- 2075 Asoj · 2+4 marks
RS-232C importance; time to transmit a string at 4800 baud
Short answer
RS-232C standardizes voltage levels (±3–15 V), DB-9/DB-25 connectors, and handshaking for DTE–DCE links. The string "Life is beautiful." has 18 characters; each 10‑bit frame (1 start + 7 data + 1 parity + 1 stop) gives 180 bits. At 4800 baud, time = 180/4800 = 37.5 ms.
What is the importance of RS232-C in serial communication? Determine the time required to transmit a string: "Life is beautiful." using asynchronous serial data transfer method in baud rate of 4800 Baud. Suppose a character has 7 bits data, one bit start bit, one bit stop bit and one bit even parity bit.
Importance of RS-232C
RS-232C is the standard serial interface between a DTE (computer) and a DCE (modem) or other serial equipment. It defines electrical levels (mark -3 to -15 V, space +3 to +15 V), connector (DB-25/DB-9), signal functions (TXD, RXD, RTS, CTS, DSR, DTR) and handshaking. It gives a simple, cheap, universal way to connect PCs, modems, printers and microcontroller boards using only a few wires.
Time to transmit "Life is beautiful."
Characters: "Life" (4) + space (1) + "is" (2) + space (1) + "beautiful" (9) + "." (1) = 18 characters. Frame = 1 start + 7 data + 1 even parity + 1 stop = 10 bits.
Total bits = 18 x 10 = 180 bits
Time = 180 / 4800 = 0.0375 s
Answer: 37.5 ms (character time 2.083 ms, 480 characters/s).
✓ Answer checked by Claude Sonnet 5.5
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