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Chapter 1
Introduction
Bar coding is the most common Automated Data Collection (ADC) technology
providing timely, error-free information that can be used to increase productivity,
accuracy, and efficiency in the workplace. Virtually every type of industry is using
bar codes to replace keyboard data entry. Studies have shown that a proficient data
entry operator will make one error for every 300 characters that are manually
entered. The error rate using bar codes is almost negligible and can be
error-free using bar code symbologies with the check digit enabled.
The Wasp Charged Coupled Device (CCD) technology is a technique whereby
a bar code is photographed, digitized, and electronically sampled by built-in
photodetectors. The detectors process the measurement of every bar and space
using the number of adjacent photodetectors which contrast a black mark and a
white space. Wasp WLP 4170 CCD is extremely rugged since it has no moving
parts. Wasp WLP 4170 CCD reader supports PC AT/XT and PS/2 keyboard
interfaces and easily wedges between the computer and keyboard. Bar code data
is passed directly into the keyboard buffer as if it had been typed in by hand by a
data entry operator.
Of all the hand held bar code scanning devices on the market, the CCD reader is
the easiest to use and most cost effective for the typical business user. To activate
the scanner, the user simply points the scanning aperture towards the bar code,
pulls the trigger, and aims the red LED beam across the bar code.
5
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