Motorola PM1200, Руководство по установке

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October, 2007 6880309U11
Glossary-5
RX DATA Recovered digital data line.
Serial
Communication
Interface Input Line A full-duplex (receiver/transmitter) asynchronous serial interface.
Serial Peripheral
Interface Interface used by the microcontroller to communicate modules and ICs.
signal An electrically transmitted electromagnetic wave.
softpot See software potentiometer.
software Computer programs, procedures, rules, documentation, and data
pertaining to the operation of a system.
software
potentiometer A computer-adjustable electronic attenuator.
spectrum Frequency range within which radiation has specific characteristics.
SPI See Serial Peripheral Interface.
squelch Muting of audio circuits when received signal levels fall below a pre-
determined value. With carrier squelch, all channel activity that exceeds
the radio’s preset squelch level can be heard.
SRAM See static RAM.
Standby mode An operating mode in which the radio is muted but still continues to
monitor data.
static RAM A type of memory used for volatile, program/data memory that does not
need to be refreshed.
time-out timer A timer that limits the length of a transmission.
TOT See time-out timer.
transceiver Transmitter-receiver. A device that both transmits and receives analog
or digital signals. Also abbreviated as XCVR.
transmitter Electronic equipment that generates and amplifies an RF carrier signal,
modulates the signal, and then radiates it into space.
TX Transmit.
UHF Ultra-High Frequency.
Term Definition