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Which among the following signal is not standard RS-232-C signal?

  • A.VDR
  • B.RTS
  • C.CTS
  • D.DSR

Answer: A

Correct answer: VDR

RTS, CTS and DSR are all RS-232-C control signals - request to send, clear to send and data set ready. VDR is not among the standard's signals.

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