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1
J
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i
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]
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6
,
sl5
to S18
(keys
5
to
8
)
are
switches not provided
with VP-7721A.
By addition of
these
switches,
the
number
of preset addresses can be expanded from 16
(A-l
to D-4)
to
32
(A-l to D—8).
g)
Switching condition
Switching conditions applied to Si
to S12
in Pig.
4-18 are
shown
in
Fig.
4-19.
Normal
state
A switch
The
switch
is
is
pressed.
released.
First
operation
The
switch
The switch
is
is
pressed._released.
Succeeding
operation
Fig.
4-19
Switching conditions
"LOW"
is the
state
that the point is connected to the common
point
(
)
through a resistor of
500 ohms or less,
or the
voltage of
the point against the common point
is 0.5 volts or
less.
o
(V
4-37
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