2 Introduction to Programming
36 Keysight Models 6811C, 6812C, and 6813C Programming Guide
Types of SCPI commands
SCPI has two types of commands: common and subsystem.
– Common commands generally are not related to specific operation but to
controlling overall ac source functions, such as reset, status, and
synchronization. All common commands consist of a three-letter mnemonic
preceded by an asterisk: *RST, *IDN?, *SRE 8
– Subsystem commands perform specific ac source functions. They are
organized into an inverted tree structure with the “root” at the top. Some are
single commands while others are grouped within specific subsystems.
Refer to Appendix A, "SCPI Command Tree” for the ac source SCPI tree structure.
Types of SCPI messages
There are two types of SCPI messages: program and response.
– A program message consists of one or more properly formatted SCPI
commands sent from the controller to the ac source. The message, which may
be sent at any time, requests the ac source to perform some action.
– A response message consists of data in a specific SCPI format sent from the ac
source to the controller. The ac source sends the message only when
commanded by a program message called a “query”.
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