19
A-
ON C B
A
1
2 3
4 5
6
7
SX2120-SE
Q
Sin
g
le-U
n
it
Sy
stem C
o
n
tro
lled
b
y M
o
men
ta
ry
S
w
itch
es
Locati
on 3
Locati
on 2
Locati
on 1
M
ixer
Signal Process
ing
A
m
p
lifier
U
se an
LED
a
nd
1K, ¼
W
re
si
stor
at
each
lo
cati
on
Pr
og
ra
m:
Up & Dow
n
Inp
u
ts =
On
e M
ome
ntar
y
12V
dc Ou
tpu
t =
LED
Figure 1