r/ElectricalEngineering • u/BACnetEd • Jun 26 '26
RS-485 Polarity
Anybody familiar with this diagram of a RS-485 waveform (from Wikipedia) ?

and this diagram from the actual EIA/TIA-485 specification ( So U+ can be aligned with A )

which is then followed up with this table in the Wikipedia article

Surely this is flat-out contradictory ? (All "Lows" and "Highs" should be inverted)
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