Agilent Technologies 664XA Series Instrucciones de funcionamiento

PROGRAMMING GUIDE

GPIB DC POWER SUPPLIES

Agilent Technologies Models

664xA, 665xA, 667xA, 668xA, and 669xA

AgilentPart No. 5964-8269 Printed in Malaysia

Microfiche Part No. 5964-8270 July, 2001

Safety Guidelines

The beginning of the power supply Operating Manual has a Safety Summary page. Be sure you are familiar with the

information on that page before programming the power supply for operation from a controller.

ENERGY HAZARD. Power supplies with high output currents (such as the Series 668xA/669xA)

can provide more than 240 VA at more than 2 V. If the output connections touch, severe arcing may

occur resulting in burns, ignition or welding of parts. Take proper precautions before remotely

programming the output circuits.

Printing History

The edition and current revision of this guide are indicated below. Reprints of this guide containing minor corrections and

updates may have the same printing date. Revised editions are identified by a new printing date. A revised edition

incorporates all new or corrected material since the previous printing. Changes to the guide occurring between revisions are

covered by change sheets shipped with the guide.

Edition 1......... July, 2001

This document contains proprietary information protected by copyright. All rights are reserved. No part of this document

may be photocopied, reproduced, or translated into another language without the prior consent of Agilent Technologies.

The information contained in this document is subject to change without notice.

