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Thread: BBX Sub pids

  1. #1
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    Default BBX Sub pids

    Looking at monitoring my STFT and looking at the bbx screen, it lists sub pids when i select the main O2 pid. Are the sub pids automatically added or is it just saying it needs those pids added manually as well to work?

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  2. #2
    Lifetime Member Move'n Up's Avatar
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    The Sub-pids will be added automatically when you add the primary/main PID
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  3. #3
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    just wondering as it didn't count sub pids towards the pid count at the bottom of the bbx screen

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    Lifetime Member Move'n Up's Avatar
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    You should be able to confirm by looking at the bottom left hand corner in the Selected PIDs screen afterwards.
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  5. #5
    Joe (Moderator) joecar's Avatar
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    The pids O2SxxV are "compound" pids.

    I prefer logging HO2Sxx and SHRTFTx instead.

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    What is a compound pid? and why is it not preferred? also for the ls1b it lists a maximum of 24 pids, is this a recommended max for logging speed? or something else?
    Last edited by cyipher; February 18th, 2016 at 04:34 AM.

  7. #7
    Joe (Moderator) joecar's Avatar
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    "compund" pid (sorry, I couldn't think of a better term) is the pid with multiple field content, e.g. the pid O2S11V contains both O2 voltage and SHRTFT.


    You can log it and use it... it occupies 2 pid channels (the separate pids HO2S11 and SHRTFT1 each occupy 1 pid channel, so it's the same).


    I prefer (it's my preference) to have the pids separate because there are logs where I want something else instead of SHRTFT.


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    What about the 24 pid limit? is it a hard limit or a recommended limit for logging speed?

  9. #9
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by cyipher View Post
    What about the 24 pid limit? is it a hard limit or a recommended limit for logging speed?
    The 24 pid channel count is not a limit, but a recommendation to achieve the fastest logging frame rate...

    ( most pids occupy 1 pid channel, some occupy 2, and some 4 )

    in Stream-Fast mode logging from an LS1B PCM:
    1 to 24 pid channels logs at 10 frames/s
    25 to 48 pid channels logs at 5 frames/s
    ( a frame containing all the pids selected for logging )

    see scantool user manual pdf Appendix E "Scan Modes".

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