Symbol Technologies LS 2106 manual Byte, Cdrh Class, Character Set, Check Digit

LS 2106 Product Reference 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. This class is
	considered intrinsically safe, even if all laser output were directed
	into the eye's pupil. There are no special operating procedures for this
	class.
CDRH Class 2	No additional software mechanisms are needed to conform to this
	limit. Laser operation in this class poses no danger for unintentional
	direct human exposure.
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.
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.

Code 3 of 9 (Code 39) A versatile and widely used alphanumeric bar code symbology with

	a set of 43 character types, including all uppercase letters, numerals
	from 0 to 9, and 7 special characters (- . / + % $ and space). The code
	name is derived from the fact that 3 of 9 elements representing a
	character are wide, while the remaining 6 are narrow.
Code 93	An industrial symbology compatible with Code 39 but offering a full
	character ASCII set and a higher coding density than Code 39.

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