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Document Conventions
2.0 Document Conventions
2.1 Circuits and Zones
The term circuits refers to an actual electrical interface, initiating (detection), NAC (signal), or
relay.
The term zone is a logical concept for a fire alarm protected area, and will consist of at least
one circuit.
Often the terms zone and circuit are used interchangeably, but in this manual the term circuit
is used.
On the FX-2000, circuits can be hardwired inputs and outputs or addressable inputs and
outputs. Both hardwired inputs and outputs, and addressable inputs and outputs may be
grouped together to form logical zones.
2.2 Wiring Styles
Initiating circuits are configured by default as Class B (Style B). They may be globally (all or
none) configured as Class A (Style D) as described in the system configurator. This operation
uses odd and even pairs of two-wire Class B (Style B) circuits to make one four-wire Class A
(Style D) circuit, thus cutting in half the number of available initiating circuits.
Notification Appliance Circuits (NAC) circuits (also known as NAC circuits) may be
individually wired as Class A (Style Z) or Class B (Style Y) without affecting the number of
circuits available.
Addressable Loops may be configured system wide as Class B (Style 4) or Class A (Style 6).
With the addition of isolators, a Class A (Style 6) will become a Class A (Style 7).
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