ELM327 データシートの表示（PDF） - Elm Electronics

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ELM327

OBD to RS232 Interpreter

Elm Electronics 

ELM327

Contents

ELM327DSJ

The Basics

Description................................................................................... 1

Features....................................................................................... 1

Applications..................................................................................1

Block Diagram..............................................................................1

Connection Diagram.................................................................... 1

Pin Descriptions........................................................................... 4

Unused Pins.................................................................................6

Absolute Maximum Ratings......................................................... 6

Electrical Characteristics..............................................................7

Using the ELM327

Overview...................................................................................... 8

Communicating with the ELM327................................................ 8

AT Commands........................................................................... 10

AT Command Summary.............................................................10

AT Command Descriptions........................................................ 12

Reading the Battery Voltage...................................................... 29

OBD Commands........................................................................ 30

Talking to the Vehicle.................................................................31

Bus Initiation...............................................................................33

Interpreting Trouble Codes........................................................ 34

Resetting Trouble Codes........................................................... 35

Quick Guide for Reading Trouble Codes................................... 35

Selecting Protocols.................................................................... 36

OBD Message Formats..............................................................38

Setting the Headers................................................................... 39

Multiline Responses................................................................... 42

CAN Message Types................................................................. 44

Multiple PID Requests................................................................45

Response Pending Messages................................................... 45

CAN Receive Filtering - the CRA command.............................. 46

Using the CAN Mask and Filter..................................................47

Monitoring the Bus..................................................................... 48

Restoring Order..........................................................................49

Advanced Features

Using Higher RS232 Baud Rates...............................................50

Setting Timeouts - the AT ST and AT AT Commands............... 52

SAE J1939 Messages................................................................53

Using J1939............................................................................... 55

The FMS Standard.....................................................................58

The NMEA 2000 Standard......................................................... 59

Periodic (Wakeup) Messages.................................................... 59

Altering Flow Control Messages................................................ 60

Using CAN Extended Addresses............................................... 61

CAN Input Frequency Matching................................................. 62

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