Installation guide

VAR4 / VAR12 / VAR20 - Product Description
2.2 Communication with the ASL Amplifier System
The diagram in Figure 2 shows the VAR Router connected to the ASL Amplifier System. The VAR Router
communicates with each Amplifier Mainframe processor via a CAN serial data network.
Up to 63 Mainframes can be connected. Each Amplifier Mainframe processor communicates with the
Surveillance Interface Cards, associated with each of the internal amplifier modules, via a separate intra-
frame interface. The VAR Router is therefore able to communicate with each Amplifier Surveillance Interface
Card for configuration and fault reporting purposes. Each mainframe has four ‘slots’ for amplifier modules. A
100 W module occupies one ‘slot’, a 200 W amplifier 2 ‘slots’ and a 400 W amplifier 4 ‘slots’. An example of
each is shown in the diagram.
Additionally the VAR Router can command any amplifier interface to connect the amplifier output to an audio
monitor bus thus making it available for audio monitoring at the VAR Router loudspeaker. The audio monitor
bus daisy chains between amplifiers along with the CAN bus. This interface is called Audio-CAN.
Figure 4 VAR Router and Amplifier Mainframes
MAINFRAME
PROCESSOR
SYSTEM
SURVEILLANCE
INTERFACE
AMP
SURVEILLANCE
INTERFACE
AMP
SURVEILLANCE
INTERFACE
AMP
SURVEILLANCE
INTERFACE
AMP
SLOT-1 SLOT-2 SLOT-3 SLOT-4
MAINFRAME
PROCESSOR
SYSTEM
SURVEILLANCE
INTERFACE
AMP
SLOT-3
100W 100W 100W 100W
400W
ID: 01
AMPLIFIER MAINFRAME #01
AMPLIFIER MAINFRAME #02
AMPLIFIER MAINFRAME #63
ID: 63
MAINFRAME
PROCESSOR
SYSTEM
SURVEILLANCE
INTERFACE
AMP
SURVEILLANCE
INTERFACE
AMP
SLOT-1 SLOT-3
200W 200W
ID: 02
VAR
PROCESSOR
SYSTEM
VAR AUDIO ROUTER AND SYSTEM CONTROLLER
FAULT DISPLAY AND COMMISIONING
FUNCTION
AUDIO MONITOR FUNCTION
CAN BUS
AUDIO BUS
Issue: 03 complete, approved
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