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Appendix L
NOTE: When zone coding is selected as the
Stage 1 audible output, Stage 2 always has
priority over the Stage 1 coding. Once the
coded circuit is driven into Stage 2 by logic,
all zone codes will stop for that circuit no
matter what the minimum rounds are.
Two Stage System Flags
There are two system flags associated with
Two Stage alarm: Reset Inhibit and Two
Stage Audible State. Both of these flags
are writable with user-designed logic. Refer
to the following table for Setting the Two
Stage System Flags.
It is important to note that other Two Stage
writable flags used in the previous Two Stage
implementation are not used in the new Two
Stage implementation.
L-4
• When a coded audible appears on the
output list of more than one Two Stage
control function and there is a conflict
(that is, some functions indicate Stage
1 and some functions indicate Stage
2), then Stage 2 has priority over
Stage 1. As a result, the coded
audibles in question will output Stage 2
(either 120 SPM, steady, or temporal,
as selected).
S
E
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Keyswitch Devices
There are two keyswitch types available in
the MXL-IQ. All logic associated with a
keyswitch device is CSG-M programmable.
The only MXL-IQ defined aspects of a
keyswitch are as follows:
Keyswitch Type 1
1. If a Type 1 keyswitch is activated, an
2. The event will be recorded on the alarm
3. This is true even if there are no previous
Keyswitch Type 2
1. If a Type 2 keyswitch is activated when
2. If an alarm is detected while this trouble
3. If the keyswitch is activated when an
E
S
Y
S
T
E
M
F
L
A
G
S
e
n
h t
e
N
r o
m
l a
R
e
s
t e
All other system behavior is determined by
R (
e
d
M
M
B
k
e
y
i )
: s
output logic design.
n I
h
i b i
e t
d
N
t o
n I
h
i b i
e t
d
b i
t i
s i
F
A
L
S
E
f i
h t
e
Sample Two Stage Systems
t e
n I
h
b i
. t i
e
n
h t
e
N
r o
m
l a
A
u
d
b i
e l
Using Reset Inhibit with Timer
n
c
e
R (
e
d
M
K
B
k
e
y
i )
: s
The figure on page L-5 shows methods of
n I
h
i b i
e t
d
implementing Reset Inhibit with a timer,
N
t o
n I
h
i b i
e t
d
creating an ANY KEYSWITCH function/flag
g
e
A
u
d
b i
e l
S
a t
e t
s i
and a timer based signal silence inhibit
q
i u
e r
a
T
w
o
S
a t
g
e
function.
Keep in mind that your implementation of
these features may vary from the examples
shown. If Reset Inhibit or Two Stage
Audible Silence are not required in your
system, then references to these flags are
not required in the logic design.
alarm event will result.
queue and all standard MXL-IQ functions
associated with an alarm will occur (that
is, the ANY ALARM flag will be set to
TRUE, the ANY NEW ALARM flag will
pulse, etc.).
alarms.
no alarms are present in the system, it
will result in a trouble condition at the
MXL-IQ.
condition is present on the trouble
queue, the active Type 2 keyswitch will
be added to the system as an alarm
event (added to alarm queue).
alarm is present in the system, the
keyswitch will be treated as an alarm.
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