Installation guide

VAR4 / VAR12 / VAR20 - Product Description
4.4 Audio Monitor Mode
The output to any loudspeaker circuit, or any VAR Router audio input or DVA message can be audibly
monitored via the front panel loudspeaker and its audio level displayed on the LCD screen.
To achieve monitoring of amplifier outputs, an audio monitor bus ‘daisy-chains’ around the amplifier modules
within the system using pins within the same connectors as the Audio-CAN bus to simplify system wiring.
Within the VAR Router this bus can be routed to an audio amplifier and speaker for audible monitoring and
via the DSP for level display.
The audio monitoring bus signal relates to the zone output and is fed from the standby amplifier in the event
of failure of the main amplifier. Audio monitoring of any standby amplifier always provides a signal relating to
its own output.
The amplifier currently being monitored is displayed on the LCD and the VAR Router causes its associated
‘select’ LED to be illuminated.
The bargraph display is dB relative to 100V for the amplifier outputs and dB relative to digital full scale for
VAR Router inputs.
The unit reverts back to Fault Monitor Mode, either by manual selection or if any new faults occur or after a
5-minute time out. Entering the audio monitor mode affects only the LCD display of the unit, i.e. all fault-
monitoring activities continue to take place in the background. The status of the LEDs and external outputs
are unaffected.
The monitored audio level is adjustable by the rotary encoder. Note that this volume control affects only the
monitor audio level and not the level of the alarm sounder which shares the same amplifier and speaker.
4.5 Software Versions
The VAR Router determines and displays its own software version(s) and that of all connected amplifier
mainframes and associated surveillance cards.
Issue: 03 complete, approved
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