ELM329LP datasheet(2/87 Pages) ELM

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ELM329L

Elm Electronics – Circuits for the Hobbyist

www.elmelectronics.com

2 of 87

ELM329L DSA

The Basics

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

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

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

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

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

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

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

Absolute Maximum Ratings......................................................... 7

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

Using the ELM329

Overview...................................................................................... 9

Communicating with the ELM329................................................ 9

AT Commands........................................................................... 11

AT Command Summary.............................................................11

AT Command Descriptions........................................................ 13

Reading the Battery Voltage...................................................... 27

OBD Commands........................................................................ 28

Talking to the Vehicle.................................................................29

Interpreting Trouble Codes........................................................ 31

Resetting Trouble Codes........................................................... 32

Quick Guide for Reading Trouble Codes................................... 32

Selecting Protocols.................................................................... 33

OBD Message Formats..............................................................34

Setting the Header / ID Bits........................................................36

ISO 15765-4 Message Types.................................................... 38

Multiline Responses................................................................... 39

Multiple PID Requests................................................................40

Receive Filtering - the CRA command.......................................41

Using the Mask and Filter.......................................................... 42

Monitoring the Bus..................................................................... 43

Mixed ID (11 and 29 bit) Sending...............................................44

Restoring Order..........................................................................45

Advanced Features

Using Higher RS232 Baud Rates...............................................46

Setting Timeouts - the AT ST and AT AT Commands............... 48

SAE J1939 Messages................................................................49

Using J1939............................................................................... 51

The FMS Standard.....................................................................55

The NMEA 2000 Standard......................................................... 55

Periodic (Wakeup) Messages.................................................... 56

Altering Flow Control Messages................................................ 57

Using CAN Extended Addresses............................................... 58

CAN Input Frequency Matching................................................. 59

CAN (Single Wire) Transceiver Modes...................................... 60

Contents

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