HP 8753D - Page 409

TTL
Out Menu
The
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TTL
OUT softkey
provides
access
to
the
TTL
out
menu.
This
menu
allows
you
to choose
between
the following
output parameters
of the
TTL output
signal:
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TTL
OUT
HIGH
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TTL OUT
LOW
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END
SWEEP
HIGH
PULSE
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END
SWEEP
LOW
PULSE
The TTL
output
signals
are
sent
to
the
sequencing
BNC
rear
panel
output.
Sequencing
Special
Functions
Menu
This
menu
is
accessed
by
pressing
the
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SPECIAL
FUNCTIONS
softkey
in
the
Sequencing
menu.
Sequence
Decision
Making
Menu
This
menu
is
accessed
by
pressing
the
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DECISION
MAKING
softkey
in
the
Sequencing
Special
Functions menu.
Decision
making
functions are
explained in
more
detail
below
.
These
functions
check
a
condition
and
jump to
a specied
sequence
if
the
condition
is
true
.
The
sequence
called
must
be
in
memory
.
A sequence
call
is
a
one-way
jump
.
A
sequence
can
jump
to
itself,
or
to
any
of
the
other
ve
sequences
currently
in
memory
.
Use
of
these
features
is
explained
under
the
specic
softkey
descriptions
.
Decision
Making
Functions
Decision
making
functions
jump
to
a
softkey
location,
not
to
a
specic
sequence
title
Limit
test,
loop
counter
,
and
do
sequence
commands
jump
to
any
sequence
residing in
the
specied
sequence
position
(1
through
6). These
commands do
not jump
to
a
specic
sequence
title
.
Whatever
sequence
is
in the
selected softkey
position will
run when
these
commands
are
executed.
Having
a
sequence
jump to
itself
A decision making command can jump to the sequence it
is in. When this occurs
, the sequence
starts over and all commands in the sequence are repeated. This
is used a great deal in
conjunction with loop counter commands
. See the loop counter description
below.
TTL input decision making
TTL input from a peripheral connected to the parallel port (in the GPIO mode) can be used in a
decision making function. Refer to \The GPIO Mode
" earlier in this section.
Limit test decision making
A sequence can jump to another sequence or start over depending on the result of a limit
test. When entered into a sequence,the
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IF LIMIT TEST PASS and
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IF LIMIT TEST FAIL
commands require you to enter the destination sequence.
6-142 Application and Operation Concepts