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ELM327SM Datasheet(PDF) 2 Page - ELM Electronics |
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ELM327SM Datasheet(HTML) 2 Page - ELM Electronics |
2 / 76 page 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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