13 13 votes Purpose of a start bit in $\text{RS-232}$ serial communication protocol is: to synchronize receiver for receiving every byte to synchronize receiver for receiving a sequence of bytes a parity bit to synchronize receiver for receiving the last byte Computer Networks gate1997 computer-networks serial-communication normal out-of-gatecse-syllabus + – Kathleen 5.9k views answer comment Share Follow Print See all 2 Comments 2 2 Comments reply Gurdeep Saini commented Oct 11, 2018 reply Follow flag you might get a doubt whether the communication is synchronous serial communication or asynchronous serial communication answer is asynchronous serial communication because they mention that start bit is RS-232 but in case of synchronous serial communication there is no start bit and end bit 6 6 replyShare P0535_Yedidyah_Sagar commented Oct 12, 2025 reply Follow flag Out of cse syllabus 1 1 replyShare Please log in or register to add a comment.
15 15 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 : GATE2002-1.11 Anu007 answered Jan 7, 2018 Anu007 comment Share Follow See all 3 Comments 3 3 Comments reply Mk Utkarsh commented Jan 7, 2018 reply Follow flag which part of kurose and ross covers this communication portion? btw your answer is better than others :) 0 0 replyShare dragonball commented Jan 20, 2018 reply Follow flag Plz give the complete link . 0 0 replyShare meghna commented Sep 9, 2018 reply Follow flag @Anu007 is asynchronous always by default?? 0 0 replyShare Please log in or register to add a comment.
10 10 votes A) Because $\text{RS-232}$ requires a start before each byte transmission for synchronization. Hunaif answered Oct 7, 2014 • edited Jan 5, 2018 by pavan singh Hunaif comment Share Follow See 1 comment 1 1 comment reply biranchi commented Apr 27, 2016 reply Follow flag Why not B) ? 3 3 replyShare Please log in or register to add a comment.
1 1 vote option A ... http://www.best-microcontroller-projects.com/how-rs232-works.html Puja Mishra answered Jan 31, 2017 Puja Mishra comment Share Follow See 1 comment 1 1 comment reply Anu007 commented Jan 7, 2018 reply Follow flag Check my answer 0 0 replyShare Please log in or register to add a comment.
