Agilent Technologies 54600 Series Handbuch

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Programmer’s Guide

Publication number 54600-97032

April 2001

This guide contains programming in ormation or the ollowing

Agilent oscilloscope models:

54600

54601

54602

54603

54610

54615

54616

For Sa ety in ormation, Warranties, and Regulatory

in ormation, see the pages behind the Index.

Agilent 54600-Series

Oscilloscopes

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Programming the Oscilloscope

When you attach an inter ace module to the rear o the Agilent 54600-

Series Oscilloscopes, the oscilloscope becomes programmable. That is,

you can hook a controller (such as a PC or workstation) to the

oscilloscope, and write programs on that controller to automate

oscilloscope setup and data capture. Both GPIB (also known as

IEEE-488) and RS-232-C inter aces are available.

The ollowing igure shows the basic structure o every program you

will write or the oscilloscope.

Initialize

To ensure consistent, repeatable per ormance, you need to start the

program, controller, and oscilloscope in a known state. Without

correct initialization, your program may run correctly in one instance

and not in another. This might be due to changes made in

con iguration by previous program runs or rom the ront panel o the

oscilloscope.

Program initialization de ines and initializes variables, allocates

memory, or tests system con iguration.

Controller initialization ensures that the inter ace to the

oscilloscope (either GPIB or RS-232) is properly setup and ready

or data trans er.

Oscilloscope initialization sets the channel, trigger, timebase, and

acquisition subsystems or the desired measurement.

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Capture

Once you initialize the oscilloscope, you can begin capturing data or

measurement. Remember that while the oscilloscope is responding to

commands rom the controller, it is not per orming acquisitions. Also,

when you change the oscilloscope con iguration, any data already

captured is most likely invalid.

To collect data, you use the DIGITIZE command. This command

clears the wave orm bu ers and starts the acquisition process.

Acquisition continues until the criteria, such as number o averages,

completion criteria, and number o points is satis ied. Once the

criteria is satis ied, the acquisition process is stopped. The acquired

data is displayed by the oscilloscope, and the captured data can be

measured, stored in memory in the oscilloscope, or trans erred to the

controller or urther analysis. Any additional commands sent while

DIGITIZE is working are bu ered until DIGITIZE is complete.

You could also start the oscilloscope running, then use a wait loop in

your program to ensure that the oscilloscope has completed at least

one acquisition be ore you make a measurement. This is not

recommended, because the needed length o the wait loop may vary,

causing your program to ail. DIGITIZE, on the other hand, ensures

that data capture is complete. Also, DIGITIZE, when complete, stops

the acquisition process, so that all measurements are on displayed

data, not a constantly changing data set.

Analyze

A ter the oscilloscope has completed an acquisition, you can ind out

more about the data, either by using the oscilloscope measurements

or by trans erring the data to the controller or manipulation by your

program. Built-in measurements include IEEE standard parametric

measurements (such as Vpp, requency, pulse width) or the

positioning and reading o voltage and time markers.

Using the WAVEFORM commands, you can trans er the data to your

controller or special analysis, i desired.

iii

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In This Boo

The Agilent 54600-Series Oscilloscopes Programmer’s Guide is your

introduction to programming the Agilent 54600-Series Oscilloscopes using an

instrument controller. This book, with the online Agilent 54600-Series

Oscilloscopes Programmer’s Reference, provides a comprehensive

description o the oscilloscope’s programmatic inter ace. The Programmer’s

Reference is supplied as a Microso t Windows Help ile on a 3.5" diskette.

To program the Agilent 54600-Series Oscilloscope, you need an inter ace

module, such as the Agilent 54650A or 54651A. You also need an instrument

controller that supports either the IEEE-488 or RS-232-C inter ace

standards, and a programming language capable o communicating with these

inter aces. You can also use the Agilent 54655A/56A Test Automation Module

and the Agilent 54658A/59B Measurement/Storage Module.

Chapter 1 gives a general overview o oscilloscope programming.

Chapter 2 shows a simple program, explains its operation, and

discusses considerations or data types.

Chapter 3 discusses the general considerations or programming the

instrument over an GPIB inter ace.

Chapter 4 discusses the general considerations or programming the

instrument over an RS-232-C inter ace.

Chapter 5 describes conventions used in representing syntax o

commands throughout this book and in the online Agilent 54600-Series

Oscilloscopes Programmer’s Reference, and gives an overview o the

command set.

Chapter 6 discusses the oscilloscope status registers and how to use

them in your programs.

Chapter 7 tells how to install the Agilent 54600-Series Oscilloscopes

Programmer’s Reference online help ile in Microso t Windows, and

explains help ile navigation.

Chapter 8 lists all the commands and queries available or

programming the oscilloscope.

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For in ormation on oscilloscope

operation, see the Agilent 54600-Series

Oscilloscopes User and Service Guide.

For in ormation on inter ace

con iguration, see the documentation or

the oscilloscope and the inter ace card

used in your controller ( or example, the

82341C inter ace or IBM PC-compatible

computers).

Programming Getting Started

Programming over GPIB

Programming over RS-232-C

Index

Programming and

Documentation Conventions

Status Reporting

Installing and Using the

Programmer’s Reference

Programmer’s Quick Reference

Introduction to Programming

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Contents

1 Introduction to Programming

Talking to the Instrument 1–3

Program Message Syntax 1–4

Combining Commands from the Same Subsystem 1–7

uplicate Mnemonics 1–7

Query Command 1–8

Program Header Options 1–9

Program ata Syntax Rules 1–10

Program Message Terminator 1–12

Selecting Multiple Subsystems 1–12

2 Programming Getting Started

Initialization 2–3

Autoscale 2–4

Setting Up the Instrument 2–4

Example Program 2–5

Using the IGitize Command 2–6

Receiving Information from the Instrument 2–8

String Variables 2–9

Numeric Variables 2–10

efinite-Length Block Response ata 2–11

Multiple Queries 2–12

Instrument Status 2–12

3 Programming over GPIB

Interface Capabilities 3–3

Command and data concepts 3–3

Addressing 3–4

Communicating over the bus 3–5

Lockout 3–6

Bus Commands 3–6

4 Programming over RS-232-C

Interface Operation 4–3

Cables 4–3

Contents–1

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Minimum three-wire interface with software protocol 4–4

Extended interface with hardware handshake 4–5

Configuring the Interface 4–7

Interface Capabilities 4–8

Communicating over the RS-232-C bus 4–9

Lockout Command 4–10

5 Programming and Documentation Conventions

Command Set Organization 5–3

The Command Tree 5–6

Truncation Rules 5–10

Infinity Representation 5–11

Sequential and Overlapped Commands 5–11

Response Generation 5–11

Notation Conventions and efinitions 5–12

Program Examples 5–13

6 Status Reporting

Serial Poll 6–6

Installing and Using the Programmer’s Reference

To install the help file under Microsoft Windows 7–3

To get updated help and program files via the Internet 7–4

To start the help file 7–5

To navigate through the help file 7–6

8 Programmer’s Quick Reference

Conventions 8–3

Suffix Multipliers 8–3

Commands and Queries 8–4

Index

Contents

Contents–2

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Introduction to Programming

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