ELM327 Programmable Parameters Version in which the Programmable Parameter first appeared… version PP 1.0 - none 1.0a - none 1.1 01 Printing of header bytes (AT H default setting) 02 Allow long messages (AT AL default setting) 03 NO DATA timeout time (AT ST default setting) 09 Character echo (AT E default setting) 0A Linefeed Character 0D Carriage Return Character 10 J1850 voltage settling time 11 J1850 Break Signal monitor enable 13 Auto search time delay between protocols 1 & 2 16 Default ISO baud rate (AT IB default setting) 17 ISO wakeup message rate (AT SW default setting) 18 Auto search time delay between protocols 4 & 5 24 CAN auto formatting (AT CAF default setting) 25 CAN auto flow control (AT CFC default setting) 26 CAN filler byte (used to pad out messages) 29 Printing of the CAN data length (DLC) default setting 00 Perform AT MA after powerup or reset 04 Default Adaptive Timing mode (AT AT setting) 06 OBD Source (Tester) Address 07 Last Protocol to try during automatic searches 0C RS232 baud rate divisor when pin 6 = 5 volts 2B Protocol A (SAE J1939) CAN baud rate divisor 2C Protocol B (USER1) CAN options 2D Protocol B (USER1) CAN baud rate divisor 2E Protocol C (USER2) CAN options 2F Protocol C (USER2) CAN baud rate divisor 1.2 1.2a - 1.3 2A Elm Electronics Inc., April 2014 Description no changes CAN Error Checking Page 1 of 2 ELM327 Programmable Parameters Version in which the Programmable Parameter first appeared… version PP Description 1.3a 2A b3, b4, b5 options added 1.4 0E Power Control Options 12 J1850 Volts (pin 3) output polarity 15 Minimum inter-message time for protocols 3 to 5 19 Time delay after protocol 5 when searching 2C b4 option added 2E b4 option added 1.4b 21 Default CAN Silent Monitoring Setting 2.0 0C modified to allow a wider range 0F Activity Monitor options 14 ISO/KWP final stop bit width (provides P4 interbyte time) 15 adjusted timing 19 changed default value 1A Protocol 5 fast initiation active time (TiniL) 1B Protocol 5 fast initiation passive time (TiniH) 1C ISO/KWP outputs used for initiation 1D ISO/KWP P3 time (delay before sending requests) 13 default value changed 18 default value and time multiplier change 19 default value changed 1E ISO/KWP delay before initiation starts 28 CAN Filter settings 2A b0, b1, b2 options added 2.1 Elm Electronics Inc., April 2014 Page 2 of 2