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An RS-485 network is usually half duplex, which means the software must

  • A.poll each node in a fixed sequence
  • B.use a separate pair for each direction
  • C.turn the transmitter off promptly after sending
  • D.send every one of its characters twice over, for reliability

Answer: C

Leaving the driver enabled blocks every other node from replying, so the turnaround has to happen as soon as the last bit has left the shift register rather than when the software queued it. Getting that timing wrong is the classic RS-485 bring-up fault.

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