Diagraph PA/4000, Service Manual, Page: 139 / 213

download -Transmission of data from a central computer to a smaller computer or a
computer at a remote site. To upload is the exact opposite.
downtime—Periods of time when a computer or manufacturing system is not
available to perform work.
dpi—dots per inch.
element—Single bar or space in a bar code. A combination of elements makes up a
character.
executable file—Computer files of machine readable instructions that cannot be
accessed or edited using a normal editor. They typically have a extension of .EXE.
ETX—ASCII control code for the end of text. A signal that specifies the end of a text
string.
field—Pre-determined section of a record that contains a specific portion of
information.
file—Computer term for a named set of data items stored in machine-readable form.
firmware—Computer programs, instructions or functions implemented in user-
modifiable hardware. Programs and instructions stored permanently in
programmable, read-only memories, constitute a fundamental part of the system
hardware.
flush left—Text with an even left margin and an uneven, ragged right margin.
flush right—Text with an even right margin and an uneven, ragged left margin.
font—A complete set of characters—alphabetic, numeric, and punctuation—in one
typeface. The font of this glossary is Times.
friction bearers—Tire(s)on the edge of encoder cylinders.
full duplex—Transmission of data in two directions simultaneously.
half duplex—Transmission of data in only one direction at a time.
handshaking—The exchange of signals between computers that acknowledges
compatible protocol for data exchange.
header—Text or graphics that appear on the top of a page, such as the chapter or
section title.
Hertz (HZ)—A unit of measurement for frequency or bandwidth. 1HZ=1
cycle/second
HMIS—Hazardous Material Information Sheet
host computer—Primary computer in a multi-computer network. The unit issues
commands, has access to the most important data and is the most versatile
processing element in the system.
human readable text—The text in a spoken language associated with a bar code.
Hz ( see Hertz)
I 2 of 5—Short form of “Interleaved 2 of 5”. System using five bars and their spaces.
Each character is represented by five characters or five spaces and two of the five
elements are wide.
Interleaved 2 OF 5—Numeric only bar code with an even number of characters.
Interleaved 2 OF 5 MOD 10 (SCS) —Bar code that conforms to the UPC Council
Shipping Container Standard for labeling corrugated shipping containers. It is
numeric only, with an even number of characters and employs a Mod 10 check
digit for greater data integrity.
justified—Text that has even left and right margins. See also Flush left and Flush right.