ELM327LP datasheet(2/94 Pages) ELM

2 / 94 page

ELM327L

Elm Electronics – Circuits for the Hobbyist

www.elmelectronics.com

2 of 94

ELM327L DSA

Contents

The Basics

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

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

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

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

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

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

ELM327L Unused Pins................................................................ 6

ELM327L Absolute Maximum Ratings......................................... 7

ELM327L Electrical Characteristics............................................. 7

Using the ELM327

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

Communicating with the ELM327................................................ 9

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

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

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

Reading the Battery Voltage...................................................... 30

OBD Commands........................................................................ 31

Talking to the Vehicle.................................................................32

Bus Initiation...............................................................................34

Interpreting Trouble Codes........................................................ 35

Resetting Trouble Codes........................................................... 36

Quick Guide for Reading Trouble Codes................................... 36

Selecting Protocols.................................................................... 37

OBD Message Formats..............................................................39

Setting the Headers................................................................... 40

Multiline Responses................................................................... 43

CAN Message Types................................................................. 45

Multiple PID Requests................................................................46

Response Pending Messages................................................... 46

CAN Receive Filtering - the CRA command.............................. 47

Using the CAN Mask and Filter..................................................48

Monitoring the Bus..................................................................... 49

Restoring Order..........................................................................50

Advanced Features

Using Higher RS232 Baud Rates...............................................51

Setting Timeouts - the AT ST and AT AT Commands............... 53

SAE J1939 Messages................................................................54

Using J1939............................................................................... 56

The FMS Standard.....................................................................59

The NMEA 2000 Standard......................................................... 60

Periodic (Wakeup) Messages.................................................... 60

Altering Flow Control Messages................................................ 61

Using CAN Extended Addresses............................................... 62

CAN Input Frequency Matching................................................. 63

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