HP 54501A - Pre

*PRE
*PRE
(Parallel
Poll
Register
Enable)
command/query
The
*PRE
command
sets
the
parallel
poll register
enable bits.
The
Paralled
Poll
Enable
Register
contains
a
mask
value for
the
bits
to be
enabled that
can
produce an
"ist"
during
a
parallel
poll.
The
*PRE
query
returns
the
current
value.
Command
Syntax:
*PRE
<mask>
Where:
<mask>
::=
0
to
255
Example:
OUTPUT
707;"*PRE16"
Note
This
example
will
allow
the
HP
54501A
to
generate
an
"ist"
when
a
message
is
available
in the
output
queue.
When
a
message
is
available,
the
MAVbit
in
the
Status
Byte
Register
will
be
high.
Query
Syntax:
*PRE?
Returned
Format:
<
mask_vaiue
> <
ML
>
Where:
<
mask_value
>
::
=
sum
of
all bits
that
are
set
•
0
through
255
(integer
-
NR1
format).
Example:
OUTPUT
707;"*PRE?"
ENTER
707;Vl$
Print
Vl$
Common Commands
5-14
HP
54501A
Programming