LIN Protocol, Local Interconnect Network

- the protocol used for data exchange within the Local Interconnect Network, enables effective communications without the need for expensive hardware and systems.

The LIN protocol is an essential element of the overall operation of the LIN Bus system, enabling the various devices to communicate effectively with each other.

The LIN Bus uses a protocol that is similar to that used in Computer Com or SCI ports using RS-232.

LIN protocol basics

The LIN Bus is a serial network that has one master and up to sixteen slaves.

Messages are always initiated by the master and one slave replying to a given message identifier as required.

The fact that the master always imitates the messages means that there is no need for any form of collision detection within the LIN protocol as the master has complete control.

Data is sent along the LIN bus in messages which have a selectable length.

The LIN Bus protocol defines the messages, length and format.

  • The LIN master transmits a header that consists of a break signal followed by synchronization and identifier fields.
  • The slaves respond with a data frame that consists of between 2, 4 and 8 data bytes plus 3 bytes of control information.

By Ian Poole

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