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Operation
Figure 4 6
Data
entry keys
A
G
H
7
8
9
E
CJ
F
O
4
(_)
5
O
6
O
C
O
D
O
o
2
3
A
V
B
o
0
o
CANCEL
ENTER
o
/
The
maximum
valid
column number
with a
single unit
is
72.
If
several
mainframes
are
connected and
programmed
for
master/slave operation, the
maximum
column
can be up
to
360
(with
five units).
When
a
valid
crosspoint address
{row and column)
is
in
the
alphanumeric
display,
pressing
the
OPEN
key
turns off the
crosspoint display
LED.
(The
message
INVALID INPUT
is
displayed
for
addresses out
of
range.)
If
the
AUTOMATIC
(COPY DISPLAY
RELAYS)
indicator
is
lit,
the corre-
sponding
relay
opens
immediately.
The
CLOSE
key
per-
forms
the
same
action as the
OPEN
key
except
that
it
turns
on
crosspoint display
LEDs
and
relays.
Pressing
the
CLEAR
key
turns off
all
crosspoint display
LEDs.
If
the
AUTOMATIC
(COPY DISPLAY
RELAYS)
indicator
is
lit,
all
relays are
opened
immediately.
The
CROSSPOINT DISPLAY MODIFIED
indicator
lights
and
the
MEMORY
or
RELAYS
indicator
go
out
when
changes
are
made
to
the
crosspoint
display,
making
it
differ-
ent
from
the
configuration
of
its
source.
It
also
lights
when
opening an
already
open
crosspoint
and
closing
an
already
closed
crosspoint.
The
SCROLL
keys
are not
active
when
the
CROSSPOINT
DISPLAY
MODIFIED
indicator
is
lit.
The
optional
light
pen can
also
be used
to turn
on and
off
crosspoint
LEDs.
Just
hold
it
perpendicular
to
the front
panel
overlay
at
the desired
LED
and
press the button
on
its
barrel.
This
action toggles the
state
of
the
LED.
The
maximum
number
of simultaneously
closed
cross-
points
depends on
the specified drive current per crosspoint
of each
card.
The
total
relay drive
current required per
main-
frame cannot exceed
48. 5
A,
since the
6V/50A
power
supply
also
provides
1.5
A
for the front
panel
display.
4.7
Copying
crosspoint
display
The
setup data displayed
on
the crosspoint
LEDs
can be
stored
in
non-volatile
memory
of
the
Model 707
A
or
can be
sent directly
to
the
relays
by
pressing
either
the
COPY
DIS-
PLAY
MEMORY
or the
COPY
DISPLAY
RELAYS
key,
seen
previously
in
Figure
4-5.
With
the
COPY
DISPLAY
->
MEMORY
key, the
displayed
crosspoint configuration
is
stored
at the
setup location
shown
in
MEMORY
STEP
field.
It
overwrites
the
present setup data
at
that location.
If
a
valid location
is
keyed
in
first,
pressing
this
key
stores
the crosspoint configuration
at
that
setup
and
sets
the
MEMORY
STEP
field
to
that location.
If
the
CROSSPOINT
DISPLAY MODIFIED
indicator
is
lit,
it
goes out and
the
MEMORY
LED
lights.
The
INVALID
INPUT
message
is
displayed
briefly
if
you
try to
copy
to
a
setup
location
below one
or
above
100.
In
master/slave
configurations,
each
unit stores
its
own
por-
tion
of each
stored
setup.
When
the
COPY
DISPLAY
^
RELAYS
key
is
pressed, the
displayed crosspoint
configuration
is
sent
to
the
relays:
•
If
the
MEMORY
indicator
is
lit
(i.e.,
the
crosspoint
dis-
play
shows
an unmodified
setup
from memory),
the
RELAY
STEP
field
is
set to
the
MEMORY
STEP
field.
In
effect, this
copies a setup
from
memory
to the relays.
•
If
the
RELAY
S
indicator
is
lit,
the
RELAY
STEP
field
is
not
affected, as
it
reflects
the
last
stored setup sent
to
the
relays.
•
If
CROSSPOINT
DISPLAY MODIFIED
is
lit, it
goes
out and
the
RELAYS LED
lights.
4-11
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