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That is true, I missed this in the spec. I did not try to add it while at at “break level”.
I’m guessing most (if not all) SDI-12 sensors wake up on a rising edge then start their timers from there. I think it will work all the same while respecting the SDI-12 spec.
I’ve actually got a few sensors now. As soon as I’ve got the hardware to drive them, I’ll try changing the “waiting level” to a break, see if that changes anything.