22
Application Creation
Bar code properties (cont.)
Read Redundancy
Read redundancy is a method by which the scanner can reliably determine that the data
gathered is accurate by conducting multiple scans of the information. The default setting is
none. If the read redundancy setting is set to once, the scanner will decode the bar code
one additional time, and if the decoded information of both scans is identical than the data
collected is determined to be “good data”.
It is important to note that increasing the level of read redundancy will
reduce the scan rate of the Optimus. The bar code decoding (scanning)
ability of the scanner will be prolonged to verify the data being scanned.
Code Type
These settings establish all of the bar code types that are active for the application program.
Only the active bar code types will be scanned. All inactive code types will be disregarded
and will not scan.
Industrial / Interleave / Matrix 25
Interleaved 2 of 5 is a high density variable length numeric only symbology that encodes
digit pairs in an interleaved manner. The odd position digits are encoded in the bars and
the even position digits are encoded in the spaces. Because of this, I 2 of 5 bar codes
must consist of an even number of digits. Also, because partial scans of I 2 of 5 bar
codes have a slight chance of being decoded as a valid (but shorter) bar code, readers
are usually set to read a fixed (even) number of digits when reading I 2 of 5 symbols. The
number of digits are usually pre-defined for a particular application and all readers used
in the application are programmed to only accept I 2 of 5 bar codes of the chosen length.
Shorter data can be left padded with zeros to fit the proper length.
Interleaved 2 of 5 optionally allows for a weighted modulo 10 check character for special
situations where data security is important.
Start / Stop Selection
This parameter provides the readability of all
25 code variants. For example, flight tickets
actually use an Industrial 25 bar code but
with Interleave 25 start / stop. In order to
read this bar code, the
start / stop selection
parameter of Industrial 25 should be set to
‘
Interleave 25’
.
Checksum Verification
Specifies whether the scanner will perform
checksum verification when decoding bar
codes. If the checksum is incorrect, the bar
code will not be read.
Figure 12
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