PSC QuickScan 1000, Руководство по программированию

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QuickScan™ 1000 Programming Guide
S
YMBOLOGY
S
ELECTION
Interleaved 2 of 5
The Interleaved 2 of 5 symbology has the following programmable features:
Check Digit — calculates the Check Digit to verify that the Check Digit
contained in the barcode label is correct. If you enable this feature, your
barcodes must contain a Check Digit.
You may also choose to transmit or not transmit the Check Digit
independent of whether the Check Digit is calculated by the scanner. The
Transmit Check Digit will have no effect unless the Compute Check Digit
feature is enabled. If you choose Don’t Compute Check Digit , the scanner
sends the Check Digit encoded in the bar code without verifying its
accuracy. If you choose both
Compute Check Digit and Don't Transmit Check
Digit , the scanner will remove the Check Digit's contents before sending
the bar code data to the host.
Label Format — provides the selection between fixed or variable length
labels. If your application has labels with specific fixed lengths, we
recommend selecting fixed lengths to improve read rate and avoid short
reads.
You can select any valid number of digits for reading specific length labels
only. Read the following details for specific Interleaved 2 of 5 limits.
Interleaved 2 of 5 Label Lengths
Interleaved 2 of 5 Minimum Label Length — sets the minimum label
length required for I 2/5 labels (not including the check character). This
feature is provided to ignore small label segments, reducing the possibility
that a portion of a good label is incorrectly seen as an entire label.
Variable Length — if you select variable length, the scanner will recognize
labels with an even number of digits between 04 and 50 digits
1
.
Fixed Length — if you select fixed length, there are three labels for program-
ming your scanner to read either one or two fixed lengths. The labels are:
• Set First Fixed Length — use this label to instruct the scanner that the
next two programming labels you scan will define the first fixed label
length. This setting can be any even number of digits between 04 and 50
digits
1
.
1 The scanner will decode up to 50 characters, but the actual length read will vary
depending upon bar code size and quality. The IBM POS interface is limited to 32
character labels.