40
• All Speakers Minus Switch – When this switch is activated, all speaker circuits not switched to the EVAC
channel and playing the Evacuation tone/message, are switched to the ALERT channel and turned ON. When
this switch is turned ON while an ALERT message is still playing, the active speakers already switched to the
ALERT channel will remain ON. When this switch is placed in the OFF position, the ALERT channel speaker
circuits are switched OFF. The EVAC channel speakers are not affected. The associated green LED is turned
ON when all speakers not playing an evacuation tone/message are switched to the ALERT channel and turned
ON.
SPEAKER SELECT SWITCHES AND LEDs
The Speaker Select Switches are normally used to turn ON individual speaker circuits. The module usually contains
eight three-position switches with sixteen LEDs. Optionally, the module may contain two switches per speaker circuit
and sixteen LEDs. (This optional module is usually found on Triple Channel Audio Systems that will be discussed
later in this Section.)
Each three-position switch has two LEDs associated with it to indicate its operation. The momentary UP position of
the switch switches the speaker circuit to the EVAC channel, and turns the speaker ON. The momentary DOWN
position of the switch switches the speaker circuit to the ALERT channel and turns the speaker ON. The CENTER
position of the switch turns the speaker circuit OFF. The associated red LED is ON when the EVAC channel is active;
the green LED is ON when the ALERT channel is active.
If the microphone is being used or a message is being played when a Speaker Select Switch switch is activated, the
message will be heard on the associated speaker circuit. The speaker circuit is routed to Channel 1 when the switch
is turned OFF.
DUAL CHANNEL AUDIO SYSTEM OPERATION
The following operations are for Dual Channel Audio systems.
HOW TO OPERATE THE MICROPHONE DURING AUTOMATIC ALARM CONDITIONS (SEE FIGURE 18)
Y
ou can
silenc
e alarm sig
nals by p
ressing th
e <ALARM SIL
ENCE> ke
y on th
e interface p
anel. Th
is actio
n stops th
e
V
oice T
one Ge
nerator (VTG)
. If the <ALARM SILE
NCE> key is not pr
essed, the Ala
rm Message/
tone will be hear
d
on the Channel 2 speaker circuits which are automatically activated by the alarm.
You can select additional speaker circuits for your message, by turning ON desired Speaker Select Switches. If you
do not select additional speaker circuits, you will only be able to announce your message on the Channel 2 speaker
circuits activated by the alarm.
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