Agilent 70700A Programmers Guide

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HEWLETT PACKARD

PROGRAMMING MANUAL

HP 70700A

DIGITIZER

SERIAL NUMBERS

This manual applies directly to HP 70700A Digitizers with serial numbers prefixed 2709A and below.

FIRMWARE VERSIONS

This manual applies directly to HP 70700A Digitizers with firmware versions of 870501 and earlier.

1212 VALLEY HOUSE DRIVE, ROHNERT PARK, CALIFORNIA 94928-4999 U.S.A.

Manual Part Number 70700-90021 Microfiche Part Number 70700-90022

Printed: MAY 1987

Hewlett-Packard Company certifies that this product met its published specifications at the time of shipment from the factory. Hewlett-Packard further

certifies

that its calibration measurements are

traceable to the United States National Bureau of Standards, to the extent allowed by the Bureau’s calibration facility and to the calibration facilities of other International Standards Organization members.

WARRANTY

This Hewlett-Packard instrument product is warranted against defects in material and workmanship for a period of one year from date of shipment. During the warranty period, Hewlett-Packard Company will, at its option, either repair or replace products which prove to be defective.

For warranty service or repair, this product must be returned to a service facility designated by HP. Buyer shall prepay shipping charges to HP and HP shall pay shipping charges to return the product to Buyer. However, Buyer shall pay all shipping charges, duties, and taxes for products returned to HP from another country.

HP warrants that its software and firmware designated by HP for use with an instrument will execute its programming instructions when properly installed on that instrument. HP does not warrant that

the operation of the instrument, or software, or firmware will be uninterrupted or error free.

LIMITATION OF

WlRRANTY

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer, Buyer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental specifications for the product, or improper site preparation or maintenance.

NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. HP SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES

.OF MERCHANTABILITY AND FITNESS FOR A

PARTICULAR PURPOSE.

EXCLUSIVE REMEDIES

THE REMEDIES PROVIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES. HP SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY

Product maintenance agreements and other customer assistance agreements are available for Hewlett-Packard products.

For

any

assistance, contact your nearest Hewlett-Packard Sales and Service Office. Addresses are

provided at the back of this manual.

SAFETY SYMBOLS

The following safety symbols are used throughout this manual and in the instrument. Familiarize yourself with each of the symbols and its meaning before operating this instrument.

Instruction manual symbol. The instrument will be marked with this symbol when it is necessary for the user to refer to the instruction manual in order to protect the instrument against damage. Location of pertinent information within the manual is indicated by use of this symbol in the table of contents.

Indicates dangerous voltages are present. Be extremely careful.

The CAUTION sign denotes a hazard. It calls attention to a procedure which, if not correctly performed or adhered to, could result in damage to or destruction of the instrument. Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met.

The WARNING sign denotes a hazard. It calls attention to a procedure which, if not correctly performed or adhered to, could result in injury or loss of life. Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met.

GENERAL SAFETY CONSIDERATIONS

BEFORE THIS INSTRUMENT IS SWITCHED ON, make sure it has been

properly grounded through the protective conductor of the ac power cable to a socket outlet provided with protective earth contact. Any interruption of the protective (grounding) conductor, inside or outside the instrument, or disconnection of the protective earth terminal can result in personal injury.

There are voltages at many points in the instrument which can, if contacted, cause personal injury. Be extremely careful. Any adjustments or service procedures that require operation of the instrument with protective covers removed should be performed only by trained service personnel.

BEFORE THIS INSTRUMENT IS SWITCHED ON, make sure its primary power circuitry has been adapted to the voltage of the ac power source. Failure to set the ac power input to the correct voltage could cause damage to the instrument when the ac power cable is plugged in.

. . .

111

Chapter 1, General Information

How to Use this Manual Digitizer System Overview

HP 70700A Digitizer Module Overview.......................................................................................

HP 70700A Digitizer Front-Panel Features................................................................................

HP 70700A Digitizer Rear-Panel Features Mainframe/Module Interconnect

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Chapter 2. Programming Fundamentals

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Setup Procedures

Digitizer Channel Number Assignment

Address Switches

Soft-Set HP-IB Addresses

Communication with the System......................................................................................................

