Intermec VT220/ANSI, Programmer'S Reference Manual

Page: 143 / 276

SECTION 8
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Programming
VT220/ANSI Terminal Emulation Programmer’s Reference Guide 8-7
C1 and GR Codes
The right half of the DEC multinational character set con-
sists of eight-bit control codes (C1 codes) and supplemental
graphic characters (GR codes). C1 codes are nondisplayable
codes that perform additional functions beyond those pos-
sible with the C0 codes. C1 codes range from 80 to 9F hexa-
decimal.
The supplemental graphic characters set (GR codes) range
from A0 hexadecimal to FF hexadecimal. The set has
alphabetic characters with accents and diacritical marks
that appear in the major Western European alphabets. It
also has other symbols not included in the ASCII graphics
set.
Table 8-3 shows the C1 control characters and GR codes
recognized by the wireless station. Ignored codes are
parsed (removed) from the data stream with no action tak-
en by the wireless station. Codes that the wireless station
ignores are also indicated in the table. Note that some let-
ters that are normally in uppercase are converted into low-
ercase. The hexadecimal values for the converted letters
are:
C0, C1, C2, C8, CA, CB, CC, CD, CE, CF, D9, DA, and DB.
(These values may be supported correctly in later versions.)
Table 8-4 describes the action taken by the wireless station
when it receives a C1 control code.