Lin protocol

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1. LIN (Local Interconnected Network)

Fundamentals ofthe LIN Protocol

2. Communication Principle
Message Format

Scheduling

Message Types

Data Assurance

Miscellaneous

3. Centrally Controlled Message Distribution System

4. Communication Principle

Message Format
Scheduling
Message Types
Data Assurance

Miscellaneous

5. Message Header

a The Token is referred to as the Message Header
a The Message Header is sent by the Master Task
a The Message Header Is used for synchronization

a The Message Header includes the identifier

Message Header —

6. Message Response

a The Message Response Is sent by a Slave Task
a The Message Response Is comprised of the data and checksum

a Classic checksum over data field (LIN 1.x)
a Enhance ksum over data field and ID field (LIN 2.

Message Response

| Data Byte 1 —] + Data Byte n

8. State Flow Charts

9. LIN Message (Nominal)

LIN Message

= (W. +N

10+ (Noss + 1) + &

10. Transmission of a LIN Message

à A time reserve of up to 40% Is given for transmission of a LIN

Header

EN su,

À pe A

11. Scheduling

Message Types

12. Principle of Scheduling

2 The LIN Master controls communication in the LIN network; il
does this by placing Message Headers with the specified
Identifiers on the LIN bus at the specified send times

2 Send times and identifiers are defined by the LIN Schedule; the
send times must be selected so that the transmission of the LIN
messages is guaranteed

St

Frome Me) nom > teen

13. Organization of the LIN Schedule

2 The LIN Schedule Is organized in Mint
Slots (t, t,

LIN Schedule (tn aa)

a An adequate number of Mini Slots E
must be provided to guarant TES
transmission of a LIN me Sie DES

14. Communication Principle

Message Format

Scheduling

15. Message Types

nconditional Frames (ID 0-59)
a One Message Respo je Header
à Message Header is always

3 Diagnostic Frames (ID 60-61)
2 Master Request Frame (ID=60, ID=0x3C)
a Slave Ri Frame (ID=61, ID=0x3D)

2 Other Frames (ID 62-63)

a User-defined (1D=62, ID=0x3E)
3 Future extensions (ID=63, ID=0x

17. Unconditional Frames

Schedule LIN Slave LIM Master Ll

Communication cycle

18. Diagnostic Frames

à Slave Response Frame (II

ge Header is sent by the LIN Master

ge Response is sent by the relevant LIN Slav.
jonse and Configuration S

a Mes:
à Mess
à Used for: Diagnos

LIN Slave 1 LIN Master LIN Slave 2

Diagnostic Schedule
Frame + Header ID =0%
SRE tesina

20. Communication Principle
Message Format

Scheduling

Message Types

Data Assurance

Miscellaneous

21. Data Assurance

Each LIN Slave monitors its operating state and creates a status
report

The status report Is sent periodically to the LIN Master (LIN 2.0)
Monitoring by error detection mechanisms

a Parity
a Checksum

LIN messages detected as corrupt are rejected

Error handling is not part of the LIN specification

Error handling must be defined separately

22. Communication Principle

Message Format
Scheduling
Message Types
Data Assurance

Miscellaneous

23. LIN Fact Sheet

Data rates up to 20 KBit/sec
UART interface

Delegated Token Method

Deterministic communication

Message distribution (Broadcast)

Short messages (max. 8 data bytes)

Simple transmission checking (parity, checksum)

Status Management
Network Management

24. LIN on the Internet

a Internet

a http .vector-informatik.com/
a ht ‚subbus.org

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