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Aperture
The opening in an optical system defined by a lens or baffle that
establishes the field of view.
Auto Identification Machinery
AIM
American Standard Code for Information Interchange. A 7 bit-plus-
ASCII
parity code representing 128 letters, numerals, punctuation marks,
and control characters. It is a standard data transmission code in the
U.S.
Auto-
The ability of an interface controller to determine the code type of a
scanned bar code. After this determination is made, the information
discrimination
content is decoded.
Bar
The dark element in a printed bar code symbol.
Bar Code
The number of characters represented per unit of measurement
(e.g., characters per inch).
Density
Bar Height
The dimension of a bar measured perpendicular to the bar width.
Bar Width
Thickness of a bar measured from the edge closest to the symbol
start character to the trailing edge of the same bar.
Baud Rate
A measure of the data flow or number of signaling events occurring
per second. When one bit is the standard "event," this is a measure
of bits per second (bps). For example, a baud rate of 50 means
transmission of 50 bits of data per second.
Bit
Binary digit. One bit is the basic unit of binary information.
Generally, eight consecutive bits compose one byte of data. The
pattern of 0 and 1 values within the byte determines its meaning.
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
loworder bit. One byte in memory is used to store one ASCII
character.
50 | APPENDIX H: GLOSSARY
Appendix H Glossary
A
B
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