The
Sequencing
Menu
Pressing
the
4
SEQ
5
key accesses
the Sequencing
menu. This
menu
leads
to
a
series
of
menus
that
allow you
to create
and control
sequences
.
Gosub
Sequence
Command
The
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GOSUB SEQUENCE
softkey
,
located
in
the
Sequencing
menu,
activates
a
feature
that
allows
the
sequence
to
branch
oî to
another sequence
,then
return
to
the
original
sequence
.
F
or
example
,
you
could
perform an
ampliîer measurement
in the
following
manner:
1.
Create
sequence
1
for the
speciîc purpose
of performing
the
gain
measurement
and
printing
the results
. This
sequence will
act as
a
sub-routine
.
2. Create
sequence 2
to set
up a
series
of
diîerent
input
power
levels
for
the
ampliîer
gain
measurements.
In-between each
power level
setting, call
sequence
1
as
a
sub-routine
by
pressing
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GOSUB
SEQUENCE
N
N
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NN
SEQUENCE
1
.
Now,
sequence 2
will print
the measurement
results
for
each
input
power
level
applied
to
the
ampliîer
.
TTL
I/O Menu
This menu
can
be
accessed
by
pressing
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TTL I/O
in
the
Sequencing
menu.
TTL
Output
for
Controlling P
eripherals
Eight
TTL
compatible
output
lines
can be
used
for
controlling
equipment
connected
to
the
parallel
port.
By
pressing
4
SEQ
5
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TTL
I/O
you
will
access
the
softkeys
(listed
below)
that
control
the
individual
output
bits.
Refer
to
Figure
6-80
for
output
bus
pin
locations
.
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N
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N
PARALLEL
OUT
ALL
lets
you
input
a
number
(0
to
255) in
base
10
and
outputs
it
to
the
bus
as
binary.
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N
SET
BIT
lets
you
set
a
single
bit (0
-7)
to
high
on
the
output
bus
.
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CLEAR
BIT
lets
you
set
a
single
bit
(0
-
7)
to
low
on
the output
bus.
TTL
Input
Decision
Making
Five TTL
compatible input
lines can
be
used
for
decision
making
in
test
sequencing.
F
or
example,
if a
test îxture
is
connected
to
the
parallel
port
and
has
a
micro
switch
that
needs
to
be activated
in order
to proceed
with a
measurement, you
can
construct
your
test
sequence
so that it checks the TTL state of the input line
corresponding to the switch. Depending on
whether the line is high or low
, you can jump to
another sequence
.T
o access these decision
making functions
,press
4
SEQ
5
NNNNNNN
NNNNNNNNNNNNNNNN
TTL I/O
. Refer to Figure 6-80 for input bus pin locations
.
NN
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NNNNNNNNNN
PARALL IN BIT NUMBER
lets you select the single bit (0 - 4) that the sequence will be
looking for.
NNNNNNNNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNNN
PARALL IN IF BIT H
lets you jump to another sequence if the single input
bit you selected
is in a high state
.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PARALL IN IF BIT L
lets you jump to another sequence if the single input bit you selected
is in a low state.
Pin assignments:
pin 1 is the data strobe
pin 16 selects the printer
6-140 Application and Operation Concepts
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