1-3
A Virtual NAC (or VNAC) is a collection of TrueAlert appliances grouped
together to allow control functions. Each 4100/4020 system can support up to 64
Virtual NACs (8 default VNACs plus 56 user-defined VNACs). A VNAC can be
made up of TrueAlert appliances from any or all of the TrueAlert Controller
channels. (A VNAC may cross channel or controller boundaries.)
The 4100/4020 supports custom labels for VNACs, and treats VNACs as
notification appliance circuits that can be controlled as system points. An
example of this might be a high rise, where every floor wires a single A/V unit
in the stairwell. All of the stairwell A/Vs could belong to a single VNAC,
although they are distributed across many TrueAlert channels.
Figure 1-1 shows a graphical representation of VNACs. Any appliance may be
assigned to up to three groups (in addition to its default group). A TrueAlert
Addressable Controller can then control the appliances via VNAC addressing.
This means that it can tell all the appliances in a VNAC to turn on or off with a
single command that is VNAC-addressed. An appliance maintains internal status
for each of its VNACs. With the exception of the default VNACs, the appliance
will be on whenever any of its members are on.
Figure 1-1. Graphical Representation of Virtual NACs
Continued on next page
Version 9.X System Description,
Continued
Virtual NACs
FACP
TrueAlert
Slave
Card
Group 5
Channel 1
Channel 3
Group 6
Group 6 Group 7Group 5
Virtual NAC 6
VNAC 1
(Default – All Appliance Outputs)
RUI Communications
VNAC 12
VNAC 14
VNAC 13
VNAC 9 VNAC 10
VNAC 11
To/From
4100/4020
FACP
TrueAlert
Addressable
Controller
Channel 2
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