PSC QuickScan 1000, Руководство по программированию

Страница: 72 / 97

66
QuickScan™ 1000 Programming Guide
S
YMBOLOGY
S
ELECTION
Standard 2 of 5
The Standard 2 of 5 symbology has the following programmable features:
Check Digit — calculates the Check Digit to verify that the Check Digit
contained in the bar code label is correct. If you enable this feature, your bar
codes must contain a Check Digit.
You may also choose to transmit or not transmit the Check Digit indepen-
dent 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.
The
Transmit Check Digit
option has no effect unless the
Compute Check Digit
option is enabled.
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 Standard 2 of 5 limits.
Standard 2 of 5 Label Lengths
Standard 2 of 5 Minimum Label Length — sets the minimum label length
required for Standard 2/5 labels (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 a number of digits between 04 and 50 digits 1 .
Note: The Variable Length Label feature must be DISABLED in
order that Fixed Label Length features can work.
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 number of digits between 04 and 50 digits
1 (including check
character).
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.