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A-2
CELL-DYN
®
3200 System Operator’s Manual
9140181H—October 2001
Bar Codes
Overview
Appendix A
Understanding the Label’s Code
In all bar code symbologies, the code consists of elements (single bars or white
spaces) and characters (groups of elements that stand for numbers or letters). In
code 39, a commonly used symbology, each code character contains nine elements,
at least three of which must be wide. Wide elements (whether they are bars or
spaces) in this symbology have a binary value of 1. Narrow elements have a binary
value of 0.
Most contemporary bar code systems have several features in common. These
include the following:
• The
Quiet Zone
is the area immediately before and after the bar code symbol.
This zone enables the scanner to read the code properly.
•
Start and Stop Characters
indicate the beginning and end of the bar code
symbol. They allow the label to be scanned from either right to left or left to
right, ensuring that code information is transmitted correctly.
•
Intercharacter Gaps
act as spaces between each character in the bar code
symbol. Code 39 contains these gaps. However, there are other codes, such
as Interleaved 2 of 5, that do not use them.
• The
Interpretation Line
is an area at the bottom of the bar code label where
human-readable information can be placed. This may or may not be the same
data as in the label code.
• The
Check Digit
is an extra numeric character in the bar code that permits the
scanning device to mathematically determine whether it read the code
correctly. This keeps the error rate as low as one for every billion characters
scanned.
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Страница 132: ...3 38 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Principles of Operation References Section 3 NOTES ...
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Страница 234: ...5 82 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Operating Instructions Run Menu Section 5 NOTES ...
Страница 300: ...6 2 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Calibration Procedures Overview Section 6 NOTES ...
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Страница 362: ...8 2 CELL DYN 3200 System Operator s Manual 9140181K July 2002 Hazards Overview Section 8 NOTES ...
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Страница 372: ...9 2 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Service and Maintenance Overview Section 9 NOTES ...
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Страница 560: ...12 2 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Printers Overview Section 12 NOTES ...
Страница 566: ...13 2 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Sample Loader Overview Section 13 NOTES ...
Страница 590: ...14 2 CELL DYN 3200 System Operator s Manual 9140181H October 2001 Reticulocyte Package Overview Section 14 NOTES ...
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