Bosch Security Systems | 2003-09 | 3922 988 25012en
Plena BGM/Paging System | Installation and Operating Manual | en | 13
4.2 Priority/VOX activated microphone
Figure 4.2
Microphone 1 has different operating modes:
Priority mode:
Connect the microphone to the DIN-socket at the rear of the unit and enable the priority mode with configuration
switch 1 (set to ON-position). This requires a microphone with a priority switch on contacts 4 and 5 of the 5-pin
DIN-connector, such as the table-top microphone LBB 1950. In this mode, microphone 1 will have priority over
microphones 2 and 3 and the background music. Activating this microphone will mute the other microphones and
the music and will also override zone switching and zone attenuation. Priority announcements will even be heard in
deselected zones. This mode is normally used for important (emergency) announcements. You can select a chime
signal to precede such a priority call with configuration switch 3, a speech filter with configuration switch 4 and
phantom power with configuration switch 5.
VOX mode:
Connect the microphone to the phone jack socket at the front of the unit and enable the VOX mode with
configuration switch 2 (set to ON-position). This mode will attenuate the background music or microphones 2 and 3
to a preset ducking level as long as you speak into the microphone. It is normally used with handheld microphones
like the LBC 2900/15 for making casual announcements, temporarily surpressing the music. Background music and
announcements will be heard in the selected zones. The front connection for microphone 1 does not have phantom
power for electret or condenser microphones, so a dynamic microphone must be used. A chime is not available in
this mode, but you can select the speech filter via configuration switch 4.
When no priority or VOX mode has been selected, microphone 1 will just mix with the background music or the
other microphones to the selected zones.
External settings and connections
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180 5-pole DIN
180 3-pole XLR
GND
GND
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