Introduction to SCPI command SCPI (Standard Commands for ProgrammMable Instruments abbreviation), that is, the standard command set of program control instruments (programmable instruments). SCPI is a standardized instrument based on the existing standard IEEE 488.1 and IEEE 488.2, and follows the standardized instruments of the floating-point computing rules of the IEEE 754 standard, ISO 646 information exchange 7-bit encoding symbols (equivalent to ASCII programming). programming language. The SCPI command is a tree-like structure, including multiple subsystems. Each subsystem consists of a root keyword and one or several layers of keywords.
Command format The command usually starts with the colon ":". The keywords are separated by the colon ":", followed by the optional parameter settings behind the keywords. Add a question mark "?" Behind the command line, indicating that this function is queried. The command keyword and the first parameter are separated by space, for example: :ACQuire:TYPE :ACQuire:TYPE? Acquire is the root keyword of the command, and Type is the second-level keyword. The command line starts with the colon ":", and at the same time use the colon "::" to separate the keywords at all levels. indicates the settable parameter. The question mark "?" Indicates the query. Command keywords: Acquire:
Type and parameters are separated by spaces. In some commands with parameters, the comma ",", "separate multiple parameters, for example: [:TRACe[ ]]:DATA:VALue volatile, , Symbol Description The following symbols are not sent with commands. 1. Braces {} The content in the brackets is the parameter option. Parameters are usually separated by vertical lines "|". When using the command, one of the parameters must be selected. 2. Vertical line | The vertical line is used to separate multiple parameter options, and one of the parameters must be selected when using the command. 3. Square bracket [] The content in square brackets is omitted.