HP 54620A Manual

Programmer’s Guide

Publication Number 54620-97012

October 1995 (pdf version Dec 1998)

For Safetyinformation, Warranties,and Regulatory information,

seethepagesbehind the Index.

©Copyright Hewlett-Packard Company1994, 1995

All RightsReserved

HP 54620A/C Logic Analyzer

Programming the Logic Analyzer

When you attach an interface module to the rear of the HP 54620A or

HP 54620C (color) Logic Analyzer, the analyzer becomes

programmable. That is, you can hook a controller (such as a PC or

workstation) to the analyzer, and write programs on that controller to

automate analyzer setup and data capture. Both HP-IB (also known as

GP-IB, IEEE-488) and RS-232-C interfaces are available.

The following figure shows the basic structure of every program you

will write for the analyzer.

Initialize

To ensure consistent, repeatable performance, you need to start the

program, controller, and analyzer 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 configuration by

previous program runs or from the front panel of the logic analyzer.

•Program initialization defines and initializes variables, allocates

memory, or tests system configuration.

•Controller initialization ensures that the interface to the analyzer

(either HP-IB or RS-232) is properly setup and ready for data

transfer.

•Analyzer initialization sets the channel configuration and labels,

threshold voltages, trigger specification and mode, timebase, and

acquisition type.

Capture

Once you initialize the analyzer, you can begin capturing data for

analysis. Remember that while the analyzer is responding to

commands from the controller, it is not performing acquisitions. Also,

when you change the analyzer configuration, any data already

captured is most likely invalid.

To collect data, you use the :DIGitize command. This command clears

the waveform buffers and starts the acquisition process. Acquisition

continues until acquisition memory is full, then stops. The acquired

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

measured, stored in trace memory in the analyzer, or transferred to

the controller for further analysis. Any additional commands sent

while :DIGitize is working are buffered until :DIGitize is complete.

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

program to ensure that the analyzer has completed at least one

acquisition before you make a measurement. HP does not recommend

this because the needed length of the wait loop may vary, causing

your program to fail. :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 on a constantly changing data set.

Analyze

After the analyzer has completed an acquisition, you can find out

more about the data, either by using the analyzer measurements or by

transferring the data to the controller for manipulation by your

program. Built-in measurements include frequency, duty cycle,

period, positive and negative pulse width, channel-to-channel delay,

and setup and hold time.

Using the :WAVeform commands, you can transfer the data to your

controller. You may want to display the data, compare it to a known

good measurement, or simply check logic patterns at various time

intervals in the acquisition.

In This Book

The HP 54620A/C Programmer’s Guideis your introductionto

programmingtheHP 54620A or HP54620C (color)Logic Analyzer using an

instrumentcontroller.This book, with the HP 54620A/C Programmer’s

Reference,provides a comprehensive description ofthe analyzer’s

programmatic interface.The Programmer’sReferenceis suppliedas a

MicrosoftWindows Helpfile ona 3.5" diskette.

To program the HP54620A/C, you need an interface module, such as the

HP54650A,54651A, or54652B.Youalsoneedaninstrumentcontrollerthat

supportseither the IEEE-488orRS-232-C interface standards,and a

programminglanguage capable of communicatingwith these interfaces.

This bookcontains the followinginformation:

Chapter 1,“Introduction toProgramming,” givesa general overview oflogic

analyzer programming.

Chapter 2,“Programming Getting Started,” shows a simpleprogram, explains

its operation, and discusses considerations for data types.

Chapter 3,“Programming over HP-IB,” discusses the generalconsiderations

for programming the instrumentover an HP-IB interface.

Chapter 4,“Programming over RS-232-C,” discussesthegeneral

considerationsfor programming the instrumentover an RS-232-C interface.

Chapter 5,“Programming and Documentation Conventions,” describes the

conventions used in representingthesyntax ofcommands throughout this

book and the HP 54620A/CProgrammer’sReference,and gives an overview

of the analyzer command set.

Chapter 6,“Status Reporting,” discusses the analyzer statusregisters and

how touse themin your programs.

Chapter7,“Installingand Using the Programmer’s Reference,”tells howto

install the HP 54620A/CProgrammer’sReferenceonline helpfilein

MicrosoftWindows, and explains help file navigation.

Chapter 8,“Programmer’s QuickReference,” lists all the commands and

queriesavailablefor programming the logic analyzer.

For information on analyzer operation,seetheHP 54620A/C User’s Guide.

For information oninterface configuration,seethedocumentation for the

analyzer interface module and theinterface card used in your controller (for

example, the HP82341Ainterface for IBM PC-compatible computers).

ProgrammingGettingStarted

Programmingover HP-IB

Programmingover RS-232-C

Programmingand

DocumentationConventions

Status Reporting

Installing and Using the

Programmer’s Reference

Programmer’s Quick Reference

Introduction to Programming

Index

Contents

1 Introduction to Programming

Talking to the instrument 11

Program message syntax 12

Combining commands from the same subsystem 15

Duplicate mnemonics 15

Query command 16

Program header options 17

Program data syntax rules 18

Program message terminator 20

Selecting multiple subsystems 20

2 Programming Getting Started

Initialization 23

Autoscale 24

Setting up the instrument 24

Example program 25

Program overview 27

Using the :DIGitize command 28

Receiving information from the instrument 30

String variables 31

Numeric variables 32

Definite-length block response data 33

Multiple queries 34

Instrument status 34

3 Programming over HP-IB

Interface capabilities 37

Addressing 37

Communicating over the bus 38

Lockout 39

Bus commands 39

4 Programming over RS-232-C

Interface operation 43

Cables 43

Configuring the interface 46

Interface capabilities 46

Lockout Command 47

5 Programming and Documentation Conventions

Command Set Organization 51

The command tree 52

Truncation rules 56

Infinity representation 57

Sequential and overlapped commands 57

Response generation 57

Notation conventions and definitions 58

Program Examples 59

6 Status Reporting

Serial poll 66

7 Installing and Using the Programmer’s Reference

To install the help file under Microsoft Windows 71

To use the help text and example program files 72

To get updated help and program files via the Internet 73

To start the help file 74

To navigate through the help file 75

8 Programmer’s Quick Reference

Introduction 78

Conventions 79

Suffix multipliers 79

Commands and Queries 80

Index 89

Contents

Introduction to Programming

Chapters 1 and 2 introduce the basics for remote programming of a

logic analyzer. The programming instructions in this manual conform

to the IEEE 488.2 Standard Digital Interface for Programmable

Instrumentation. The programming instructions provide the means of

remote control.

To program the HP 54620A Logic Analyzer or HP 54620C (color)

Logic Analyzer, you must add either an HP-IB (for example,

HP 54650A) or RS-232-C (for example, HP 54651A or HP 54652B)

interface to the rear panel.

You can perform the following basic operations with a controller and a

logic analyzer:

•Set up the instrument.

•Make measurements.

•Get data (waveform, measurements, configuration) from the logic

analyzer.

•Send information (pixel image, configurations) to the logic

analyzer.

Other tasks are accomplished by combining these basic functions.

Languages for Program Examples

The programming examplesfor individual commandsin this manual are written

in HP BASIC or C.

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