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SM30 plug-in modules
All of the interconnections between
individual modules in the Control Centre
take place automatically when they are
plugged into the interconnection board of
the Control Centre, so that no complex
inter-wiring is required. Owing to the
unique construction of the housing, the
modules slide in and out quickly and easily.
These features make SM30 simple and
inexpensive to install and maintain.
All switching and routing of the system is
carried out by software, so that hard-wiring
problems are kept to a minimum. This
means that though SM30 comprises a great
amount of features, making it a
comprehensive Public Address Centre, the
unit itself is uncluttered and simple to
assemble and use.
Call Station
The Call Station is the primary input to the
system, allowing the operator to route and
broadcast calls, announcements and music.
Each Call Station includes:
■ An electret condenser microphone.
■ A Numeric Keypad, allowing individual
selection of up to 18 loudspeaker zones
by typing in the zone number. Each Call
Station can be programmed with a
priority status, attention tone and pre-
recorded message. These become
operational whenever the keypad is used
to route a call.
■ Zone Selection Indicator.
Each zone has its own LED which is
illuminated when the zone is selected.
When the call is completed the LEDs will
be extinguished.
■ 4 Function Keys.
Programmable with: priority; alarm and
attention tones; pre-recorded messages;
routing to loudspeaker zones; and
Control Relay activation.
■ Alternative functions.
These include music volume up/down;
music source selection; music mute; and
independent Control Relay switching or
toggling.
Using the Function Keys to make a call is
done in the same way as using the Key-pad.
The main difference being that instead of
the operator selecting the zones using the
Numeric Keypad, the Function Keys route
the call to a pre-programmed selection of
zones.
This of course saves a great amount of time
when an operator has to frequently call the
same selection of zones, or when an “ALL
CALL” must be made in emergencies.
Signal generator
Built into the SM30 Control Centre is a
signal generator, programmed with attention
tones and alarm signals. These can be
programmed, via the User Menu, to precede
a call or pre-recorded message, or to be
activated independently.
Background music
Background music sources, such as a
background music player, a radio tuner, a
compact disc player, a cassette deck, etc. are
connected and pre-adjusted.
Emergency Power Supply +48 VDC
In situations where the mains power supply
is unreliable, and SM30 is used for
security/evacuation purposes, an emergency
power supply may be used. This will be
switched on automatically whenever the
mains power fails.
Block diagram
The block diagram of a SM30 system is
shown in fig.1.
GB/SM 30 user manual 5/26/98 10:17 AM Page 2