Multiple choice

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

  1. RTS

  2. CTS

  3. DSR

  4. VDR
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

RS-232C is a standard for serial communication. RTS (Request to Send) and CTS (Clear to Send) are used for hardware flow control. DSR (Data Set Ready) indicates the modem is ready. VDR is not a standard RS-232C signal - the correct signals are TD (Transmit Data), RD (Receive Data), RTS, CTS, DSR, DTR (Data Terminal Ready), DCD, and RI.

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