Asynchronous Data Transmission:
In this method,data is transmitted character by character
There are irregular gaps between characters in this
transmission.
It uses a special start signal that is transmitted at the
beginning of each message.
The start signal is sent when the character is about to be
transmitted.
A start bit has a value of zero and is called a space start.
The value of zero means that a character is about to be
transferred.
It alerts the receiver and it gets ready to receive the character.
If start bit has a value 1,it indicates that the line is
idle.
It is also called a mark state.
Synchronous Transmission:
In this method ,the data is transferred block by block.
Each block may consist of many characters.
A large amount of information canbe transmitted with this
type of transmission.
Synchronous transmission is much faster than asynchronous transmission
because there is no gap
between the characters.
This transmission is suitable for remote communication
between a computer and related devices like a printer.
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