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RS-422/485 SERIAL INTERFACE PLUS, 4-PORT
An extra bit used for error detection is often appended before the stop bits.
This special bit is called the parity bit. Parity is a simple method of
determining if a data bit has been lost or corrupted during transmission.
There are several methods for implementing a parity check to guard against
data corruption. Common methods are called (E)ven Parity and (O)dd
Parity. Sometimes parity is not used to detect errors on the data stream. This
is refereed to as (N)o parity. Because each bit in asynchronous
communications is sent consecutively, it is easy to generalize asynchronous
communications by stating that each character is wrapped (framed) by pre-
defined bits to mark the beginning and end of the serial transmission of the
character. The data rate and communication parameters for asynchronous
communications have to be the same at both the transmitting and receiving
ends. The communication parameters are baud rate, parity, number of data
bits per character, and stop bits (for example, 9600,N,8,1).