User Manual

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M ISO Master In Slave Out; used by th e slave device to sen d data to th e m aster device.
M OSI Master Out Slave In ; used by th e m aster device to sen d data to th e slave device.
OM PAC Over-Molded P ad-Array Carrier; a Motorola custom IC package, distin guish ed
by th e presen ce of solder balls on th e bottom pads.
Open Archit ect ure A con troller con figuration th at utilizes a m icroprocessor with exten ded ROM,
RAM, an d EEPROM.
OSW Outboun d Sign allin g Word; data tran sm itted on th e con trol ch an n el from th e
cen tral con troller to th e subscriber un it.
PC Board Prin ted Circuit board
PL Private-Lin e
®
ton e squelch ; a con tin uous sub-audible ton e th at is tran sm itted
alon g with th e carrier.
PLL Ph ase-Locked Loop; a circuit in wh ich an oscillator is kept in ph ase with a
referen ce, usually after passin g th rough a frequen cy divider.
PTT Push -To-Talk; th e switch located on th e left side of th e radio wh ich , wh en
pressed, causes th e radio to tran sm it.
Regist ers Sh ort-term data-storage circuits with in th e m icrocon trol un it or
program m able logic IC.
Repeat er Rem ote tran sm it/receive facility th at re-tran sm its received sign als in order to
im prove com m un ication s coverage.
RESET Reset lin e; an in put to th e m icrocon troller th at restarts execution .
RF PA Radio Frequen cy P ower Am plifier
RSS Radio Service Software
RPT/ TA RePeaTer/Talk-Aroun d
RX DATA Recovered digital data lin e.
Signal Qualifier
M ode
An operatin g m ode wh ereby th e radio is m uted but still con tin ues to an alyze
receive data to determ in e RX sign al type.
SCI IN Serial Com m un ication In terface INput lin e
SLIC Support-Logic IC; a custom gate array used to provide I/O an d m em ory
expan sion for th e m icrocon troller.
Soft pot Software poten tiom eter; a com puter-adjustable electron ic atten uator.
Soft w are Com puter program s, procedures, rules, docum en tation , an d data pertain in g
to th e operation of a system .
SPI Serial P eriph eral In terface; h ow th e m icrocon troller com m un icates to
m odules an d ICs th rough th e CLOCK an d DATA lin es.