The Pattern Trigger Mode - HP 54501A Programming Reference Manual

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