
Installation
and
Operation
Manual
28
Addressable
Loop
Circuit
Wiring
One
ALU
card
supports
one
addressable
loop
circuit.
Addressable
Loop
Circuit
supports
Class
A
and
Class
B
style.
A
maximum
of
252
devices
can
be
connected
to
the
circuit.
All
the
compatible
detectors
and
manual
stations
are
polarity
insensitive,
while
the
compatible
modules
are
polarity
sensitive.
Refer
to
the
instruction
sheets
packed
with
each
device.
The
detectors
and
modules
may
be
wired
together
according
to
several
NFPA
defined
wiring
styles.
The
wiring
style
that
is
appropriate
for
your
installation
should
be
determined
from
the
relevant
building
codes
and
the
local
Authority
Having
Jurisdiction.
Addressable
Loop
Circuit
Wiring
–
Class
A
Class
A
provides
redundant
communication
paths.
Figure
22
Addressable
Loop
Circuit
Wiring
–
Class
A