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RS-485 Full Duplex Over Two Wires Reference Design (TIDA-00862)

The design enables full duplex RS-485 communications over a single pair of conductors rather than four by utilizing bus contention. By adding small-valued serial resistors to the bus lines to limit currents, a tri-stated differential bus is allowed and the SN65HVD96 SymPol transciver can be used to detect a state of bus contention. Simple digital logic and analog filtering techniques enable both transceivers to drive and receive from eachother simultaneously without the need for 2 additional bus wires.


Full duplex differential signaling Up to 1Mbps data rate Requires only two bus wires Physical level implementation


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RS-485 Full Duplex Over Two Wires Reference Design TIDA-00862

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