Bosch Plena - Connecting the MIC;Line Input with VOX Functionality

Bosch Security Systems | 2004-06 | 9922 141 10371en
Plena Voice Alarm System | Installation and User Instructions | Installation en | 39
4.10.2 Connecting the mic/line input
with VOX functionality
The voice alarm controller has 1 mic/line input with
voice-activated (VOX) functionality (see figure 4.12).
This input has two sockets; one balanced XLR socket
and a balanced 6.3 mm jack socket. The signals from
both sockets are mixed to form a single input signal.
Typically, the mic/line input with VOX functionality is
used to connect an additional emergency microphone
or to interface with another emergency sound system
(e.g. a Praesideo system). Depending on the
configuration (see section 4.6), the mic/line input
automatically starts an emergency call if the input level
> -20 dBr
(100 mV for line and 100 µV for microphone) or if the
VOX switch is closed (see figure 4.13 for connection
details).
figure 4.12: Mic/line input with VOX functionality
LBB1990/00
Voice Alarm Controller
L
R
PC
p
Calibration
Mic/Lin
GND
figure 4.13: Connecting a VOX switch
LBB1990/00
Voice Alarm Controller
123456
VOX Switch
123456
24V
DC out