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(16) Explanation for the PDF417, MicroPDF417
Security level
The PDF417 contains a function to correct a code reading error using an error
correcting code word and restore normal data.
according to usage to perform the error correction function.
For the MicroPDF417, the printer sets the security level automatically.
Security level
Level 0
Level 1
Level 2
Level 3
Level 4
Level 5
Level 6
Level 7
Level 8
No. of columns (strings)
The number of lines is variable in the PDF417. The line 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 variable between 1 to 30.
If the number of columns is small when data amount is large and security level is also
high, drawing may not be performed. This is because the number of lines exceeds 90
when the number of columns becomes small. (When the PFD417 is used, the number
of lines 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 66. 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 variable from 1 to 4.
However, the max. number of lines, which is 44, depends on the number of columns.
(17) Explanation for QR code
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 general correction ability is as follows.
Level
High density level
Standard level
Reliability level
High reliability level
Error Correction Ability
Low
High
Error correction ability
Low
High
- 90 -
The security level is designated
No. of error correction
code words
0
2
6
14
30
62
126
254
510
Overhead by correcting
an error
7%
15%
25%
30%
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