Design
Full duplex over two wires reference design
This design from Texas Instruments enables full duplex RS-485 communications over a single pair of conductors rather than four by utilising 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 analogue filtering techniques enable both transceivers to drive and receive from each other simultaneously without the need for two additional bus wires.
Features
- Full duplex differential signalling.
- Up to 1Mbps data rate.
- Requires only two bus wires.
- Physical level implementation.
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