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LIN / SAE J2602 Message Header
message header
synch break
≥ 13 bit
synch field identifier
• The Identifier logically describes the meaning of the message.
• The Identifier is protected with 2 Parity bits.
• There are up to 64 different Identifiers in a LIN system.
ƒ 60 are freely available to a system designer. (0x00 – 0x3B)
ƒ 4 are reserved for special purposes.
(0x3C – 0x3F)
• The master always sends this header, controlling when
messages appear on the bus.
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The message header is sent by the master. The identifier byte is actually protected with a couple of parity bits at the end.
There are up to 64 possible identifiers in a LIN system because the first six bits in the identifier are selectable and the final two bits
are parity bits. Sixty of the 64 possible identifiers are available for general use. Four are reserved for special purposes; these are
3C, 3D, 3E, and 3F.
The master always sends this header information which allows you to have stable clocks and allows the master to control
communications on the bus.
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