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Appendix D
C
character cell The invisible rectangular space occupied by a character,
including the white space around the character. The
height of a cell remains constant even with changes in
the current line spacing, and the width is equal to the
current character spacing. Used as a unit of spacing.
character proportion The ratio of character height to character width.
See also compressed and expanded.
character set A set of codes, each of which represents a printable
character, including symbols, punctuation, numbers,
diacritical markings, and alphabet characters. Each
character is assigned a unique code value.
character weight The degree of lightness and thickness of printed text. For
example: “Bold” refers to a heavy or thick character
weight. “Medium,” “normal,” or “book weight” refer to the
character weight used in this sentence.
checksum A stored or transmitted numerical value used to verify
data integrity.
command sequence Two or more bytes that instruct the printer to perform a
special function. The first character in the sequence is a
special function control character (SFCC), which alerts
the printer that the string is a command sequence.
See also escape sequence, SSCC, and SFCC.
compatibility The ability of one printer to accept and properly process
commands meant for a different printer.
See also emulation and protocol.
compressed Refers to a typeface with a font width approximately 60%
smaller than normal. Character height is not changed.
configuration Refers to the operating properties that define how the
printer responds to signals and commands received from
the host computer at the printer interface. These
properties are called configuration parameters and must
be set to match the operating characteristics of the host
computer system.
controller An independent logic unit in a data processing system
that controls data paths between the central processing
unit and one or more units of peripheral equipment.
cpi Abbrev. for characters per inch. A measurement of
monospaced fonts indicating the horizontal character
density. For example, 10 cpi means 10 characters can be
printed in one horizontal inch.
See also pitch.
cps Abbrev. for characters per second. A measurement of
the print speed of a serial (character) printer.