VAR8 and Variants Operation, Commissioning, Fault Finding, and Maintenance Guide
sue: 02 complete, approved
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Page 91 of 166
18 Ambient Noise Sensor (ANS) Configuration
An Ambient Noise Sensor (ANS), or multiple ANS sensors, may be used to adjust the output gain of any
zone based on a measure of the ambient noise in the target zone. With the ANS sensors acting to reduce
the output gain of the zone from the maximum configured value when the ambient noise in the zone is below
a set maximum threshold value. This is useful to ensure that the broadcast is set to a level above the
ambient noise, and therefore is always loud enough to be clearly audible, yet is as quiet as possible to
minimise noise nuisance, and unnecessary or uncomfortably loud broadcasts when the target zone is quiet.
If a zone is large then up to twelve ANS sensor can be used for any one zone. However in this use it may be
better to split the zone into separate sub-zones, each configured by one or two ANS sensors. Additionally an
ANS can be positioned at the junction of two zones, and can then be used to control the volume of broadcast
in both zones.
Where multiple ANS sensors are assigned to a single Router output, the highest of the received ANS values
is used, i.e. the zone volume is increased to the required level in the worst case area.
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Ambient Noise Sensors are connected to Remote I/O Unit analogue inputs.
18.1 ANS Connection to Remote I/O Unit
To Connect an ANS Sensor to a Remote I/O Unit:
1. Select the Remote I/O Unit to be programmed by selecting its unit address on the RS485 bus.
Menu: ConfigurationÆSystemÆRouterÆCtrlÆRemote
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The unit address should match the address set by a switch internal to the unit.
2. Select the Remote I/O Unit analogue input to which the ANS is connected.
Menu: ConfigurationÆSystemÆRouterÆCtrlÆRemoteÆUnit address <n>ÆAnalogue
3. Select ‘ANS’.
Menu: ConfigurationÆSystemÆRouterÆCtrlÆRemoteÆUnit address <n>ÆAnalogue
ÆAnalogue channel=<nn>
The currently configured option (UNUSED in the example) is displayed in upper-case letters.
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