Common commands and queries (IEEE
488.2)
The IEEE 488.2 standard defines a set of common
commands
and
queries which
implement common system functions.
Common command and query mnemonics are preceded by an asterisk
(*)
to
distinguish
them
from
device dependent data such
as instrument programming
strings. The following
common commands
and
queries are implemented in the 2040 series:
Mnemonic Name and
Description
*IDN? Identification Query. Returns an arbitrary ASCII response
comprising
four
data fields in the format:
<Manufacturer>,<type number>,<serial number>,<firmware
version
number><EOM>.
Example: MARCONI INSTRUMENTS,
2041
,123456789, 2. 008<EOM>
*OPT? Option Identification Query. Returns an arbitrary ASCII
response
containing a data field for each fitted option in the format:
coption a>,<option d>,
...
,<option
«><EOM>
Example: SECOND OSCILLATOR, PULSE MODULATION,
+19
dBm OUTPUT <EOM>
If no options are fitted, ASCII
'O'
is
returned.
Note...
Because
an
Arbitrary
ASCII Response ends
with the Response Message Terminator
(<EOM>) either *IDN? or *OPT? must be the last Query Message Unit in a
Program
Message.
*RST Reset Command. Sets the instrument functions to the factory default
power
up state. The default settings appear in Table
3-2-1.
*TST? Self Test Query. Returns
a
'()'
when the GPIB interface and processor are
operating.
*OPC Operation Complete Command. Sets the Operation
Complete bit
in the
Standard Event Status Register when execution of the preceding operation
is
complete.
*OPC? Operation Complete Query. Returns a T when the preceding operation has
been completed.
*WAI Wait to Continue Command. Inhibits execution of an
overlapped
command until
the
execution
of the
preceding operation has been
completed.
*TRG Trigger Command. Equivalent to Group Execute Trigger.
*PUD <block> Protected User Data Command. Sets the Protected User Data, accepts
Definite Block Data when enabled. This command is covered in further
detail in the
Service
Manual.
3-2-6
46882-074C
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