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PDL principles and procedures
Using LCDS Print Description Language 1-9
Table 1-2. Types of string constants
Constant Definition Example
Hexadecimal Normally used as string constants,
but they may also be used as
value constants. Each pair of
hexadecimal characters results in
one byte. A hexadecimal constant
must immediately be preceded by
the characters X apostrophe (X’),
then followed by another
apostrophe, to indicate to the PDL
compiler that the expression that
follows is in hexadecimal.
IDEN PREFIX=X'C1C2C3C4';
ASCII Used as string constants. Each
character results in one byte. The
constants must be preceded by
the characters A apostrophe (A’)
and followed by an apostrophe
character.
IDEN PREFIX=A'ABC!44EF'
is equivalent to
IDEN PREFIX=X'414243444546'
The ASCII string type allows
hexadecimal representation of
characters to be embedded in a
string. This is done by preceding
the hexadecimal representation of
the character with an ! character.
The three character sequence
required for the hexadecimal
representation of a character
results in one byte.
Two successive ! characters (!!)
are necessary to represent one
actual ! character when printing.
The two character sequence (!!)
results in one byte.