How to make your PLX SM-AFR wideband unit work with Evoscan!

Discussion in 'ECUs and Tuning' started by lathiat, Feb 16, 2012.

  1. lathiat

    lathiat Leaving Skid Marks

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    I have completed the first Beta of my program which converts the PLX iMFD protocol, to the AEM UEGO protocol, it is very rough but it works and allows you to log the PLX wideband with Evoscan.

    Download: http://lathiat.net/files/PLXAEMConvertor.exe

    You need to use VSPE to create some virtual serial ports, you can find it here:
    http://www.eterlogic.com/Products.VSPE.html

    Setup a basic com port "pair" in VSPE, then start the application (.NET 4.0 required) -- select the com port with your PLX wideband attached and then one half of the virtual com port pair you created in VSPE.

    Then in evoscan set the wideband to "AEM", then select the other half of the virtual com port pair as the port. Then don't forget to enable the WDB item.

    To connect the PLX SM-AFR to your computer, you can use the iMFD USB cable here:
    http://www.plxdevices.com/datalogger.html

    Or you can do what I did.. solder a couple of RCA jacks to some jumper wires, and poke those pins onto a FTDI board like this:
    http://www.sparkfun.com/products/9873
    Then use a standard 2xRCA => 3.5mm stereo headphone socket cable to connect them. Only RX is required for this program.


    I tested it tonight and it worked great, however, I have not yet tested to see how much of a delay it introduces. I don't believe it is any/much but I haven't checked.

    Here's a screenshot, forgot to take one while I was in the car / it was reading the values:
    PLXAEMConvertor.png

    I will polish this up into a better application but I thought I'd release this early version so some folks can at least test it / use it if they so desire.


    An obvious alternative is to use the analogue output via the ECU, however, I wanted to use that output to log Boost and right now we only know of 1 usable output (Legnum VR-4 7202 ECU).
     
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  2. kc427

    kc427 Hesitantly Boosting Lifetime Member

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    Great!! Is it the latest software from the link above?
     
  3. pretzil

    pretzil 2 AYC Bars Premium Member

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    very old post above, more than 5 years, he's still using windows XP in that screenshot... I'll see if I can dig up what I figured out with my MTX-L tonight and you can try it out.
     
  4. pretzil

    pretzil 2 AYC Bars Premium Member

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    Sorry no I never did it like this, ended up just connecting the analog signal wire on mine directly to the ecu and reading it that way.
     
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  5. kc427

    kc427 Hesitantly Boosting Lifetime Member

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    I was thinking similar thing before. PLX has published their protocol of the data, and I guess Innovate Motorsport also, so maybe we can do something to convert PLX data to Innovate Motorsport data
     
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