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ICR890

Length Use the parameters of the Length group to configure testing of the code length.

Fig. 2-15: Data Matrix symbol size

2.1.6.2 PDF 417

PDF417 (PDF is the abbreviation for "Portable Data File") is a stacked type of barcode

The properties of this coding are:

! Automatic discrimination of line spacing

! Correction of errors

! Separation of channel and source coding via separate assignment tables

! Application-specific configuration of the code redundancy (security levels)

Fig. 2-16: PDF 417 example

Code PDF417 defines the three standard operating modes ASCII, binary mode and numer-

ical mode and contains nine further user-specific operating modes. In ASCII operating

mode, a code word codes two alphanumerical characters and in the numerical operating

mode 3 digits.

PDF417 is based on a (17,4,6) source coding with four bars and four spaces, divided to 17

modules. The maximum element width is six modules. Thus a PDF417 printout can contain

maximum 2000 8-bit characters.

Further coding technical properties of PDF417 include the possibility to detect and correct

errors. Therefore, a PDF417 reading symbol contains two check words to detect errors and

a variable number or correction words. Data backup can be configured at nine levels. Level

0 does not allow corrections (i.e. only error detection), Level 8 allows the complete recon-

struction of max. 510 destroyed code words for a reading symbol consisting of 925 code

words. However, this security level results in less information density due to the insertion of

check words.

General There are no further parameters for the General group.

Parameters Function

Code length mode Select the type of code length test.

Select up to five fixed square or rectangular code length ratios.

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