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(15) Explanation for Data Matrix
ECC type
Data Matrix contains a function to correct a code reading error using an error
correction code (ECC) and restore normal data. Since there are several ECCs. ECC
should be designated according to usage. The general correction ability is as follows.
However, it may vary according to the error conditions.
ECC type Overhead by ECC
ECC200 Approx. 30%
Format ID No function (Ignore)
Maximum number of digits
The maximum number of digits varies according to the ECC type. Since each Kanji
character uses 2 bytes, the maximum number of digits for it becomes half of the
following values.
Numeric Alphanumeric 8 bit
ECC200 2000 2000 1556
For the maximum number of digits in cell units, see the next page.
Connection setting
The connection setting is used to comprise data with a set of two-dimensional codes
when the data cannot be expressed with a two-dimensional code. When three two-
dimensional codes are used to comprise data, identification information of 1/3, 2/3,
and 3/3 is inserted into each two-dimensional code. The ID number is programmed to
include a proper combination of two-dimensional codes when one label contains plural
connecting symbols. For example, when there are two kinds of data containing
identification information for 1/2 and 2/2 in the same label, combination of two-
dimensional codes is unclear. By adding the ID number, the combination is made
clear.