A one-bit signal that indicates the start of data transmission by an asynchronous device is

A. Parity bit
B. Status bit
C. Zero bit
D. Start bit

Check Answer

The correct answer is D) Start bit.
In asynchronous communication, data is transmitted in a series of bits, with each byte of data being framed by a start bit and a stop bit. The start bit is always a value of 0 and indicates the beginning of a new byte of data. The stop bit is always a value of 1 and indicates the end of a byte of data.
Option A (Parity bit) is an additional bit that may be added to a byte of data to detect errors in transmission. It is not used to indicate the start of data transmission.
Option B (Status bit) is a bit used to indicate the status of a device or system, and is not related to data transmission.
Option C (Zero bit) is not used as a start bit in asynchronous communication.
Therefore, the correct answer is D) Start bit.
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