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Thread: ELM327 - Accessing Higher Speeds

  1. #1
    Constant Bitrate
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    ELM327 - Accessing Higher Speeds

    I have a friend who has purchased one of the ELM327 1.2a USB devices off eBay. There's a million people selling them now.

    I have dealt with this type of ELM before, and know that the chip itself requires logic on a pin to switch between low speed (9600) and high speed (default 38400, but software configurable).

    However, we're struggling to find out how to trigger the high speed mode on these 'cheap' tools.

    Has anyone had any success?

    An image of a similar box is attached.


    Lukeyson
    Attached Images Attached Images  

  2. #2
    VENDOR - OBDPros
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    On this one you cannot easily do this, it seems the chinese figured out a way to break the code protection and duplicate the ELM 321 v1.0a micro, but then they cheat by calling the board a 1.2 and selling it that way but unfortunately the firmware is still 1.0a so you cannot switch speeds via software.

    You can still switch this one to 38400 but physicall soldering a wire to one of the pins I am not sure which one you would need to look in the datasheet.

    The obdpro interface www.obdpros.com was the first one to support configurable speeds the ELM does support them now but maxes out at 500KBits whereas the OBDPros goes all the way upto 1.25Mbits

    Paul
    www.obdpros.com

  3. #3
    Newbie
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    I have that and classify as an introduction, ELM 327 multi protocol so its not the hard ware but the software and interface configs

  4. #4
    Newbie
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    not so good on the pre 2001 cars but useful because it explains a lot as how the dealer ship manipulates the 16 pin connector and used it as a multi protocol interface and didn't use it as standard, its 16 pin and many use it to connect to certain ecus and many protocols are used like rewiring the 16 pin DLC so it can connect to other systems or just using it to divert information.
    can bus has a definite protocol and the others abuse by like dealers

  5. #5
    Vendor - Qube colin's Avatar
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    Would I be crazy to say that I have the exact same module and it only works at 38400?

    I use ScanTool.net and it absolutely will not connect at 9600, only at 38400...

  6. #6
    VENDOR - OBDPros
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    Quote Originally Posted by colin View Post
    Would I be crazy to say that I have the exact same module and it only works at 38400?

    I use ScanTool.net and it absolutely will not connect at 9600, only at 38400...
    When did you purchase yours? Maybe on the newer ones they have started setting the speed to 38400 via the hardware pin....

  7. #7
    Constant Bitrate
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    Quote Originally Posted by michbound View Post
    .... it seems the chinese figured out a way to break the code protection and duplicate the ELM 321 v1.0a micro, but then they cheat by calling the board a 1.2 and selling it that way but unfortunately the firmware is still 1.0a so you cannot switch speeds via software.
    www.obdpros.com
    Hmm. So no J1939 support or ISO timing adjust either eh? I've been well and truly sucked in by the 1.2a lie.

    To be honest, I was looking for another tool that could sniff at 500kbps while my Mongoose was doing it's bidness. Given that the obdpro website says the tool can only do 128000bps - even the USB one - I've been keeping away. Bad marketting perhaps?

    I don't suppose there's any chance the OBDPro will listen or send to mutliple protocols at the same time is there?


    Lukeyson

  8. #8
    Constant Bitrate joeyoravec's Avatar
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    Quote Originally Posted by Lukeyson View Post
    To be honest, I was looking for another tool that could sniff at 500kbps while my Mongoose was doing it's bidness.
    drumroll please..... try a second Mongoose?

  9. #9
    VENDOR - OBDPros
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    Quote Originally Posted by Lukeyson View Post
    Given that the obdpro website says the tool can only do 128000bps - even the USB one - I've been keeping away. Bad marketting perhaps?

    I don't suppose there's any chance the OBDPro will listen or send to mutliple protocols at the same time is there?


    Lukeyson

    Nope does not send multiple protocols simultaneously, I need to update the speeds on the website, thought I already had done that thanks for pointing that out.

    What protocols are you looking at simultaneously?

    Thanks
    Paul

  10. #10
    Vendor - Qube colin's Avatar
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    Quote Originally Posted by michbound View Post
    When did you purchase yours? Maybe on the newer ones they have started setting the speed to 38400 via the hardware pin....
    I bought mine within the last 3-4 months.

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