Controller area network (CAN) message

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Fig 1: Controller Area Network Message

Courtesy of VOLVO CARS OF NORTH AMERICA.

The message consists of the following components:

Identifier ("flag"), which indicates the message's identity and priority.
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 CAN-message is called a frame.