Syntax of Program Messages

In SCPI all messages that you can send to an instrument are divided into two categories: commands (that do not imply getting any response) and queries (that allow to get response back from the instrument). Queries have question mark ('?') at the end of command header.

A command or query is called a program message unit. A program message unit consists of a header followed by zero or more parameters:

<header> [parameter [,parameter ,...]]

For example, in the query


FETCH:ARRAY is a header and MAX and A are parameters.

One or more program message units (commands) may be sent within a simple program message:

<program message unit>; <program message unit>; <program message unit>...

For example,