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Originally Posted by KenWittlief
with digital logic the higher voltage signal is always called 1 or H, and the low voltag signal is always 0 or L.
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Never say "always".
What you're describing is called
positive logic and is how most digital circuits work, including most of the Robot Controller. However,
negative logic exists as well. RS-232 serial communication uses negative logic, with a positive voltage being logic 0 and a negative voltage being a logic 1.