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. |
166
