Ametek Lx Series II Programming Manual Instrukcja Użytkownika Pobierz pdf (Strona 16)

Programming Manual Lx \ Ls Series II

2. Introduction to SCPI

SCPI (Standard Commands for Programmable Instruments) is a programming language for

controlling instrument functions over the IEEE-488. SCPI is layered on top of the hardware-portion

of IEEE 488.2. The same SCPI commands and parameters control the same functions in different

classes of instruments.

2.1 Conventions Used in This Manual

Angle brackets <> Items within angle brackets are parameter abbreviations. For

example, <NR1> indicates a specific form of numerical data.

Vertical bar | Vertical bars separate alternative parameters. For example,

NORM | TEXT indicates that either "TEXT" or "NORM" can be used as a

parameter.

Square Brackets [] Items within square brackets are optional. The representation

[SOURce:]LIST means that SOURce: may be omitted.

Braces {} Braces indicate parameters that may be repeated zero or more

times. It is used especially for showing arrays. The notation <A> <,B>

shows that parameter "A" must be entered, while parameter "B" may be

omitted or may be entered one or more times.

2.2 The SCPI Commands and Messages

2.2.1 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 for the AC source SCPI tree structure.

2.2.2 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."

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 241 242

Brak uwag

Ametek Lx Series II Programming Manual Instrukcja Użytkownika Strona 16