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.
1The 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.
2The 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.
3When 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.
4If 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.
5The processor checks which attention tone has been programmed to precede an announcement originating from the Call Station, then it switches on the
6If 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.
7The 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.
8When 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.
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