Intermec Trakker Antares 2420, Руководство пользователя, Страница: 456 / 480

TRAKKER Antares 2420 and 2425 Hand-Held Terminal User’s Manual
G-18
power management
Software and procedures that extend the life of a terminal’s lithium-ion main battery pack
and NiCad backup battery.
preamble
Predefined data that is automatically appended to the beginning of entered data. Similar
to the “postamble.”
protected field
In word processing, preset data or an area that cannot be changed or overridden by an
operator without altering the program. On a display device, a display field in which a
user cannot enter, modify, or erase data. Contrast with “unprotected field.”
protocol character
See ASCII control character.
protocol stack
A group of drivers that work together to span the layers in the network protocol
hierarchy.
PSK
TRAKKER Antares Programmer’s Software Kit. A library of software functions for
creating applications on the TRAKKER Antares 2420 and 2425 terminals.
radio frequency (RF)
A frequency at which coherent electromagnetic radiation of energy is useful for
communications purposes; roughly the range from 10 KHz to 300 GHz.
RAM
Random access memory. Memory that can be written into, or read, by locating any data
address.
RAM drive
A configurable disk drive that exists only in your terminal’s extended memory. You
create, read, write, and delete files on a RAM drive the same way you can on a hard disk
drive. You can disable the RAM drive and use the additional 256K for programmable
(Malloc) memory allocations, or configure the RAM drive to temporarily store data and
files. The contents are destroyed when you boot or reset the terminal.
reader command
A reader command causes the terminal to perform a task. You can enter a reader
command by typing on the keypad, by scanning a bar code label, or by sending a
command from a device on the 2.4 GHz network.