=0; remote frame:
RTR=1)
IDE Used to distinguish standard frame and expansion frame (standard frame: IDE=0;
expansion frame: IDE=1)
R Reversed position 0
DLC Including 4 bits, representing the number of bytes containing data in the data field
Data Field With 0-8 bytes, determined by DLC, containing the information contained in CAN data
frame
CRC Used for CRC verification
DEL Identify CRC sequence
ACK Determine that the message has been correctly received by at least one node
EOF Means the ending of data frame
Frame
start
Arbitrati
on field
Control
field
Data
field
CRC
field
ACK
field
Frame
end
1. CAN-bus
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