ELM327 v2.1


Changes to version 1.5


- ELM327 version 2.1 offers everything previous versions and some features:


  • A 512-byte RS232 transmission buffer.
  • Many improvements for speed and reliability.
  • An activity monitor, to put into energy saving mode and to be able to return.
  • Many of the new programmable parameters and AT commands.
  • Frequency matching to avoid false CAN sends during search.
  • The ability to process "Outstanding Answer" responses.

- Automatic detection of the following protocols:

  • ISO 9141-2 (5 baud init, 10.4 kbaud)
  • ISO 14230-4 KWP (5 baud init, 10.4 kbaud)
  • ISO 14230-4 KWP (fast init, 10.4 kbaud)
  • ISO 15765-4 CAN (11 bit ID, 500 kbaud)
  • ISO 15765-4 CAN (29 bit ID, 500 kbaud)
  • ISO 15765-4 CAN (11 bit ID, 250 kbaud)
  • ISO 15765-4 CAN (29 bit ID, 250 kbaud)

- Unfortunately this new version has eliminated 2 communication protocols and no longer works for PWM or VPW (SAE J1850).


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