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APPENDIX C: Asynchronous Communications

Figure C-1. Asynchronous communications bit diagram.

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 or (O)dd Parity. Sometimes parity is not

used to detect errors on the data stream. This is referred

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

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