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VX4101A MultiPaq Instrument User Manual
2–1
About Global and Instrument Commands
The SCPI command set included with the VX4101A controls both overall
functions of the MultiPaqt instrument, and commands with unique behaviors
for each individual instrument associated with the
MultiPaqtInstrument. The
command set includes the following types of commands:
H Global commands
H Instrument commands
For detailed descriptions of global commands and specific commands for each
instrument module, see Syntax and Commands.
About Global Commands
Global commands and queries have the same behavior regardless of which
instrument you select. Examples of global commands include *RST, *IDN?, and
INSTrument:SELect.
About Instrument Commands
Instrument commands and queries have different behavior depending upon
which instrument you select. An example of an instrument class query is
MEASure:VOLT:DC?. This query is valid for both the DMM and the Counter,
but each instrument uses them differently.
The SCPI INSTrument:SELect command enables the VX4101A to differentiate
the same command, such as MEAS:VOLT:DC?, from its unique functionality
with each instrument. This command permits the MEASure command to be
directed to a specific instrument. An example of how each instrument uses the
associated INSTRument command is described in Syntax and Commands for
each each instrument.
NOTE. Only one instrument can be selected at a time. This is referred to as the
active instrument. The active instrument is the only device able to receive
commands. Other instruments can be executing previously entered commands or
queries, such as scan or measure commands, in parallel with the active
instrument.