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ELM327 - Accessing Higher Speeds

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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 Files

  • #2
    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

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

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      • #4
        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

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        • #5
          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...
          2001 Mustang Convertible Worklog
          Indigo Custom Frontend (Flash/Delphi)
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          • #6
            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....

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            • #7
              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

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              • #8
                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?

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                • #9
                  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

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                  • #10
                    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.
                    2001 Mustang Convertible Worklog
                    Indigo Custom Frontend (Flash/Delphi)
                    Blog

                    Qube v1.3 Now Available at the mp3Car Store!!!!!!
                    The simplest IO controller you'll ever use!

                    Comment


                    • #11
                      Originally posted by joeyoravec View Post
                      drumroll please..... try a second Mongoose?
                      Wow - didn't that come from left field.....

                      To be honest Joey, while the Mongeese do a good job of bringing the Drewtech products down closer to the home-tinkerer level of pricing, I've already been caught out with it only supporting 2 x Protocols and no pin voltage.

                      If I bought another J2534 device for playing at home it would have to be a true multiprotocol voltage-applying tool. I understand that the cardaq is this - but the Cardaq isn't exactly priced to target me as a consumer - by a factor of around 3.

                      However, this shouldn't detract from how excellent the Mongoose has been when being used in the way in which it was intended to from purchase. If only the blinken thing would work in Vista64! It has, however, been faultless in XP, even with a USB extender.


                      Lukeyson

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                      • #12
                        Originally posted by michbound View Post
                        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
                        Er, so does that mean it can listen to multiple protocols at once? I'm guessing no as well.

                        The main protocols for me are CAN and ISO. I do a lot of manual switching back and forth on my old slow serial ELM. I have a CAN/ISO Mongoose as well - that may not have been made obvious in this thread.

                        Is there any chance a J2534 'shim' may be on it's way for the OBDPro? It would obviously have to do a lot of fudging. I know you've touched on it as a future possibility in the past. No harm in asking again.


                        Luke

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                        • #13
                          inoVI I tried to post this with links bu got booted gold style

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                          • #14
                            they are a well known company in diagnostics and have an interface 16 pin to 23 pin or more which allows duplex which elm327 seems to fail because its 16 pin to 9 pin db, 16 to 23 allows more input and extraction, I tried to buy one in the UK with no success ( Peugeot Citroen use this process, Peugeot/Citroen/Renault use this on a 30/VARIABLE pin connection on E.L.I.T as long as its upgraded to 2000+

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                            • #15
                              any one wana buy some e.l.i.t pods hmmm worthless of course

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