Thank you Paul for your full explanations,

I will try to go deeper on tests when I have time, if I find anything 
helpful I will report here.

However tell me:
the Maxim PIO status register give 2 bits per PIO   :
PIO pin state and Latch state (at least for the DS2413)
owfs give 3 informations per PIO:  PIO  latch and sensed
So one is built by owfs software, no?

Also if I write to only one PIO (echo 1 > PIO.B) does owfs use a mask to 
build the PIO byte, from where come the other bits of the mask (sensed, 
latch, pio)?

Thanks in advance

--
Guy


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