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(16) Explanation for the PDF417 and MicroPDF417
c Security level
The PDF417 contains a function to correct a code reading error using an error
correcting code word and restore normal data. The security level should be
designated according to usage to perform the error correction function.
For the MicroPDF417, the printer sets the security level automatically.
Security level Error Correction Ability
No. of error correction
code words
Level 0 0
Level 1 2
Level 2 6
Level 3 14
Level 4 30
Level 5 62
Level 6 126
Level 7 254
Level 8 510
d No. of columns (strings)
The number of rows are variable in the PDF417. The row length (No. of data strings)
is also variable. Therefore, a symbol can be created in a form that can be easily
printed, by changing the proportion of the height and width.
The number of columns (data strings) is varied between 1 and 30.
If the number of columns is too small when th data amount is large and the security
level is high, drawing may not be performed. This is because the number of rows
exceeds 90 when the number of columns becomes small. (When the PDF417 is
used, the number of rows of symbols is limited from 3 to 90.)
For the MicroPDF417, not only the number of columns (data strings) but also the
number of rows (data lines) can be designated. When these are to be designated,
see the table on page 100. Note that the max. number of digits for the set parameter
(gg) varies according to the character type. If data over the max. number of digits for
the set parameter (gg) is set, the bar code is not printed. The number of columns
(data strings) is varied from 1 to 4.
However, the max. number of lines, which is 44, depends on the number of columns.
(17) Explanation for QR code
c Error correction level
The QR code contains functions to detect and correct an error. If one of the data
characters is damaged, the information can be restored when this code is read.
There are 4 levels that can be designated. The level should be specified according
to usage. The general correction ability is as follows.
Level Error correction ability
Overhead by correcting
an error
High density level Low 7%
Standard level 15%
Reliability level 25%
High reliability level High 30%
Low
High