codes, and expanded characters, create other graphics,
and merge graphics with alphanumeric data as a
document is printed.
command. An instruction, such as a form feed
command, sent from a computer to the printer
(sometimes called a control code or non-printable
character). As opposed to data, which is information to
be printed.
command delimiter. An ASCII character used to begin
a command string (same as SFCC). Commonly used
command delimiters are ESC (X'1B' hex) and SOH
(X'01' hex).
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 sequence.
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. Characters per inch. A unit of measurement of
monospaced fonts indicating the horizontal density. For
example, 10 cpi means 10 characters can be printed in
one horizontal inch.
cps. Characters per second. A measurement of the
print speed of a serial (character) printer.
CPU. Central Processing Unit.
CR. Carriage Return.
CT0. Abbreviation for Coax/Twinax only. A model
available in a previous generation of the IBM Line
Matrix Printer.
CTA. Abbreviation for Coax/Twinax/ASCII.
CTS. Clear To Send.
CVFU. Abbreviation for Centronics direct access
Vertical Format Unit.
D
DAVFU. Abbreviation for Direct Access Vertical
Format Unit. Also known as NVFU. See also NVFU.
DC. Data Controller.
DCD. Data Carrier Detect.
decipoint. One tenth of a point. A unit of length equal
to 1/720 inch. See also point.
default. A value, parameter, attribute, or option that is
used by a program or system if another is not specified
by the user.
descender. The portion of a printed, lowercase
character that appears below the base line. For
example, “g”, “j”, “p”, and “y” are characters with
lowercase descenders.
diagnostic. Pertaining to the detection and isolation of
a printer malfunction or mistake.
disable. To deactivate, make “false” (0) or set to OFF.
DP. Abbreviation for data processing print. This is a
mid-quality, mid-speed print resolution.
draft. A limited dot font used for rough copy. Low
print quality but fast print speed.
DRAM. Dynamic Random Access Memory.
DSR. Data Set Ready.
DTR. Data Terminal Ready.
DVFU. Abbreviation for Dataproducts direct access
Vertical Format Unit.
E
EBCDIC. Extended Binary Coded Decimal
Interchange Code.
EC. Engine Controller.
ECMA. European Computer Manufacturers
Association.
EIA. Electronic Industries Association.
Elite. A name indicating a monospaced font with a
pitch of 12 cpi (and usually 10 points in height).
em. A unit of measure in typesetting. The width of a
piece of type about as wide as it is tall. (Derived from
uppercase M, usually the widest character in a set.)
EM. End of Message (3287 only).
288 Infoprint 6500 User’s Manual
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