Datamax A-Class A-4310, Руководство программиста

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Appendix G – Barcode Details
Class Series Programmer’s Manual 219
Byte Compaction Mode (j = 1)
A value of 1 forces Byte Compaction. The compaction ratio is six 8-bit bytes of data compressed into
a 5-symbol codeword. See the table above for the maximum data allowed for any row/column/error
correction selection index (hi).
Macro Character Substitution Disable (k=1)
By default Macro Character Substitution is enabled (k=0). When enabled, Byte Compaction has
priority over Macro Character Substitution. When Macro Character Substitution is enabled, the data
stream header and trailer are compacted when they conform to the following forms:
[)>
R
S
05
G
S
data
R
S
E
o
T
or
[)>
R
S
06
G
S
data
R
S
E
o
T
where:
data
may not contain adjacent bytes with values
R
S
or
G
S
(
R
S
= 30
10
, 1E
16
and
G
S
= 29
10 ,
1D
16
and
E
o
T
= 4
10
,4
16
)
Functions Not Supported
•
General Purpose Extended Channel Interpretations, including Code-128 emulations
•
Structured Append
•
Reader Initialization Symbol Generation
•
Module shaving
W1Z: Micro PDF417 with Byte Count Specifier
Specified Length – The upper case Z identifies a Micro PDF417 bar code with a 4-digit string length
specifier. This allows values 0x00 through 0xFF to be included within the data strings without
conflicting with the DPL format record terminators. The four-digit decimal data
byte count
immediately follows the four-digit column position field. This value includes all of the data following
the byte count field, but does not include itself.
<STX>L
D11<CR>
1W1Z0000000150100001214000pdf<0x0D>417
121100000000100Barcode W1Z<CR>
E
Barcode W1Z
From the example, the bar code’s data stream,
1W1Z0000000150100 0012 14000PDF<0x0D>417
, includes a Byte Count Specifier (the
portion in bold), where 0012 equals the four-digit decimal data byte count and includes all bytes that
follow until the end of the bar code data. Field termination is set by the byte count.
<STX>
,
<CR>
,
and
<0x0D>
all represent single byte values of hexadecimal 02, 0D, and 0D, respectively. The Micro
PDF417 bar code produced encodes “pdf<CR>417”, and prints a line of text: Barcode W1Z.