Symbol SE 923, Integration Manual

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Glossary-2
SE-923 Scan Engine Integration Guide
Byte On an addressable boundary, eight adjacent binary digits (0 and 1)
combined in a pattern to represent a specific character or numeric
value. Bits are numbered from the right, 0 through 7, with bit 0 the low-
order bit. One byte in memory can be used to store one ASCII character.
CDRH Center for Devices and Radiological Health. A federal agency
responsible for regulating laser product safety. This agency specifies
various laser operation classes based on power output during
operation.
CDRH Class 1 This is the lowest power CDRH laser classification. CDRH Class 1
devices are safe under reasonably foreseeable conditions of operation.
Software and other controls to limit exposure to laser light may be
required to achieve CDRH Class 1 operation. The CDRH time base
for Class 1 devices is 10,000 seconds.
CDRH Class 2 CDRH Class 2 devices may not emit more than 1 milliwatt average
radiant power. For this scan engine, additional software controls are
not necessary. Eye protection for CDRH Class 2 devices is normally
afforded by aversion responses, including the blink reflex.
Character A pattern of bars and spaces which either directly represents data or
indicates a control function, such as a number, letter, punctuation mark,
or communications control contained in a message.
Character Set Those characters available for encodation in a particular bar code
symbology.
Check Digit A digit used to verify a correct symbol decode. The scanner inserts the
decoded data into an arithmetic formula and checks that the resulting
number matches the encoded check digit. Check digits are required for
UPC but are optional for other symbologies. Using check digits
decreases the chance of substitution errors when a symbol is decoded.
CLSI Editing An option which inserts a space after the 1st, 5th, and 10th characters
of a 14-character Codabar symbol. Length includes start and stop
characters.
Codabar A discrete self-checking code with a character set consisting of digits 0
to 9 and six additional characters: ( - $ : / , +).
Code 128 A high density symbology which allows the controller to encode all 128
ASCII characters without adding extra symbol elements.