Behavior
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Valid characters: The entire 128 ASCII character set.
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Variable length
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Valid bar widths: The fourth character of record is the width of the narrow bar in
dots.
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All other bars are a ratio of the narrow bar (2 times the narrow bar width, 3 times the
narrow bar width, and 4 times the narrow bar width).
This printer supports the Code 128 subsets A, B, and C. If the data begins with at least
four numeric characters the default start code is subset C. If there is a non-numeric in
the first four characters or there are less than four then the default start code is
subset B. Subset switching between B and C is based on the following rules:
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If in subset C and there are an odd number of numeric digits, subset B will be set
prior to the last digit.
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If four or more numeric digits appear consecutively while in subset B, the character
code C will be set prior to the digits. If there is an odd number of numerics already
in B, the first numeric will be placed in B with the others in C.
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When in subset C and a non-numeric occurs, subset B will be inserted prior to the
character.
Note: There is no auto switching from, or to, subset A. Standard switches are still used. See
table below.
Subset A: Includes all of the standard uppercase alphanumeric keyboard characters
plus the control and special characters.
Subset B: Includes all of the standard uppercase alphanumeric keyboard characters
plus the lowercase alphabetic and special characters.
Subset C: Includes the set of 100 digit pairs from 00 through 99 inclusive, as well as
special characters. Code128 Subset C is used for double density encoding of numeric
data.
Special Character Handling: Characters with an ASCII value greater than 95 are
considered special characters. To access these values, a two-character reference table
is built into the printer; see table below. As an example, to encode FNC2 into a
Code128 Subset A barcode, send the ASCII & (DEC 38, HEX 26) followed by an ASCII
B (DEC 66, HEX 41). Code FNC2 will be encoded.
ASCII 2 CHAR CODE A CODE B CODE C
96 &A FNC3 FNC3 N/A
97 &B FNC2 FNC2 N/A
98 &C SHIFT SHIFT N/A
DPL Command Reference
229
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