HP 54501A - The Pattern Trigger Mode

The
Pattern
Trigger
Mode
This
description
of
the
Pattern
Trigger
Mode
is
also
related to
the
front
panel
keys.
There
are
additional
parameters
in
this
mode
that
are
not
used
in
the
Edge
Trigger
Mode and
one
parameter
that
is
carried
over
from
the
edge
mode.
The
one
parameter
that
carriers
over
is
LEVEL.
If
the
level
command
is
used
in
this
mode
it
will
also
change
the level
value
for
that
source
in the
Edge Trigger
Mode.
The
logic
pattern
for
the
Pattern
Trigger
Mode
is
set
using
the PATH
and
LOGIC
commands.
The
PATH
command
specifies
which
of
the
four
inputs
is
selected
for
the
logic
pattern.
Once
the
path
has
been
selected,
the
pattern can
be
set
using
the LOGIC
command.
The LOGIC
command
uses
the
arguments
HIGH,
LOW,
and
DONTCARE
to
set
the
"trigger
on"
bit
pattern.
The
next
command
sets
the "when"
field
on
the
front
panel.
This
is
set
with
the CONDITION
command.
This
command
is
used
in
several
of
the
trigger
modes,
therefore
it
has
parameters
that
are
not
valid
in
this
mode.
The
valid
parameters
for
the
CONDITION
command
in the
Pattern
Trigger
Mode
are:
ENTER,
EXIT,
GT,
LT,
and
RANGE.
When
the
command
TRIGGER:CONDITION
ENTER
or
TRIGGER:CONDITION
EXIT
is
sent
the
Entered
or
Exited
parameter
is
set
on
the front
panel.
When the GT
or
LT
option
is
used
a
time
value
must
be
sent to
define the
limit. When
the
RANGE
option
is
used
two
time
values must
be
sent
to
define
the
lower and
upper
limit.
The
correct
syntax
for
the
RANGE
option
is
TRIGGER:CONDITION
RANGE,
<
range_low
>,
<
range_high
>.
Also,
in
the
Pattern
Trigger
Mode,
you can
set
the
holdoff
time
using
the
TRIGGER:HOLDOFF
command.
Trigger Subsystem
16-4
HP
54501A
Programming