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HP 8340b - Page 59

HP 8340b
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Enter
Enter
is
the
complement
to
OUTPUT,
and
is
used
to
transfer
data
from
the
addressed
instrument
to
the
controller.
The
syntax
is
ENTER
is
always
used
in
conjunction
with
OUTPUT,
such
as:
100
OUTPUT
719
;
"...
programming
codes
.
.
.
"
110
ENTER719;
"...
complementary
codes
.
.
.
"
ENTER
statements
are
commonly
formatted,
which
requires
the
secondary
command
USING
and
the
appropriate
image
items.
The
most-used
image
items
involve
end-of-line
(EOL)
suppression,
binary
inputs,
and
literal
inputs.
For
example,
100
ENTER
719
USING
"#,
B"
A,
B,
C
suppresses
the
EOL
sequence
(#),
and
indicates
that
variables
A,
B,
and
C
are
to
be
filled
with
binary
(B)
data.
As
another
example,
100
ENTER
719
USING
"#,
123A";
A$
suppresses
EOL,
and
indicates
that
string
variable
A$
is
to
be
filled
with
123
bytes
of
literal
data
(123A).
(Note:
Be
careful
when
using
byte-counting
image
specifiers,
because
if
the
requested
number
of
bytes
does
not
match
the
actual
number
available
data
might
be
lost,
or
the
program
might
enter
an
endless
wait
state.)
The
suppression
of
the
EOL
sequence
is
frequently
necessary
to
prevent
a
premature
termination
of
the
data
input.
When
not
specified,
the
typical
EOL
termination
occurs
when
an
ASCII
LF
(line
feed)
is
received.
However,
the
LF
bit
pattern
could
coincidentally
occur
randomly
in
a
long
string
of
binary
data,
where
it
might
cause
a
false
termination.
Also,
the
bit
patterns
for
the
ASCII
OR
(carriage
return),
comma,
or
semicolon
might
cause
a
false
termination.
Suppression
of
the
EOL
causes
the
computer
to
accept
all
bit
patterns
as
data,
not
commands,
and
relies
on
the
HP-IB
EOI
(end
or
identify)
line
for
correct
end-of-data
termination.
The
various
programming
codes
that
are
associated
with
the
ENTER
statement
are
listed
in
Tables
3-1
and
3-2,
and
are
explained
in
the
Programming
Codes
subsection.
Related
statements
used
by
some
computers:
CONVERT
IMAGE
IOBUFFER
ON
TIMEOUT
SET
TIMEOUT
TRANSFER
This
completes
the
HP-IB
Command
Statements
subsection.
The
following
material
explains
the
HP
8340B/41B
programming
codes,
and
shows
how
they
are
used
with
the
OUTPUT
and
ENTER
HP-IB
command
statements.
3-58
Operating
Information
HP
8340B/41B

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