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29
External Sensing & Multi-Unit Installations
Appendix A
E
L
P
M
A
S
O
T
H
S
U
P
SAMPLE
1
2
3
5
4
6
7
9
10
TB1
8
1
3
2
4
5
6
7
8
9
10
TB2
MUSIC
LINE INPUTS
Vc
LINE
PAGE
SENSE
TRIG
EXT
RELAY
CNTRL
EXT
SPARE
OUTPUT
AMP
FROM
TO
SPEAKER
PUSHBUTTON SWITCH
MOMENTARY SPST
MASTER UNIT
R
P E
UP
D
C
3
A
1
OPTIONS
2
B
O
PTION
switch D enables the external sense input and prevents both periodic sensing and silence-
based sensing. When O
PTION
switch D is UP, sensing only occurs when TB2-3 is held low
(grounded). The unit remains in sense mode for as long as TB2-3 is grounded and you must
ground the external sense line for a minimum of one second.
You use this feature when it is inappropriate to interrupt the program material based on either time
or silence. Of course, you must have some other means of telling the 572 when to sense (electronic
wizardry, slave labor, etc.).
O
PTION
switch D has one additional use: forcing multiple 572s to sample simultaneously. There are
two reasons for doing this:
1.
Adjacent sound systems to the controlled area are noise sources as far as the 572 is
concerned. Their acoustical output influences the ambient sampling of other units.
Simultaneous sampling removes adjacent systems from consideration as noise sources.
2.
During sampling, the sampling speakers are connected to an extremely high-gain amplifier.
Adjacent speaker wiring, in the same conduit or raceway, may cause crosstalk into the speaker
wiring connected to the sampling speakers, which will cause erroneous results in the
controlled zone.
Figure Appendix A-1 shows what is necessary for externally controlled sampling. Figure Appendix
A-2 shows how to interconnect multiple 572s for simultaneous sampling.
Figure Appendix A-1. Using option switch D and a remote momentary
pushbutton for externally controlled sampling.
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