Contents

Safety Guidelines 2

Printing History 2

Contents 3

GENERAL INFORMATION 7

About this Guide 7

Documentation Summary 7

User’s Guide 7

External Documents 7

Prerequisites for Using this Guide 8

VXIplug&play Power Product Instrument Drivers 8

Downloading and Installing the Driver 8

Accessing Online Help 8

REMOTE PROGRAMMING 9

GPIB Capabilities Of The Power Supply 9

Introduction To SCPI 9

Conventions 9

SCPI Messages 10

Types of SCPI Commands 10

Structure of a SCPI Message 10

Parts of a SCPI Message 11

Traversing the Command Tree 12

Including Common Commands 14

SCPI Queries 14

Value Coupling 14

SCPI Data Formats 14

Examples 15

Controlling Output 16

Saving and Recalling States 17

Writing to the Display 17

Programming Status 17

Programming the Digital I/O Port 18

System Considerations 18

The GPIB Address 18

DOS Drivers 20

Agilent BASIC Controllers 20

Sample Program Code 20

LANGUAGE DICTIONARY 25

Introduction 25

Parameters 25

Related Commands 25

Order of Presentation 25

Common Commands 25

Subsystem Commands 25

Description Of Common Commands 26

*CLS 27

*ESE 27

*ESR? 28

*IDN? 28

*OPC 28

*OPC? 29

*OPT? 29

*PSC 29

*RCL 30

*RST 31

*SAV 31

*SRE 32

*STB? 32

*TRG 33

*TST? 33

*WAI 33

Description of Subsystem Commands 34

ABOR 34

Calibration Commands 34

Current Subsystem 35

CURR 35

CURR:TRIG 35

CURR:PROT:STAT 35

DIG:DATA 36

Display Subsystem 36

DISP 36

DISP:MODE 37

DISP:TEXT 37

Initiate Subsystem 38

INIT 38

INIT:CONT 38

Measure Subsystem 38

MEAS:CURR? 38

MEAS:VOLT? 38

Output Subsystem 39

OUTP 39

OUTP:PROT:CLE 39

OUTP:PROT:DEL 39

OUTP:REL 40

OUTP:REL:POL 40

Status Subsystem 41

STAT:PRES 41

Status Operation Registers 41

STAT:OPER? 41

STAT:OPER:COND? 41

STAT:OPER:ENAB 42

STAT:OPER NTR 42

STAT:OPER PTR 42

Status Questionable Registers 43

STAT:OUES? 43

STAT:QUES:COND? 43

STAT:QUES:ENAB 43

STAT:QUES NTR 44

STAT:QUES PTR 44

System Commands 44

SYST:ERR? 44

SYST:LANG 45

SYST:VERS? 45

Trigger Subsystem 45

TRIG 45

TRIG:SOUR 46

Voltage Subsystem 46

VOLT 46

VOLT:TRIG 46

VOLT:PROT 47

Command Summary 47

Programming Parameters 49

STATUS REPORTING 51

Power Supply Status Structure 51

Operation Status Group 51

Questionable Status Group 53

Standard Event Status Group 53

Status Byte Register 54

The RQS Bit 54

The MSS Bit 54

Determining the Cause of a Service Interrupt 54

Service Request Enable Register 54

Output Queue 54

Initial Conditions At Power On 54

Status Registers 54

The PON (Power-On) Bit 55

Examples 55

Servicing an Operation Status Mode Event 55

Adding More Operation Events 56

Servicing Questionable Status Events 56

Monitoring Both Phases of a Status Transition 56

SCPI Command Completion 57

DFI (Discrete Fault Indicator) 57

RI (Remote Inhibit) 57

ERROR MESSAGES 59

Power Supply Hardware Error Messages 59

Calibration Error Messages 59

System Error Messages 59

SCPI CONFORMANCE INFORMATION 61

SCPI Version 61

SCPI Confirmed Commands 61

SCPI Approved Commands 61

NON-SCPI Commands 62

COMPATIBILITY LANGUAGE 63

INDEX 67

Introduction 7

General Information

About this Guide

This guide provides remote programming information for the following series of GPIB programmable power supplies:

•AGILENT Series 664xA, 665xA, 667xA, 668xA, and 669xA

You will find the following information in the rest of this guide:

Chapter 2 Introduction to SCPI messages structure, syntax, and data formats. Examples of SCPI programs.

Chapter 3 Dictionary of SCPI commands. Table of programming parameters.

Chapter 4 Description of the status registers.

Chapter 5 Error messages.

Appendix A SCPI conformance information.

Appendix B Use of the alternate Compatibility programming language.

Documentation Summary

User’s Guide

The Operating Guide, shipped with the power supply, has information helpful to programming the power supply and

explains the SCPI commands used for remote calibration. Sample calibration and verification programs are included.

External Documents

SCPI References

The following documents will assist you with programming in SCPI:

•Standard Commands for Programmable Instruments Volume 1, Syntax and Style

•Standard Commands for Programmable Instruments Volume 2, Command References

•Standard Commands for Programmable Instruments Volume 3, Data Interchange Format

•Standard Commands for Programmable Instruments Volume 4, Instrument Classes

To obtain a copy of the above documents, contact: Fred Bode, Executive Director, SCPI Consortium, 8380 Hercules Drive,

Suite P3, Ls Mesa, CA 91942, USA

GPIB References

The most important GPIB documents are your controller programming manuals - Agilent BASIC, GPIB Command Library

for MS DOS, etc. Refer to these for all non-SCPI commands (for example: Local Lockout).

The following are two formal documents concerning the GPIB interface:

aANSI/IEEE Std. 488.1-1987 IEEE Standard Digital Interface for Programmable Instrumentation. Defines the

technical details of the GPIB interface. While much of the information is beyond the need of most programmers, it can serve

to clarify terms used in this guide and in related documents.

aANSI/IEEE Std. 488.2-1987 IEEE Standard Codes, Formats, Protocols, and Common Commands. Recommended

as a reference only if you intend to do fairly sophisticated programming. Helpful for finding precise definitions of certain

types of SCPI message formats, data types, or common commands.

The previous two documents are available from the IEEE (Institute of Electrical and Electronics Engineers), 345 East 47th

Street, New York, NY 10017, USA. The WEB address is www.ieee.org.

8 Introduction

Prerequisites for Using this Guide

This organization of this guide assumes that you know or can learn the following information:

1. How to program in your controller language (Agilent BASIC, QUICKBASIC, C, etc.).

2. The basics of the GPIB (IEEE 488).

3. How to program I/O statements for an IEEE 488 bus instrument. From a programming aspect, the power supply is

simply a bus instrument.

4. How to format ASCII statements within you I/O programming statements. SCPI commands are nothing more than

ASCII data strings incorporated within those I/O statements.

5. The basic operating principles of the power supply as explained in “Chapter 5 – Front Panel Operation” of the

Operating Guide.

6. How to set the GPIB address of the power supply. This cannot be done remotely, but only from the supply’s front

panel (see System Considerations in “Chapter 2 – Remote Programming”).

VXIplug&play Power Product Instrument Drivers

VXIplug&play instrument drivers for Microsoft Windows 95 and Windows NT are now available on the Web at

http://www.agilent.com/find/drivers. These instrument drivers provide a high-level programming interface to your Agilent

Technologies instrument. VXIplug&play instrument drivers are an alternative to programming your instrument with SCPI

command strings. Because the instrument driver's function calls work together on top of the VISA I/O library, a single

instrument driver can be used with multiple application environments.

Supported Applications System Requirements

aAgilent VEE

aMicrosoft Visual BASIC

aMicrosoft Visual C/C++

aBorland C/C++

aNational Instruments LabVIEW

aNational Instruments LabWindows/CVI

The VXIplug&play Power Products instrument driver

complies with the following:

aMicrosoft Windows 95

aMicrosoft Windows NT

aHP VISA revision F.01.02

aNational Instruments VISA 1.1

Downloading and Installing the Driver

NOTE: Before installing the VXIplug&play instrument driver, make sure that you have one of the supported applications

installed and running on your computer.

