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6 CALL STATION
(CST) LBB 9568
The SM30 Call Station presents the
operator with a logical, comprehensive, and
easy to use method of routing and
broadcasting calls, announcements, and
music. Since each Call Station Input
Module will accept two Call Stations, SM30
will accept up to 6 Call Stations in total.
Electret condenser microphone
The high quality phantom powered
microphone with built-in bass rolloff filter
(fig.6.1L) gives clear voice reproduction,
even in difficult acoustic environments.
Built-in Compressor
Helps to keep the audio output level of the
Call Station constant, even in situations
where the operator’s speech volume level
changes radically. The amount of compres-
sion is dependent on the Microphone pre-
amplifier gain setting: the higher the gain
setting, the greater the amount of compres-
sion, and therefore the greater the effect on
the microphone signal (see paragraph 6.3).
Balanced Line Level output
Allows Call Stations to be located up to
1000 metres from the Control Centre.
6.1 Operating controls
Numeric Keypad (fig.6.1J)
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. (See chapter 14 for
programming details).
Redial function (fig.6.1I)
Repeats the last zone selection.
Zone Selection Indicator (fig.6.1B)
Each zone has its own LED which is
illuminated when the zone is selected. When
the call is completed the LEDs will be
extinguished.
Function Keys (fig.6.1K)
The 4 function keys are to be programmed
with priority; alarm and attention tones;
pre-recorded messages; routing to loudspeak-
er zones; and Control Relay activation. The
alternative functions of these keys include:
music volume up/down; music source
selection; music mute; and independent
Control Relay switching or toggling (see
chapter 14 for programming details). Using
the Function Keys to make a call is done in
the same way as using the Keypad. 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.
Each Function Key may be programmed to
carry out a totally different task.
Key F1 can be programmed to route a low
priority call, preceded by an attention tone,
to several, frequently used, loudspeaker
zones.
Key F2 could be programmed to route an
alarm tone, followed by a pre-recorded
evacuation message, to all loudspeaker zones
(an “ALL CALL”).
Key F3 could be used to mute the music
signal.
Key F4 could be used to toggle a Control
Relay on and off, switching a warning lamp,
illuminated notice, etc..
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GB/SM 30 user manual 5/26/98 10:18 AM Page 18