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Thread: PLX SM-AFR Serial upgrade

  1. #91
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    I did this to mine recently and its not working right.
    I have the generation 2.
    Does the positive for the board have to be 3.3V or 5?
    When I log it and turn the wideband on it reads correctly for a few seconds then freezes or drops to 10AFR.
    My gauge keeps reading correctly. When I test it with my DVM on the board it will read near 2.35 volts for a bit then drop to almost nothing.

  2. #92
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    i have a newer plx with only 1 PCB does anyone have pics of where to solder the wires onto it

  3. #93
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    Default PLX Serial Direct MALE DB9

    This thread is a bit old but I am happy to find all the information for the PLX Serial Mod.

    For any one who wants to connect a RS3232 TTL Male connector. This is what i found works.
    MAX RS3232 TTL MALE. It still uses 3.3-5 Volts so power supply can be taken just as in this thread.

    I connected it on to my M-300 PLX which is much easier to solder wires and connected directly to the wire that came with EFI Live.

    Very Simple. Hope to do some testing with it from tomorrow. I was using Innvoate LM-1 but it gave up on me after 9+ Years of service and i liked it more than the LM-2.

    So i had the PLX laying around and saw this thread and thought to try it out. Everything works just perfect !!! Thanks to all of you and the information provided.

    I took the test picture at night. Hope it helps.

    Click image for larger version. 

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  4. #94
    Joe (Moderator) joecar's Avatar
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    Thanks for sharing.

  5. #95
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    Is this still a necessary mod? Why cant we plug into the Serial TX port like on the LC-1?

  6. #96
    Joe (Moderator) joecar's Avatar
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    I think they now have a serial port... let me research this.

  7. #97
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    Thanks Joe. My LC-1 decided to quit, and I replaced it with the PLX. I'm afraid I should have done a little more research.

  8. #98
    Lifetime Member JezzaB's Avatar
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    Wow this thread is a flashback!
    Looking at the new SM-AFR and M-300 they still run the old TTL level serial chaining so would need a TTL to Serial converter still to push the output levels up to 12v RS232

  9. #99
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    I ordered one. Thanks for the confirmation.

  10. #100
    Lifetime Member Tre-Cool's Avatar
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    Quote Originally Posted by Jayrcr3 View Post
    I ordered one. Thanks for the confirmation.
    I honestly wouldn't go back to a plx device, there are much better/smaller units available on the market now that offer a direct serial comms wire..

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