Both sides of the serial communication must be configured for parity. Then every 8th bit is defined as the parity bit.

19) Add an 8th bit for the following binary numbers to act once as an even parity and another time as an odd parity.

i 1010001 ii 1111000

The inclusion of a parity bit extends the message length. There are more bits that

can be in error since the parity bit is now included. The parity bit may be in error

when there are no errors in the corresponding data bits. Therefore, the inclusion of

a parity bit with each character would change the probability of receiving a correct

message.

A parity bit, or check bit, is a bit that is added to ensure that the number of bits with the value one in a set of bits is even or odd. Parity bits are used as the simplest form of error detecting code.