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Operation
4.1
1
.2
Front panel
triggering
To
trigger the
Mtxlel
707A
from
the front panel,
simply
press
the
MANUAL
key.
(Press
and
hold
for auto-repeat.
)
If
trig-
gers are enabled,
this
key
is
always
operational regardless
of
the selected trigger
source
(unless the unit
is
placed
in
remote
over
the
IEEE-488
bus,
in
which
case
all
front
panel
keys except
LOCAL
are
locked
out).
Thus,
front
panel
trig-
ger source
selection
(TRIG
ON
KEY)
provides
a
means
to
lock out
all
other trigger
sources
when
only
front
panel
trig-
gering
is
desired.
Triggering
will
stop
when
the
RELAY
STEP
field
incre-
ments
to
100.
If
you
press
MANUAL
and
the
unit
is
not
ready,
an
error
message
will
be
displayed,
as
discussed
in
the
following paragraph.
4.1
1
.3
Trigger
overrun
conditions
Once
the
instrument
is
triggered,
it
begins
transferring relay
setup data
from mainframe
memory
to
the
matrix
cards.
If
a
second
trigger
is
received while the
unit
is still
transferring
data,
a
trigger
overrun condition
will occur. In
this
case, the
second
trigger
is
not
processed
and
the
unit will
display
the
following
error
message:
TRIG
OVERRUN
After
the
time required
for transferring relay
data has
elapsed, the
Model 707
A
is
able to process another
trigger. If
a
trigger
is
received before
the
programmed
settling
time has
elapsed,
the
following
message
is
displayed;
NOT
SETTLED
Figure 4-16
shows
an
example
setup
change and
a timing
diagram
of
the
READY
(for trigger)
pulse
and
a
high
true
MATRIX READY
pulse
when
the
Model
707
A
is
processing
the
trigger.
(The
status
of
these signals
is
available
in
the
serial
poll byte,
see
Section
5.)
This timing
is
for
setups with
no make/break
or
break/make
rows.
When
either
make/break
or
break/make
operation
is
selected, but
not both, the
Model 707
A
switches through an
intermediate setup
to
ensure proper
relay operation.
If
only
make/break rows
are selected, the
Model
707
A
takes these
steps;
1.
Closes
crosspoints
in
make/break rows
yielding
an
intermediate
setup.
2.
Opens
crosspoints
in
make/break rows and
opens/closes
crosspoints
in
"don't
care"
rows
yielding the desired
setup.
If
only
break/make rows
are selected, the
Model
707A
takes
the.se
steps;
1
.
Opens
crosspoints
in
break/make rows
yielding an
inter-
mediate
.setup.
2.
Closes
crosspoints
in
break/make rows and
opens/closes
crosspoints
in
"don't care"
rows
yielding
the
desired
setup.
An
example
of
these operations
is
shown
in
Figure
4-
1
7 with
its
corresponding timing diagram.
By
comparing
Figures
4-16 and
4-17,
you can
see
that
the intermediate setup
needed
for
make/break
or break/niake
causes a delay
in
the
assertion
of
READY
and
MATRIX
READY
equal
to
the
relay
settling
time.
When
a
combination of make/break
and break/make rows
are
selected, the
Model
707A
must
switch through
three
intermediate setups
to
ensure proper relay
operation.
The
steps
taken
by
the unit are
as
follows:
1.
Opens
crosspoints
in
break/make rows
yielding
the
first
intermediate
setup.
2.
Closes
crosspoints
in
raake/break
rows
yielding
the sec-
ond
intermediate
setup.
3.
Opens
crosspoints
in
make/break rows
yielding the
third
intermediate
setup.
4.
Closes
crosspoints
in
break/make rows and
opens/closes
crosspoints
in
"don't care"
rows
yielding
the
desired
setup.
Figure 4-18
shows
an
example
setup
change
with
the
neces-
sary intermediate
setups.
As
the
timing
diagram
shows,
three
additional relay
settling
time
intervals are
needed
for the
intermediate
setups.
4-21
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