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Thread: PLX SM AFR Serial

  1. #1
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    Question PLX SM AFR Serial

    Hi All

    I have been using the PLX M300 with the mods as in the forum and it worked great for over two years. My device finally failed and i cant purchase the same anymore so i had to go with the newer SM AFR without a screen attached to it.

    I got a TTL RS232 adapter which I had for the previous PLX and did the same mods +3.3, GND and TX to the adapter VCC, GND and TX.

    Selected wideband com port and PLX and now the readings are 280-290 AFR. I checked with PLX and they say nothing is changed. Can someone help me with what can be wrong ?

    Click image for larger version. 

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    I have attached the ground pin from the main power adapter. I have checked the TTL adapter and the power supply is 3.3 Volts. But the readings are way too high. I was happy using the old unit and really got used to it. I can't go back to an analog configuration now since i really liked the clean serial data.

  2. #2
    Joe (Moderator) joecar's Avatar
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    What does V2 show in Lambda and EQR...?

  3. #3
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    It shows 19 - 20 Lamda. I didnt check EQR

  4. #4
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    Quote Originally Posted by joecar View Post
    What does V2 show in Lambda and EQR...?
    Could it be that its actually reading another fuel type like CNG ? I don't have a gauge. Is there any other way to check what it reads ? Also Joecar is there anyway to read it on to a PC with a terminal to view the serial output ?

    Thanks

  5. #5
    Joe (Moderator) joecar's Avatar
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    Looks like everything is off by a factor of 20...

  6. #6
    Joe (Moderator) joecar's Avatar
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    Yes, try connecting to HyperTerm or PuTTY on a Windows PC...

  7. #7
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    Do you know the settings to connect to them ? Like Baud rate, Data bits, Stop Bits etc ?

    Also after connecting how will it start logging ? Any commands to be send ?

  8. #8
    Joe (Moderator) joecar's Avatar
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    I think it's 9600/8N1

    I'm not sure if the PLX continually emits serial comm, or if it responds to commands...

    let's see if I can find out...

  9. #9
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    Quote Originally Posted by joecar View Post
    I think it's 9600/8N1

    I'm not sure if the PLX continually emits serial comm, or if it responds to commands...

    let's see if I can find out...
    This is what they send me.
    Attached Files Attached Files

  10. #10
    EFILive Developer Site Admin Blacky's Avatar
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    Quote Originally Posted by ne0c0de View Post
    It shows 19 - 20 Lamda. I didnt check EQR
    Are you using the latest software available here: https://forum.efilive.com/showthread...se-Candidate-3
    If not I highly recommend updating to it - it has a number of updates to the serial wide band data comms.

    Can you connect up the PLX to FlashScan, and select the FlashScan menu option: F1 Scan Tool -> F2 Data Logging -> F3 Display WO2.

    Use the Backspace key to cycle through the supported wide band controller types until you have selected PLX.
    Use the Enter key to cycle the display data until you can see Lambda and AFR, like this:
    Click image for larger version. 

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    Allow FlashScan to "see" the serial data for 5-10 seconds (the left orange LED should flash periodically to indicate that serial data is being sent/recv).
    Then (without powering down FlashScan) select the option: F1 Scan Tool -> F3 Scan Options -> F4 Save COM Data
    Then using EFILive Explorer, copy the saved file from FlashScan to your PC and send it to me at paul@efilive.com (or attach it to this thread).

    Regards
    Paul
    Before asking for help, please read this.

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