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Module 5: External Communication Interface

20212m

Which lines are utilized during the enable state of hardware flow control in DTE and DCE devices of RS232?
(i) CD and IR
(ii) DSR and DTR
(iii) RTS and CTS
(iv) None of the above

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Answer: (iii) RTS and CTS

Explanation: In RS232 hardware flow control, RTS (Request To Send) and CTS (Clear To Send) are cross-coupled: DTE's RTS → DCE's CTS and vice-versa. When both enabled, data is transmitted only when RTS/CTS handshake is asserted (active low). DSR/DTR are modem readiness, CD is carrier detect.

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