ELM329 查看數據表（PDF） - Elm Electronics

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ELM329

CAN Interpreter

Elm Electronics 

ELM329

Contents

Electrical Information

Using the ELM329

Advanced Features

Design Discussions

Misc

Pin Descriptions........................................................................... 3

Unused Pins.................................................................................5

Absolute Maximum Ratings......................................................... 5

Electrical Characteristics..............................................................6

Overview...................................................................................... 7

Communicating with the ELM329................................................ 7

AT Commands............................................................................. 9

AT Command Summary...............................................................9

AT Command Descriptions........................................................ 11

Reading the Battery Voltage...................................................... 25

OBD Commands........................................................................ 26

Talking to the Vehicle.................................................................27

Interpreting Trouble Codes........................................................ 29

Resetting Trouble Codes........................................................... 30

Quick Guide for Reading Trouble Codes................................... 30

Selecting Protocols.................................................................... 31

OBD Message Formats..............................................................32

Setting the Header / ID Bits........................................................34

ISO 157645-4 Message Types.................................................. 36

Multiline Responses................................................................... 37

Receive Filtering - the CRA command.......................................39

Using the Mask and Filter.......................................................... 40

Monitoring the Bus..................................................................... 41

Mixed ID (11 and 29 bit) Sending...............................................42

Restoring Order..........................................................................43

Using Higher RS232 Baud Rates...............................................44

Setting Timeouts - the AT ST and AT AT Commands............... 46

SAE J1939 Messages................................................................47

Using J1939............................................................................... 49

The FMS Standard.....................................................................52

Periodic (Wakeup) Messages.................................................... 53

Altering Flow Control Messages................................................ 54

Using CAN Extended Addresses............................................... 55

CAN (Single Wire) Transceiver Modes...................................... 56

Control Module Operation.......................................................... 56

Low Power Mode....................................................................... 57

Programmable Parameters........................................................ 60

Programmable Parameter Summary......................................... 61

Compatibility with the ELM327...................................................66

Modifications for Low Power Standby Operation....................... 66

Microprocessor Interfaces..........................................................67

Example Applications.................................................................68

Error Messages and Alerts.........................................................72

Outline Diagrams....................................................................... 74

Ordering Information.................................................................. 74

Copyright and Disclaimer........................................................... 74

Index.......................................................................................... 75

ELM329DSB

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