Types Of Scpi Commands; Types Of Scpi Messages - Keysight Technologies 6811C Programming Manual

2 Introduction to Programming

Types of SCPI commands

SCPI has two types of commands: common and subsystem.
– Common commands generally are not related to specific operation but to
– Subsystem commands perform specific ac source functions. They are
Refer to

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
– A response message consists of data in a specific SCPI format sent from the ac
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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
organized into an inverted tree structure with the "root" at the top. Some are
single commands while others are grouped within specific subsystems.
Appendix A, "SCPI Command Tree"
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.
source to the controller. The ac source sends the message only when
commanded by a program message called a "query".
Keysight Models 6811C, 6812C, and 6813C Programming Guide
for the ac source SCPI tree structure.