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ELM327SM Datasheet(PDF) 2 Page - ELM Electronics

Part # ELM327SM
Description  OBD to RS232 Interpreter
Download  76 Pages
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Manufacturer  ELM [ELM Electronics]
Direct Link  http://www.elmelectronics.com
Logo ELM - ELM Electronics

ELM327SM Datasheet(HTML) 2 Page - ELM Electronics

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ELM327
Elm Electronics – Circuits for the Hobbyist
www.elmelectronics.com
2 of 76
ELM327DSH
Electrical Information
Pin Descriptions........................................................................... 3
Unused Pins.................................................................................5
Ordering Information.................................................................... 5
Absolute Maximum Ratings......................................................... 5
Electrical Characteristics..............................................................6
Using the ELM327
Overview...................................................................................... 7
Communicating with the ELM327................................................ 7
AT Commands............................................................................. 9
AT Command Summary...............................................................9
AT Command Descriptions........................................................ 11
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
Bus Initiation...............................................................................33
Wakeup Messages.....................................................................33
Selecting Protocols.................................................................... 34
OBD Message Formats..............................................................35
Setting the Headers................................................................... 37
Monitoring the Bus..................................................................... 40
CAN Messages and Filtering..................................................... 41
Multiline Responses................................................................... 42
CAN Message Formats..............................................................44
Restoring Order..........................................................................45
Advanced Features
Altering Flow Control Messages................................................ 46
Using CAN Extended Addresses............................................... 47
SAE J1939 Messages................................................................48
Using J1939............................................................................... 50
The FMS Standard.....................................................................53
Programmable Parameters........................................................ 54
Programmable Parameter Summary......................................... 55
Using Higher RS232 Baud Rates...............................................59
Setting Timeouts - AT ST and AT AT Commands..................... 61
Power Control............................................................................ 62
Design Examples
Microprocessor Interfaces..........................................................64
Example Applications.................................................................65
Modifications for Low Power Standby Operation....................... 70
Misc.
Error Messages and Alerts.........................................................72
Outline Diagrams....................................................................... 74
Copyright and Disclaimer........................................................... 74
Index.......................................................................................... 75
Contents


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