R&S SMC100A SCPI Command Structure and Syntax
1411.4060.32 5.11 E-1
SCPI Command Structure and Syntax
The commands consist of a so-called header and, in most cases, one or more parameters. The header
and parameter are separated by a "white space" (ASCII code 0 to 9, 11 to 32 decimal, e.g. blank). The
headers may consist of several key words. Queries are formed by directly appending a question mark
to the header.
Note:
The commands used in the following examples are not in every case implemented in the instrument.
Common Commands
Common commands consist of a header preceded by an asterisk "*" and one
or more parameters, if any.
Examples:
*RST
RESET, resets the device
*ESE 253
EVENT STATUS ENABLE, sets the bits of the event
status enable register
*ESR?
EVENT STATUS QUERY, queries the contents of the
event status register.
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.
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