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ELM327 Datasheet(PDF) 9 Page - ELM Electronics |
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ELM327 Datasheet(HTML) 9 Page - ELM Electronics |
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9 / 82 page  Several parameters within the ELM327 can be adjusted in order to modify its behaviour. These do not normally have to be changed before attempting to talk to the vehicle, but occasionally the user may wish to customize these settings – for example by turning the character echo off, adjusting a timeout value, or changing the header bytes. In order to do this, internal ‘AT’ commands must be used. Those familiar with PC modems will immediately recognize AT commands as a standard way in which modems are internally configured. The ELM327 uses essentially the same method, always watching the data sent by the PC, looking for messages that begin with the character ‘A’ followed by the character ‘T’. If found, the next characters will be interpreted as an internal configuration or ‘AT’ command, and will be executed upon receipt of a terminating carriage return character. If the command is just a setting change, the ELM327 will reply with the characters ‘OK’, to say that it was successfully completed. Some of the following commands allow passing numbers as arguments in order to set the internal values. These will always be hexadecimal numbers which must generally be provided in pairs. The hexadecimal conversion chart in the OBD Commands section (page 29) may be helpful if you wish to interpret the values. Also, one should be aware that for the on/off types of commands, the second character is the number 1 or the number 0, the universal terms for on and off. The remainder of this page, and the two pages following provide a summary of all of the commands that the current version of the ELM327 recognizes. A more complete description of each command begins on page 11. Note that the settings which are shown with an asterisk (*) are the default values. 9 of 82 ELM327 ELM327DSI Elm Electronics – Circuits for the Hobbyist www.elmelectronics.com AT Command Summary AT Commands General Commands <CR> repeat the last command BRD hh try Baud Rate Divisor hh BRT hh set Baud Rate Timeout D set all to Defaults E0, E1 Echo off, or on* FE Forget Events I print the version ID L0, L1 Linefeeds off, or on LP go to Low Power mode M0, M1 Memory off, or on RD Read the stored Data SD hh Save Data byte hh WS Warm Start (quick software reset) Z reset all @1 display the device description @2 display the device identifier @3 cccccccccccc store the @2 identifier Programmable Parameter Commands PP xx OFF disable Prog Parameter xx PP FF OFF all Prog Parameters disabled PP xx ON enable Prog Parameter xx PP FF ON all Prog Parameters enabled PP xx SV yy for PP xx, Set the Value to yy PPS print a PP Summary Voltage Reading Commands CV dddd Calibrate the Voltage to dd.dd volts CV 0000 restore CV value to factory setting RV Read the input Voltage Other IGN read the IgnMon input level |
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