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frequency-hopping (FH) radio
A type of spread spectrum radio that continually
jumps from one frequency to another to avoid
interference.
GND
Ground.
hard boot
To turn off and completely reset the PTC. A hard boot
clears RAM, so any data or programs stored in RAM
memory are erased.
hardware
Equipment used in conjunction with programs or data
communication. Contrast with software.
host computer
A personal computer or mainframe that receives and
processes data from remote PTCs.
Hz
Hertz. A unit of frequency equal to one cycle per
second.
interface
The connection between two devices, defined by
common physical characteristics, signal
characteristics, and signal meanings. Types of
interfaces include RS-232 and PCMCIA.
I/O
Input/output.
LAN
Local area network. A radio network that supports
data communication within a local area, such as
within a warehouse or building. Contrast with WAN.
laser scanner
A type of bar-code reader that uses a beam of laser
light.
LCD
Liquid crystal display.
LED
Light-emitting diode.
lithium-ion battery
A type of rechargeable battery used to power some
PTCs, including the PTC-2124. The advantage of
lithium-ion batteries (over nickel-cadmium batteries)
is their increased capacity in comparable weight and
volume.
mA
Milliamperes.
PTC-2124 User's Guide
91
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