User guide
Installation
DCM-1 User Manual v1.0 27
Visual indication that paging is taking place is given by the
Paging Access LEDs on the front panel. The LED(s) illuminate
to conrm the Zones being paged.
Music Mute
External muting of music is available at the MUSIC MUTE
connector. National or Local Authority regulations governing
such systems may require that normal programme material
(i.e., music) should be muted in an emergency, to ensure that
any emergency messages are clearly audible.
The Music Mute input is on a 2-pin Phoenix-type connector.
It should be connected to the appropriate alarm output on
whichever building management system registers the alarm
(typically the Fire System). The alarm output must be volt-
free; if no such output is available, an intermediate relay or
other isolation device must be installed between the alarm
output and the Music Mute input.
The Mute input can be programmed to operate on either
normally open (NO) or normally closed (NC) contacts via
the menu system (see page 42). The factory default setting is
NO, thus requiring a short-circuit to be applied across the
two pins of the connector for muting to occur.
Visual indication of muting being activated is given by the
Music Mute LED on the front panel.
If the audio system itself is to be used to provide voice alarm
and/or evacuation messages, the DCM-1 can be programmed
to not mute one particular input when Music Mute is made
active. This input can be permanently connected to a sound
store or emergency evacuation microphone, so that when
activated, all inputs will be muted except the emergency
source. If this facility is being used, care should be taken to
ensure the emergency source is not made available to any
zones in normal operation.