(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 | |||||
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Level 0 |
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| 0 | |
| Low |
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Level 1 |
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| 2 | ||
Level 2 |
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| 6 | |
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Level 3 |
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| 14 | |
Level 4 |
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| 30 | |
Level 5 |
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| 62 | |
Level 6 |
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| 126 | |
Level 7 |
| High |
| 254 | |
Level 8 |
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| 510 | |
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dNo. 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 per one line) is variable between 1 and 30.
If the number of columns is small when data amount is large and security level is high, drawing may not be performed. This is because the number of lines exceeds 90 when the number of columns becomes small. (When the PDF417 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 90. 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 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 | |||
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High density level | Low | 7% | |
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Standard level |
| 15% | |
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Reliability level |
| 25% | |
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High reliability level | High | 30% | |
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