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the matching command. The parameter type is listed adjacent to
each named parameter.
More About Commands
Query and Event Commands. Because you can query any value that
you can set, the query form of each command is not shown explicitly
in the command tables. For example, the presence of the synthesizer
: SWEep :
DWELl
command implies that a : SWEep :
DWELl?
also exists.
If you see a table containing a command ending with a question
mark, it is a query only command. Some commands are
ewe&,
and cannot be queried. An event has no corresponding setting if it
causes something to happen inside the instrument at a particular
instant. For example, :
INITiate
:
IMMediate
causes a certain trigger
sequence to initiate. Because it is an event, there is no query form of
:
INITiate
:
IMMediate.
Implied Commands. Implied commands appear in square brackets
in the command table. If you send a subcommand immediately
preceding an implied command, but do not send the implied
command, the instrument assumes you intend to use the implied
command, and behaves just as if you had sent it. Note that this
means the instrument expects you to include any parameters
required by the implied command. The following example illustrates
equivalent ways to program the synthesizer using explicit and implied
commands.
Example synthesizer commands with and without an implied
commands:
: SWEep :
MANual
: RELat ive 6
using explicit commands
:SWEep:MANual 6
using implied commands
Optional Parameters. Optional parameter names are enclosed in
square brackets in the command table. If you do not send a value
for an optional parameter, the instrument chooses a default value.
The instrument’s command dictionary documents the values used for
optional parameters.
Program Message Examples
The following parts of the synthesizer SCPI command set will be
used to demonstrate how to create complete SCPI program messages:
:FREquency
C:CWl
:MULTiplier
: STATE
: POWER
I:
: LEVEL]
Example 1:
“FREQuency : CW 5 GHZ;
MULTiplier
2”
1-72 Getting Started Programming