Tektronix 2221 - COMMUNICATION AND WAVEFORM TRANSFER; MESSAGES AND COMMUNICATION PROTOCOL

Options and
Accessories -
2221
Operators
COMMUNICATION
AND
WAVEFORM
TRANSFER
C
This
subsection
contains
information
common to
both
Option 10 and
Option 12. The
commands
available , the
command
protocol
,
waveform
transfer
information , and
the
service
request
status
bytes
are
included in this
subsection
.
READOUT
/
MESSAGE
COMMAND
CHARACTER
SET
П
Л
п
П
Л
П
Л
П
П
Character
translations
performed by
the
MESsage
com
mand and
query ,
when
sending data to
or
receiving data
from the
CRT
readout
, are
indicated in
Table 7-14 . The
standard
ASCII
character
codes
are
given
in
Table
7-15
.
in the
Command
tables
found
at
the
end
of
this
section ,
headers and
arguments are
listed
in
a
combination
of
upper - case and lower - case characters . The instrument
accepts
abbreviated
headers and
arguments that
contain
at least
the upper -
case
characters
shown in the
tables
(
whether
sent
in upper
case or lower
case ) . The
lower
case
characters
may be
added
to
the
abbreviated
(
upper
case )
version
, but
they can only
be those
shown
in
lower
case . For a
query , the
question
mark
must
immediately
fol
low the
header . For
example , any
of the
following
formats
are
acceptable to the
oscilloscope
:
NOTE
Values in
Table
7-14
that
have no
CRT
equivalent
are
translated into
spaces
when
sent to the
display .
VMO
?
or
vmo
?
VMOd
?
or
vmod
?
VMOde ? or
vmode ?
MESSAGES
AND
COMMUNICATION
PROTOCOL
HEADERS - A
command
consists of at
least
a
header
.
Each
command
has
a
unique
header ,
which
may be all
that is
needed
to
invoke a
command ; for
example
:
INIT
OPC
П
The
commands available
to the
user via
either the
Option
10
GPIB or the
Option
12
RS - 232 - C
communica
tions
option
can
set
some
of the
instrument's
digital
storage
operating
modes ,
query the
results of
measure
ments
made
, or
query the
state of the
oscilloscope . The
commands are
specified
in
mnemonics that are
related to
the
functions
implemented . For
example ,
the
command
INIt
initializes
instrument
settings to
states
that
would
exist if the
instrument's
power
was
cycled . To
further
facilitate
programming
,
command
mnemonics are
similar
to
front
-
panel control
names .
ARGUMENTS —
Some
commands
require the
addition
of
arguments to
their
headers
to
describe
exactly
what
is
to be
done
. If
there
is
more
to
the
command
than
just
the
header (
including
the
question
mark
if
it is a
query
) ,
then
the
header
must
be
followed by at
least
one
space .
In
some
cases
,
the
argument is a
single word ; for
example :
NOTE
All
measurement
results
returned by
the options
have
the
same
accuracy
as
the main
instrument . REFTO REF4
PLOT STArt
Commands
In
other
cases
,
the
argument
itself
requires
another
argument
.
When
a
second
argument
, or
" link
argument
, " is
required , a
colon
must
separate the
two
arguments .
Two
examples of this are :
П
П
7
Л
Л
I П
П
ACQuisition
REPetitive :
SAMple
Commands for
this
instrument , like
those
for
other
Tektronix
instruments ,
follow
the
conventions
established
in a
Tektronix
Codes and
Formats
Standard . The
com
mand
words
were
chosen to be
as
understandable as
pos
sible , while
still
allowing a user
familiar
with
the
commands
to
reduce the
number
of
key
strokes
needed and still
have
the
command
unambiguous .
Syntax
is
also
standardized
to make
the
commands
easier to learn .
and
WFMpre
XINcr : 1.0E
- 3
C
7-17