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What is the LIN message format?

The LIN telegram transmission starts with a dominant level of 13-bit that is transmitted by the master to identify the start of the frame. In an alternate sequence of 1-0, the master transmits a sync field that can be used for clock synchronization by slave node.

The identifier is transmitted by the master after the sync field with a 6-bit long message ID and a parity field of 2-bit. The message ID is in addition to ID that contains an optional message with length information of 2, 4, or 8 data bytes. Message ID that is used as an address by the slave can now transmit data bytes in the range of (1-8) followed by a checksum.

The classic checksum is used by the protocol version 1.3 whereas the 2.0 version is used for enhancing the checksum.

2.0, the LIN specification is defined as an event-triggered frame in addition to an unconditional frame. Due to this reason, event-triggered are defined as several frame IDs within the network. If such a frame is requested by the master device, a corresponding slave starts to transmit data. Due to this occurrence, a frame ID is transmitted by the slave, a standard frame within the first data byte, assigned to this information. If an event is triggered or a collision occurs then it can not be identified correctly. Individually the information will then be transmitted by using a standard frame.

Source:- Elektronik Praxis

 

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