When PDF417 or MicroPDF417 is used, the number of symbol characters called code words is limited to 928 or less. Moreover, the data compression rate varies according to the contents of data. Therefore, the maximum number of digits according to modes is as below.
When letters and numerics are mixed in data in EXC mode, for example, the maximum values become smaller than the values below, since the internal mode switching code is used.
To correct a reading error by designating the security level, the maximum value becomes smaller, since the error correction code words below are used.
When the number of the code words exceeds 928, or when the number of lines exceeds 90, the symbols are not drawn.
For the MicroPDF417, the numbers of rows and columns can be specified. The maximum number of digits varies according to the setting.
In the case of PDF417
• Extended Alphanumeric Compaction (EXC) mode: 1850 digits
• Binary/ASCII Plus mode: | 1108 digits |
• Numeric compaction mode: | 2000 digits |
In the case of MicroPDF417 |
|
• Binary mode: | 150 digits |
• Upper case letter/space mode: | 250 digits |
• Numeric compaction mode: | 366 digits |
No. of Error Correction Code Words of PDF417 | 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 | Low | 2 | |
Level 2 |
| 6 | |
Level 3 |
| 14 | |
Level 4 |
| 30 | |
Level 5 |
| 62 | |
Level 6 |
| 126 | |
Level 7 | High | 254 | |
Level 8 |
| 510 |
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