Discussion
Which of the following signal controls the flow of data ?
Answer: C
The key's answer is RTS and DTR.
In RS-232 serial communication, hardware handshaking signals control when data may be sent. RTS (Request To Send), answered by CTS, tells the other device that a terminal wants to transmit, and DTR (Data Terminal Ready), answered by DSR, tells it that the terminal is ready. Together these control signals manage the flow of data between the DTE and the DCE, so the combined option is the complete answer.
Naming RTS or DTR alone gives only one of the two handshake lines. ECNR is not an RS-232 signal.
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