
1-28 Programming Guide
Preparing for Use ESG Family Signal Generators
Getting Started with SCPI
Types of Commands
Commands can be separated into two groups, common commands and subsystem
commands.
Common commands are generally not measurement related. They are used to manage
macros, status registers, synchronization, and data storage. Common commands are easy
to recognize because they all begin with an asterisk, such as *IDN?, *OPC, and *RST.
Common commands are defined by IEEE 488.2.
Subsystem commands include all measurement functions and some general purpose
functions. Subsystem commands are distinguished by the colon used between keywords, as
in :FREQuency:CW?. Each command subsystem is a set of commands that roughly
corresponds to a functional block inside the instrument. For example, the :POWer
subsystem contains commands for power generation, while the :STATus subsystem
contains commands for accessing status registers.
Figure 1-9. SCPI Command Types
The remaining paragraphs in this subsection discuss subsystem commands in more detail.
Remember, some commands are implemented in one instrument and not in another,
depending on its measurement function.
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