Datamax A-Class A-4310, Programmer'S Manual

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Appendix G – Barcode Details
Class Series Programmer’s Manual 205
particularly when the volume of that data is small. It the data capacity is exceeded no symbol is
printed.
Size 101 to 104: Values 101 through 104 results in 1 through 4 layers (two modules thick)
respectively, around the center finder pattern. Data volume constraints apply as indicated in the table
above. Symbols will be of the compact form. All available code word will be used for error
correction. It the data capacity is exceeded no symbol is printed.
Size 201 to 232: Values 201 through 232 result in 1 through 32 layers (two modules thick)
respectively, around the center finder pattern. Data volume constraints apply as indicated in the table
above. Symbols will be of the full-size form. All available codewords will be used for error
correction. It the data capacity is exceeded no symbol is printed.
Size 300: Value 300 informs the printer that the data, which follows will be used to encode one
RUNE symbol. The data consists of one to three ASCII digits with value range of 0 to 256. The data
may include leading zeros. Data streams longer than three digits or data that includes non-numeric
characters may have unpredictable results.
Extended Channel Interpretation Mode: A value of 1 provides for extended channel codewords to
be inserted into the bar code symbol, using escape sequences in the datastream. This mode also
provides for effective Code 128 and UCC/EAN 128 emulations, when used in with appropriately
configured bar code readers. The valid values for escape sequences are of the form
<ESC>n
, where:
<ESC>
– 1 byte with value 27
10
= 1B
16
n
– 1 ASCII digit, range 0 through 6
These escape sequences are encoded as FLG(n) character pairs described in the International
Symbology Specification – Aztec Code, AIM, 1997-11-05, and the meanings of the values for n are
the same in both.
<ESC>0
– Is encoded as FLG(0), and interpreted as FNC1 or <
G
S
> depending on its location in
the data stream. The printer does not validate <ESC>0 locations in the data stream.
When <ESC>0 is the leading data in the stream, it is interpreted as a FNC1 as used in
the Code 128 symbology, and specifically for UCC/EAN 128 applications. For
appropriately configured scanners this will be interpreted/transmitted as a ]C1
symbology identifier preamble. The printer does not validate UCC/EAN 128 data
syntax.
When <ESC>0 follows a single alphabetic or two numeric characters respectively,
then it also interpreted as a FNC1. For appropriately configured scanners this would
be interpreted/transmitted as a ]C2 symbology identifier preamble, and the alpha or
numeric characters preceding the FNC1 are Application Indicators assigned by AIM
International. The printer does not check AI validity.
When <ESC>0 is anywhere else in the data stream, a <
G
S
> replaces it in the bar code
symbol, as with UCC/EAN 128 field separators.