VAR4 / VAR12 / VAR20 - Operation Manual
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5
VAR Router Configuration
The VAR Router has its own configurable parameters such: as operation mode; name; date / time; over
temperature alarm; alarm sounder; and remote fault outputs. It is also possible to configure some
parameters related to the interaction with a host computer via the RS232 port and host protocol configuration
menus.
5.1
VAR Router Operation Mode
The VAR12 and VAR20 Routers can operate in stand-alone or networked mode. The VAR4 can only operate
in stand-alone mode, and should only be configured for this operation mode.
In networked mode, the VAR12 and VAR20 Routers require a VAR-NIA Network Interface Adapter to
interface to an Intellevac Network. The Intellevac Network is controlled by an Audio Control Unit, such as the
8x8 Intellevac ACU or the VAR8-ACU. Normally three network audio channels are supported to enable
concurrent ALERT, EVACUATE and Fire Microphone audio to be broadcast from the Audio Control Unit.
When this level of concurrency is not required, a fewer number of network channels can be implemented. An
equivalent number of audio channels at the VAR Router would then be available for connection of
microphones or other audio sources.
The following section describes the network topology.
For details on the VAR-NIA, refer to the VAR-NIA Product Manual [
Table 24-8
].
5.1.1
Network Topology
The Intellevac Networks’s 8x8 Audio Control Unit, supports the following Slave Units:
•
Wall mount Intellevac Distributed Amplifier Units, both legacy 4x4 DAUs and 8x8 DAUs.
•
Rack mount VAR12 and VAR20 Routers, using the VAR Network Interface Adapter (VAR-NIA).
•
Rack mount VAR8 Routers fitted with ANIC Network Interface Card.
The Audio Control Unit normally ‘talks’ out of its UPSTREAM port, which is connected to the
DOWNSTREAM port of the first Slave Unit in the chain. The UPSTREAM port of that Slave Unit is then
connected to the DOWNSTREAM port of the following system until a complete ‘ring’ is implemented back to
the Audio Control Unit.
The first Slave Unit is allocated a Slave-ID of 1, the next unit has Slave-ID 2 etc. The Slave-ID corresponds
to the Slave Unit’s physical position in the network.
Figure 4
shows the scheme of an Intellevac Network hosted by an 8x8 Audio Control Unit in which the
different types of Slaves Units are interconnected.
5.1.1.1 System
Parameters
•
Number of Slave Units: up to 30 units (120 network zones)
•
Maximum distance between nodes: 1 km
•
Network Control Response Time (Fire Alarm trigger to DVA initiation): <1 second
5.1.1.2
Main Network Features
•
Slave Units can be any combination of: Intellevac 4x4 DAUs; Intellevac 8x8 DAUs; VAR8 Routers fitted
with an ANIC Network Interface Card; and VAR12/20 Routers using a VAR-NIA interface unit.
•
Slave-IDs must correspond to the Slave Unit’s physical position in the network.
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