R&S SMB SCPI Command Structure and Syntax
1407.0806.32 5.11 E-2
Device-specific
commands
Hierarchy: Device-specific commands are of hierarchical structure (see figure below).
The different levels are represented by combined headers. Headers of the
highest level (root level) have only one key word. This key word denotes a
complete command system
Example: SOURce
This key word denotes the command system SOURce.
For commands of lower levels, the complete path has to be specified, starting
on the left with the highest level, the individual key words being separated by
a colon ":".
Example: SOURce:FM:EXTernal:COUPling AC
This command lies in the fourth level of the SOURce. It sets the coupling of
the external signal source to AC.
SOURce
POWer AM
FM
MODE
INTernal
EXTernal STATe
POLarity
FREQuency
Example for the tree structure of the SCPI command systems; the SOURce system
Multiple key words
Some key words occur on several levels within one command system. Their
effect depends on the structure of the command, i. e. on the position in the
command header they are inserted in.
Example:
SOURce:FM:POLarity NORMal
This command contains key word POLarity in the third command level. It
defines the polarity between modulator and modulation signal.
SOURce:FM:EXTernal:POLarity NORMal
This command contains key word POLarity in the fourth command level. It
defines the polarity between modulation voltage and the resulting direction of
the modulation only for the external signal source indicated.
Optional key words:
Some command systems permit certain key words to be optionally inserted
into the header or omitted. These key words are marked by square brackets
in this manual. The full command length must be recognized by the
instrument for reasons of compatibility with the SCPI standard. Some
commands are considerably shortened by omitting optional key words.
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