Datamax E4203 manual Error Correction

Appendix G

Error Correction

Size 001 to 099: This value specifies the percent of symbol code words to be used for error correction. Actual error correction word percentage will vary depending on data. The default value, approximately 23%, is recommended. Any other value may be selected to meet the user’s needs. Some minimum-security codewords may be generated depending on the data sent for encoding, 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 result 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 codewords 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 barcode 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 barcode readers. The valid values for escape sequences are of the form <ESC>n, where:

<ESC>	–	1 byte with value 27 10 = 1B16
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 < GS> depending on its location in the datastream. The printer does not validate <ESC>0 locations in the datastream.

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 datastream, a <GS> replaces it in the barcode symbol, as with UCC/EAN 128 field separators.

124 E-Class DPL Programmer’s Manual