Symbol PTC-2124, Руководство пользователя, Страница: 102 / 114

Chapter 3 Configuring TN-3270/5250
90 PTC-2124 User’s Guide
data card
A credit-card-size electronic device used to hold data
and programs.
data communication
The transport of encoded information from one device
to another.
digital D
iscrete variable pulses or signal levels that
represent continuously variable physical quantities.
Contrast with analog.
digitizer
A device that is mounted above the PTC’s LCD. It
enables the unit to recognize data entered with your
finger or the PTC’s stylus.
display
The LCD on a PTC. A PTC’s display shows data,
prompts, and error messages.
DOC
Department of Communications—Canada.
DSR
Data set ready signal. The modem sends DSR to the
attached device to indicate that the modem is
connected, on, and ready.
DTR
Data terminal ready signal. The signal sent by the
terminal device to the modem to indicate that the
terminal is ready for transmission.
EPROM
Erasable programmable read-only memory.
ESD
Electrostatic discharge.
FCC
Federal Communications Commission—U.S.A.
field
An area on the PTC’s screen in which data can be
written.
file
Any group or collection of related information stored
in memory. To add data to a file or to read data from a
file, the program must access the file by its file name.
flash EPROM
A type of erasable programmable read-only memory
that can be erased and reprogrammed electronically
while installed in a PTC.