Motorola MC7090CN User Manual page 111

Chapter 1
Glossary
Glossary
A
API. An interface by means of which one software component communicates with or controls another. Usually
used to refer to services provided by one software component to another, usually via software interrupts or
function calls
Aperture. The opening in an optical system defined by a lens or baffle that establishes the field of view.
Application Programming Interface. See API.
ANSI Terminal. A display terminal that follows commands in the ANSI standard terminal language. For
example, it uses escape sequences to control the cursor, clear the screen and set colors. Communications
programs support the ANSI terminal mode and often default to this terminal emulation for dial-up
connections to online services.
ASCII. American Standard Code for Information Interchange. A 7 bit-plus-parity code representing 128 letters,
numerals, punctuation marks and control characters. It is a standard data transmission code in the U.S.
Autodiscrimination. The ability of an interface controller to determine the code type of a scanned bar code.
After this determination is made, the information content is decoded.
B
Bar. The dark element in a printed bar code symbol.
Bar Code. A pattern of variable-width bars and spaces which represents numeric or alphanumeric data in
machine-readable form. The general format of a bar code symbol consists of a leading margin, start
character, data or message character, check character (if any), stop character, and trailing margin. Within
this framework, each recognizable symbology uses its own unique format. See Symbology.
Bar Code Density. The number of characters represented per unit of measurement (e.g., characters per inch).
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.
Glossary