Controller area network (CAN) message

Fig 1: Identifying Controller Area Network Message

Courtesy of VOLVO CARS OF NORTH AMERICA.

The message consists of the following components:

• Identifier ("flag"), which indicates the message identity and prioritisation
• 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.