1. Access Agilent Technologies' Web site at http://www.agilent.com/find/drivers.

2. Select the instrument for which you need the driver.

3. Click on the driver, either Windows 95 or Windows NT, and download the executable file to your pc.

4. Locate the file that you downloaded from the Web. From the Start menu select Run <path>:\agxxxx.exe - where

<path> is the directory path where the file is located, and agxxxx is the instrument driver that you downloaded .

5. Follow the directions on the screen to install the software. The default installation selections will work in most

cases. The readme.txt file contains product updates or corrections that are not documented in the on-line help. If

you decide to install this file, use any text editor to open and read it.

6. To use the VXIplug&play instrument driver, follow the directions in the VXIplug&play online help under

“Introduction to Programming”.

Accessing Online Help

A comprehensive online programming reference is provided with the driver. It describes how to get started using the

instrument driver with Agilent VEE, LabVIEW, and LabWindows. It includes complete descriptions of all function calls

as well as example programs in C/C++ and Visual BASIC.

aTo access the online help when you have chosen the default Vxipnp start folder, click on the Start button and select

Programs | Vxipnp | Agxxxx Help (32-bit).

- where agxxxx is the instrument driver.

Remote Programming 9

Remote Programming

GPIB Capabilities Of The Power Supply

All power supply functions except for setting the GPIB address are programmable over the IEEE 488 bus (also known as

the General Purpose Interface Bus or "GPIB"). The IEEE 488.1 capabilities of the power supply are listed in the

Supplemental Characteristics of the Operating Guide. The power supply operates from a GPIB address that is set from the

front panel (see System Considerations at the end of this chapter).

Introduction To SCPI

lmportant Learn the basics of power supply operation (see "Chapter 5 - Front Panel Operation" in the power supply

Operating Guide) before using SCPI.

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

over the GPIB (IEEE 488) instrument bus. SCPI is intended to function with standard GPIB hardware and conforms to the

IEEE Standard Digital Interface for Programmable Instrumentation. 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. For

example, you would use the same DISPlay command to control the power supply display state and the display state of a

SCPI-compatible multimeter.

Note HPSL and TMSL (Test and Measurement System Language) were earlier versions of SCPI. If you have

programmed in either, then you probably can go directly to "Chapter 3 - Language Dictionary".

Conventions

The following conventions are used throughout this chapter:

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

<NR1> indicates a specific form of numerical data.

Vertical bar | Vertical bars separate one of two or more alternative parameters. For

example, 0|OFF indicates that you may enter either "0" or "OFF" for the

required parameter.

Square

Brackets

[ ] Items within square brackets are optional. The representation

[SOURce]:CURRent 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

"A" is a required parameter, while "B" may be omitted or may be entered

one or more times.

Boldface font Boldface font is used to emphasize syntax in command definitions.

TRIGger:DELay <NRf> shows a command syntax.

Computer font Computer font is used to show program text within normal text.

TRIGger:DELay .5 represents program text.

10 Remote Programming

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 power supply. The message, which may be sent at any time, requests the power supply to perform some action.

•A response message consists of data in a specific SCPI format sent from the power supply to the controller.

The power supply sends the message only when commanded by a special program message called a "query."

Types of SCPI Commands

SCPI has two types of commands, common and subsystem.

Common Commands

Common commands (see Figure 3-1) generally are not related to specific operation but to controlling overall power supply

functions, such as reset, status, and synchronization. All common commands consist of a three-letter nmemonic preceded

by an asterisk:

*RST *IDN? *SRE 8

Subsystem Commands

Subsystem commands (see Figure 3-2) perform specific power supply functions. They are organized into an inverted tree

structure with the "root" at the top. Some are single commands while others are grouped under other subsystems.

Structure of a SCPI Message

SCPI messages consist of one or more message units ending in a message terminator. The terminator is not part of the

syntax, but implicit in the way your programming language indicates the end of a line (such as a newline or end-of-line

character).

The Message Unit

The simplest SCPI command is a single message unit consisting of a command header (or keyword) followed by a message

terminator.

ABOR

VOLT?

The message unit may include a parameter after the header. The parameter usually is numeric, but it can be a string:

VOLT 20

VOLT MAX

Combining Message Units

The following command message (see Figure 2-1) is briefly described here, with more details in subsequent paragraphs.

VOLT:LEV 4.5;PROT 4.8;:CURR?<NL>

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