BBX Sub pids

[cyipher]

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?

19269

[Move'n Up]

The Sub-pids will be added automatically when you add the primary/main PID

[cyipher]

just wondering as it didn't count sub pids towards the pid count at the bottom of the bbx screen

[Move'n Up]

You should be able to confirm by looking at the bottom left hand corner in the Selected PIDs screen afterwards.

[joecar]

The pids O2SxxV are "compound" pids.

I prefer logging HO2Sxx and SHRTFTx instead.

[cyipher]

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?

[joecar]

"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.

:)

[cyipher]

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

[joecar]

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".