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Operator's Guide G-3
DATA BITS
. Defines the number of data bits in each byte transmitted. A
setting of 7 data bits is used to send ASCII characters 0 through 127. A
setting of 8 data bits is required for sending graphics data and data byte
values between characters 128 through 255.
DATA BYTE
. A string of 7 or 8 bits that represents one character.
DATA BYTE ACTION MAP
. Describes whether a data byte value between 0
and 255 is currently defined as a control code or a printable character.
DATA BYTE MAP
. A group of five maps in printer memory that describe the
action the printer is currently set to perform when it receives a data byte.
A complete data byte map consists of the data byte action map, the
control code map, the character source map, the character library map,
and the character number map.
DECENDERS
. That part of a character that falls below the character's
baseline. Also, a term used to describe a subscript character.
DECIMAL
. The numbering system that uses the numerals 0 to 9.
DEFAULT
. A value or setting that is used if no alternate setting is specified.
Default settings are in effect when the printer is turned on or reset.
DOWNLOAD
. To send data from the computer to the printer.
DTR
. Data Terminal Ready (DTR) is a hardware handshaking protocol in
which a receiving device controls data flow by changing the voltage level
on a signal wire.
ERASEABLE PROGRAMMABLE READ ONLY MEMORY
(
EPROM
)
. A specific type of
ROM. The printer uses a 128K x 8 bit EPROM for storing the software
that has been electronically programmed into this ROM
device. A
programmed EPROM is sometimes referred to as "firmware."