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Serial Transmission has two subclasses synchronous and asynchronous. It consists of a D-shaped 9 pin cable that connects the data in series. However, the data transferred in the serial transmission is in proper order. 0 and 1 respectively.įor transmitting data to a longer distance, serial data cables are used. Eight bits are transferred at a time having a start and stop bit (usually known as a Parity bit), i.e. In Serial Transmission, data is sent bit by bit from one computer to another in bi-direction where each bit has its clock pulse rate.