Filter
Top Products
Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | EN54-16: 2008 en | 43
Clause / Requirement Compliance Signature
12 Emergency microphone(s) (option with requirements)
The VACIE may have provision for emergency
microphone(s). In this case the emergency microphone(s)
shall have
The Praesideo system offers two types of emergency
microphones with microphone supervision:
• a call station can be configured to be of class
‘emergency’ which makes the microphone of the
call station an emergency microphone;
• if an audio input of the system is configured to the
auxiliary microphone function, a connected
microphone can act as emergency microphone.
a priority over all inputs, including pre-recorded
messages,
The priority can be configured of a call stations’ ‘PTT’ key or
audio input that is activated from a control input defined in
a call macro. The emergency microphones must be
configured to have priorities in the range 224 to 255
(highest). Higher priorities overrule lower priorities in case
of resource or destination conflicts. Calls with the same
priority operate on first come first serve basis, except in the
case of priority 255: calls with the same priority 255
overrule each other, so the latest becomes active. This
assures that high priority microphones that are left behind
in an active state will never block the system.
Calls may contain pre-recorded messages. The
prerecorded messages then adopt the priority of that call.
b an emergency microphone control to open the
microphone channel, at access level 2,
If the microphone of a call station is used as emergency
microphone, the microphone channel can be opened via:
• the ‘PTT’ key of the call station
• a call station keypad key or call station kit input
contact
If a microphone connected to an audio input is used as
emergency microphone, the microphone channel can be
opened via:
• a control input contact
• a call station keypad key
The actual way of operation is defined in the system and is
subject to configuration.
c where a pre-announcement attention drawing signal is
provided, an indicator adjacent to the microphone shall
show when the signal has finished and live speech can
commence, and
A call station has a call status LED. This LED is blinking
green when a pre-announcement attention signal or pre-
recorded message is playing. The LED is steady green
when the live speech can commence. Pre-announcement
signals are also audible from the call stations’ monitor
loudspeaker, to alert the experienced user about the
progress.
For an emergency microphone connected to an audio
input, under control of a control input contact, no such
indicator exists; therefore such emergency microphones
should only be configured for calls that do not have pre-
announcement signals or messages.
The user interface of the Praesideo PC call station shows
the call progress in a progress bar on the screen with clear
indication when the speech can commence.
d when the emergency microphone control is operated,
any audible indication that might interfere with the use
of the microphone shall be automatically muted.
The monitor speaker of the call station is muted during the
live speech phase. Other sources of interference should be
minimized by proper installation, e.g. keep HVAC
equipment and loudspeakers at a distance from the
microphone.
The installer must use the priority mechanism of Praesideo
for switching off non-relevant loudspeakers, either directly,
if the loudspeakers are connected to the Praesideo system,
or indirectly via control output contacts that interrupt an
external system or audio path. Other audible indications,
like audible fault warning or voice alarm indications, must
be muted by configuring an output contact that is wired in
series with the audible indications. .
If it is not possible to avoid interference from closely
mounted loudspeakers receiving the call, the call stacking
function of Praesideo allows for recording a call with
delayed playback after the spoken announcement has
finished.