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Bosch Security Systems | 2003-09 | 3922 988 92883en
Plena Mixer Amplifier | Installation and Operating Manual | en | 14
Microphone 1 input has a 5-pole DIN (for a 3 or 5-pole DIN microphone) and a 6.3-mm phone jack connector
wired in parallel. Only when connecting a microphone with a priority contact on pin 4 and 5 of the 5-pole DIN
connector (2), this input has priority over all inputs except the emergency input. This microphone input can be
included with a voice controlled circuit (VOX) which will overrule all the other input signals. How to activate the
VOX is described in §2.1.
4.3 Chime ON/OFF-switch
Figure 4.3
Depending on the position of the chime ON/OFF-switch (1), switching on microphone 1 will activate the chime.
The default chime volume is -8 dB (40 V), which will be sufficient in most applications. The volume can be altered
using the potentiometer VR401 on the main PCB of the unit (see §2.3).
Note
Only use one of the two connection possibilities of each microphone input.
Note
Only when connecting a 5-pole DIN microphone to the 5-pole DIN connector of microphone input 1 the
chime can be activated.
External settings and connections
1
1
5
V
/
2
3
0
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DC
In
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y
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1
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1
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7
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8
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1