character set. (1)A finite set of different characters that is complete for a given purpose; for example, the character
set in ISO Standards 646, “7-bit Coded Character Set of Information Processing Interchange.” (2)A group of
characters used for a specific reason; for example, the set of characters a printer can print. character set.
code page. Afont library member that associates code points and character identifiers.
code point. An element of a code page or site in a code table to which a character can be assigned.
command. Acontrol signal that initiates an action or the beginning of a sequence of actions.
configuration. The arrangement of a computer system or network as defined by the nature, the number,and the
chief characteristics of its functional units. More specifically,the term configuration may refer to a hardware
configuration or a software configuration.
configure. The procedure used to customize the printer to a specific operating and/or communication environment.
connector. Amechanical device for establishing electrical flow.
constant data. Data that does not change; for example, the company letterhead and standard text in form letters, or
the headings and boxes on a preprinted form. Contrast with

variable data

.
constant-spaced font. Afont in which the graphic characters are contained in character cells of uniform size. The
distance between reference points of adjacent graphic characters is constant in the in-line progression. The white
spaces between graphic characters may vary.Synonymous with

fixed-space font

. Contrast with

proportionally-spaced

font

.
controlling computer. Theprocessing unit to which the printer is attached through a communication attachment.
controlling computer system. The data processing system to which a network is connected and with which the
system can communicate.
control storage. Aportion of storage that contains microcode and other data.
control unit (CU). (1)A device that controls input and output operations at one or more devices. (2) The electronics
and code that control the printer and the communication attachment.
CPI. characters-per-inch
CU. See

control unit

.
curl. See

paper curl

.
customer engineer (CE). An IBM service representative who performs maintenance services for IBM hardware.
Synonymous with

IBM service representative

.
cut-sheet paper. Paperthat, unlike continuous forms, is cut into sheets.
D
data stream. (1)All data transmitted through a data channel in a single read or write operation. (2) A continuous
stream of data elements being transmitted, or intended for transmission, in character or binary-digit form, using a
defined format.
default. An alternative value, attribute, or option that is assumed when none has been specified.
degraded operation. Aloss in performance caused by environmental or system conditions.
diagnostic. Pertaining to the detection and isolation of errors in programs and faults in equipment.
disable. Tomake non-functional. Contrast with

enable

.
DOD. document on demand.
DP. dataprocessing. This describes the quality of certain fonts.
286 4247 Printer ModelA00 User’s Guide