Symbol PTC-2124, User Manual

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PTC-2124 User’s Guide 89
Glossary
analog
Continuously variable physical quantities, such as
temperature and noise. Contrast with digital.
application
A PC, mainframe, or PTC program that is designed to
perform a specific task for a user. Examples include
route accounting, payroll, price lookup, shipping, and
inventory control.
bar code
A series of vertical bars and spaces used to encode
numeric or alphanumeric information. Bar codes are
designed to be read by electronic means such as bar-
code readers or laser scanners.
bar-code reader
An electrical device that recognizes and deciphers bar-
code labels. When the reader passes over the bar code,
it converts the bar code into electronic signals
representing data. The PTC can then enter these data
into files in its memory.
BIOS
Basic Input/Output System.
boot or boot-up
The process a PTC goes through when it first starts
up. During boot-up, the PTC can run self diagnostics
and configure hardware and software.
bridge battery
A battery used to protect data in the PTC’s memory
when the main battery pack is removed.
byte
A group of eight bits that acts as a basic unit for
information transfer and storage.
CD
Carrier detect signal. CD indicates that the modem is
receiving a signal from the remote modem.
CTS
Clear-to-send signal. CTS indicates that the line
between a modem and a terminal device is clear for
transmission. CTS typically follows a raised request-
to-send (RTS) signal.