SECTION 8 " Programming
VT220/ANSI Terminal Emulation Programmer’s Reference Guide 8-3
C0 and GL Codes
The left half of the multinational character set consists of
control characters (C0 codes) and graphic characters (GL
codes). Control characters are 7-bit compatible, nondisplay-
able single-byte characters that perform specific functions
during communications and text processing. C0 codes
range from 00 to 1F hexadecimal, and include 7F hexadeci-
mal (DEL). They can be used in a 7-bit or an 8-bit environ-
ment.
Graphic characters are 7-bit compatible, displayable char-
acters that represent various alphanumeric characters,
punctuation marks, and symbols that appear in the wire-
less station’s display. GL codes range from 21 to 7E hexade-
cimal. They can be used in a 7-bit or an 8-bit environment.
The space character (20 hexadecimal) may be a graphic
character or a control character, depending on the context.
Table 8-1 shows the C0 and and GL codes recognized by the
wireless station. Ignored codes are parsed (removed) from
the data stream with no action taken by the wireless sta-
tion. Codes that the wireless station ignores are also indi-
cated in the table. Table 8-2 describes the action taken by
the wireless station when it receives a C0 code.
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