Pre - HP 54501A Programming Reference Manual

*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