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• 07:15, 4 October 2026 BACnetEd talk contribs created page RS-485 Polarity First Principles (Created page with "'''Attempting to reduce RS-485 polarity issues to fundamental reasoning * A>B means "binary 0 on the bus" or "ON" - from the standard * "MARK" state (no transmitters enabled) is defined by line biasing, and sets A>B, and this is "Idle" * UARTs output a logic '1' (high voltage) for Idle state! * A is non-inverting (+), B is inverting (-) Done")