Installation guide

VAR4 / VAR12 / VAR20 - Product Description
3.7.3.1.2 Non-Latching Mode
Any contact may be configured to trigger a so-called non-latching Latent Route.
When the contact is made, a pre-programmed route is set up. When the contact is released, the route is
cleared, no separate ‘reset’ input is required.
Application examples are (1) when simple paging is required (not using ASL microphones) or (2) when
background music needs to be routed to selectable areas.
It is possible to use the Latent Route mechanism to allocate any output to any audio input, Mic/Line, DVA, or
Music.
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It is possible to configure whether or not a particular Latent Route causes busy indications to be
shown on microphone consoles.
For example, a busy indication would not be desired if the Latent Route mechanism was to be
used for enabling a background music source.
If a Latent Route is used to trigger a DVA, the trigger is configurable for two modes as for a latching route:
• DVA Full
In the ‘DVA Full’ mode, when the trigger is de-asserted, the DVA(s) completes its full message cycle
before ending.
• DVA Part
In the ‘DVA Part’ mode, when the trigger is de-asserted, the DVA(s) ends immediately even if part way
through a DVA message broadcast.
When a Latent Route is made and the routes set up, any further routes added via the VAR Router user-
interface are automatically added to the existing routes. Similarly routes may be removed via the user
interface ‘on-the-fly’. That is to say: it is not necessary to de-assert and then re-assert the Latent Route in
order to recognise changes in the Latent Route set up.
Although two music inputs, A+B, are provided, they are switched in the analogue domain before digitisation.
Therefore only one may be routed at a time. The application example is where a background music source is
required but may be chosen from CD player or radio Tuner.
Music may be routed via the Latent Route mechanism, any other contact may be assigned as switch to
select either A or B. this is useful for selecting between two alternative music sources, i.e. Tuner or CD
player.
3.7.3.2 External Faults
Any contact may be configured as an external fault input.
It is possible to assign an 18 character alphanumerical description to a contact input when it is configured as
an external fault input.
This is to enable external equipment which provide normally closed relay contacts to indicate healthy status,
to be integrated into the VAR Router fault monitoring system. A typical example in a VA system is the battery
charger.
An active low contact closure on the port indicates a ‘no fault’ condition. Open circuit on the port will cause a
fault to be reported and logged. The specific fault that is raised will be identified by the alphanumerical
description.
3.7.3.3 Remote Fault Accept
The VAR Router provides outputs to drive a remote Fault Panel (see Section “Remote Fault ”); typically this
consists of a drive to a sounder, and fault LED. Any contact may be configured as the ‘Accept’ for the remote
Fault Panel; this acts as a local ‘fault accept’ button affecting only the remote indication.
Issue: 03 complete, approved
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