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4349B
Program
Message
Syntax
This
section
provides
an
example
of
constructing
of
a
SCPI
program
message
.
A
program
message
is
the
message
sent
from
a
computer
to
an
instrument.
Program
messages
consist
of
commands
combined
with
appropriate
punctuation
and
program
message
terminators
.
Case
Letter
case
(upper
and
lower)
is
ignored.
Program
Message
T
erminator
A
program
message
must
end
with
one
of
the
three
program
message
terminators,
<new
line> ,
<^END> ,
or
<new
line><^END>.
<^END>
means
that
EOI
is
asserted
on
the
GPIB
interface
at
the
same
time
the
preceding
data
byte
is
sent.
F
or
example
,
HP
B
ASIC
OUTPUT
statement
automatically
sends
an
message
terminator
after
the
last
data
byte
is
sent.
If
you
are
using
a
PC,
you
can
usually
congure
your
system
to
send
whatever
terminator
you
specify
.
Subsystem
Command
Syntax
Subsystem
command
consists
of
the
level
mnemonics
which
are
separated
with
colons
.
F
or
example
,
command
form
of
APERture
under
[SENSe ]:CURRent
subsystem
becomes
as
follows:
:CURRent:APERture
Abbreviated
mnemonics
are
also
available
for
command
headers
.
In
the
above
example
,
:CURR:APER
is
available
.
Common
Command
Syntax
Common
commands
do
not
have
a
hierarchical
structure
.
They
are
just
sent
as
follows:
*CLS
P
arameters
There
must
be
a
<space>
between
the
last
command
mnemonic
and
the
rst
parameter
in
a
subsystem
command.
:CURR:APER t parameter
t
means
a
space
(ASCII
character
(decimal
32))
is
inserted
here
.
If
you
send
more
than
one
parameter
with
a
single
command,
each
parameter
must
be
separated
by
a
comma.
F
or
example
,
:POINts
command
of
DATA
subsystem
is
followed
by
two
parameters
as
follows
.
:DATA:POIN t parameter, parameter
GPIB
Reference
5-5
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Страница 29: ...C Overload No Contact Operations Messages Instrument Errors Messages 2 GPIB Errors Messages 3 Index Contents 9 ...
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