Determine the synchronization of bits
The synchronization provided by use of start and stop bits, an extra bit known as a parity bit may optionally be transmitted along with the data. Diagram demonstrates the inclusion of an additional parity bit for error control purposes. A parity bit affords a small amount of error checking, to help detect data corruption which might take place during transmission. You can choose odd parity, even parity, space parity, mark parity or none at all. When odd or even parity is being used, numbers of marks (logical 1 bit) in every data byte are counted and a single bit is transmitted following the data bits to specify whether the number of 1 bit just sent is even or odd.