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ASCII stands for American
Standard Code for Information Interchange. It ranges from 0
to 255 in Decimal or 00 to FF in Hexadecimal. ASCII codes can be
divided into two sets - Standard ASCII codes and Extended ASCII
codes.
Standard ASCII codes range from 0 to 127 in Decimal or 00 to 7F in
Hexadecimal, they are mainly used for representing characters,
such as characters "a" to "z" and number "0" to "9", these are
called printable characters, note that code 0 to 31 (Decimal) in
Standard ASCII are not printable, they are assigned for control
characters that are used to control some peripheral devices such
as printers, for example, 12 represents the Form Feed / New Page
function. This command instructs a printer to skip to the top of
the next page. The Standard ASCII chart below illustrates the
details of the codes.
Extended ASCII codes range from
128 to 255 in Decimal or 80 to FF in Hexadecimal. They meet the
demand for more characters and symbols that are used for many
languages. Together with the control codes (0 to 31) in Standard
ASCII table, Extended ASCII codes are also widely used in
communication protocol, such as RS-232, RS-485, RS-422 and TTL
systems. The Extended ASCII chart below illustrates the details
of the codes.
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