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2 SYSTEM OPERATION
SM30 Sound Management System presents
the operator with a logical, comprehensive,
and easy to use method of routing and
broadcasting calls, announcements, pre-
recorded messages, and music.
SM30 is easy to use and logical in its
operation, but it is perhaps helpful to
understand, in principle, how the system
works.
A Typical Operation
Herewith a typical series of actions, initiated
by the person (“the operator”) making an
announcement, a paging call, etc., and
carried out by the system.
1 The operator selects in which loudspeaker
zones the call must be broadcast. This is
done by simply typing in the number of
each desired zone using the Numeric
Keypad of the Call Station. The Zone
Routing Indicator LEDs for these zones
will illuminate.
2 The microprocessor, which is continu-
ously monitoring the system, sees which
key is pressed. First it looks to see
whether another call is currently being
broadcast. If so, the processor activates a
flashing ‘BUSY’ LED on the call station.
3 When the ‘PRESS TO TALK’ key is
pressed, the processor checks which
priority rating each Call Station,
Function Key, microphone, etc., has been
given, and if the original caller has a
lower priority than the one being made,
its call will be muted and overridden by
the new caller. If the call being made has
the same, or a lower priority than the
original caller, the new call will be
ignored, and the ‘BUSY’ led will be
constantly illuminated to advise the
operator that the call has been aborted.
Pressing the ‘REDIAL’ key will automati-
cally reselect the zones which were last
selected, eliminating the need to type
them in again.
4 If all is clear, the processor mutes any
music signal which may be broadcast in
the zone(s). Music routed to any other
zones will not be affected.
5 The processor checks which attention
tone has been programmed to precede an
announcement originating from the Call
Station, then it switches on the built-in
signal generator; selects a tone; and feeds
it out to the amplifier input.
6 If a message, recorded on the Recorded
Message Module, has been programmed
to precede a call, it will be broadcast after
the attention signal, and before the call.
Meanwhile the processor energises a
flashing green ‘WAIT/TALK’ LED in
order to tell the user that the call is going
through, but that they will have to wait
until the attention signal, or recorded
message, has finished.
7 The output signal of the amplifier is then
input into the SM30 Control Centre, via
its Zone Relay Module (a processor
controlled routing/switching matrix),
which routes it out again to the selected
loudspeaker zones.
8 When the announcement is completed
and the ‘PRESS TO TALK’ key is
released, the system returns to its idle
mode, with the processor continually
monitoring the system, until another call
is made. If music was playing in the
zone(s) it will return at its original
volume level.
Activation of Control Relays
Generating a call could also activate a relay,
or set of relays, which can be used to switch
on (or off) external equipment.
GB/SM 30 user manual 5/26/98 10:17 AM Page 4