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GATE CSE 1997 | Question: 2.3

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11 votes
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Purpose of a start bit in $\text{RS-232}$ serial communication protocol is:

  1. to synchronize receiver for receiving every byte
  2. to synchronize receiver for receiving a sequence of bytes
  3. a parity bit
  4. to synchronize receiver for receiving the last byte
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3 Answers

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14 votes

 The start bit is used to signal the beginning of a byte and the stop bit is used to signal the end of a Byte. 

If question ask in synchronous serial communication then we need to append start bit for Frame , but since here it is not given so we need to assume asynchronous serial . Hence A is answer

Reffer : 

  1.  GATE2002-1.11
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A) Because $\text{RS-232}$ requires a start before each byte transmission for synchronization.

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