Executing Remote Commands......................................................................................................

Initial Program Considerations

Status Reporting Structure.............................................................................................................

Status Byte Register

Service Request Enable Register................................................................................................

Standard Event Status Register Standard Event Status Enable Register Output Queue

Synchronization of Events and Commands..................................................................................

General Sequence.

Synchronization Commands Data Transfer Multiple Digitizer Remote Slaving Procedure

Example Program Remote Slaving Procedure for Random Event Capture Example Program for Random Event Capture

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1-1

l-l

1-3 l-3 l-5 1-6

2-1

2-2

2-4

2-6

z-59

2 ;l

2-13 2-16

2-16 2-18

2-19

2 2 o

2-2 2-22

2-30

2-32

2-37

Chapter 3. Language Reference

Notation Conventions Functional Syntax Conventions

Common Command Set.....................................................................................................................

*CLS, Clear Status *ESE Standard Event Status Enable

*ESR’,

Standard Event Status Register

*IDN, Identification *OPC

Operation Complete. *OPT: Option Identification *RST,Reset *SRE Service Request Enable *STB’ Read Status Byte

*TST Self-Test *WA;, Wait-to-Continue

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3-1

z-i

3-10 3-10

3-11 3-11 3-12 3-12 3-12

3-13

CONTENTS, Continued

Digitizer Top-Level Command Set

AUT, Autoscale BLAN, Blank *CAL, Calibration DIG, Digitize. ERR, Error.

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RUN...................................................

STOP STOR, Store VIEW..

Acquire Subsystem

COUN, Count POIN, Points.

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TYPE..................................................

Calibration Subsystem

ALL.. DATA

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Channel Subsystem

COUP, Coupling DET, Detector. ECL, Emitter-Coupled Logic INP, Input

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OFFS, Offset. PROB, Probes

RANG, Range. SA, Spectrum Analyzer TTL, Transistor-Transistor Logic

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TYPE..................................................

Display Subsystem

CONN, Connect FORM, Format GRAT, Graticule SCR, Screen STR, String TMAR, Time Markers. VMAR, Voltage Markers

Domain Subsystem

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TYPE..................................................

Function Subsystem

ADD, Addition INV, Invert MULT, Multiply OFFS, Offset.

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ONLY..................................................3-4

RANG, Range SUBT, Subtraction

VERS,

Versus

Measure Subsystem

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ALL, CURS, Cursor

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.,.3-l

..3-17

...3-2

3-14 3-15 3-15 3-16 3-16 3-16 3-16

3-17

3-18 3-19 3-19 3-20 3-2 1

3-22 3-23 3-24 3-25 3-26 3-26 3-26 3-27

3-27 3-28 3-28 3-28 3-29 3-31 3-31 3-32 3-32 3-33 3-33 3-34 3-35 3-36 3-37 3-39

3-39

3-40 3-40

1 3-41 3-42 3-42 3-43 3-49 3-49

CONTENTS, Continued

DUT, Duty Cycle. ESTA, Start Marker Edge Number

ESTO,

Stop Marker Edge Number

FALL, Fall Time

F.REQ,Frequency

LOW, Lower Threshold MODE

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NWID, Negative Pulse Width OVER, Overshoot PER, Period

PREC, Precision PRES, Preshoot PTIM, Preceding Point of Requested Time PVOL, Point of Specified Voltage/Intersection PWID, Positive Pulse Width

RISE, Rise Time. SOUR, Source

TDEL, Time Marker Delta

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TMAX, Time of First Occurrence of Maximum Voltage TMIN, Time of First Occurrence of Minimum Voltage TPO, Time of Specified Point TSTA, Time of Start Marker TSTO, Time of Stop Marker TTIM, Time of REC Trigger Event TVOL, Time of Specified Voltage/Intersection UNIT, Units

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UPP, Upper Threshold VAMP, Signal Amplitude VAV, Signal Average

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VBAS, Waveform Base Voltage Level VDEL, Voltage Marker

‘Delta VFIF, Voltage Markers to

VMAX, Maximum Voltage of Signal

VMIN, Minimum Voltage of Signal

VPO, Voltage of Specified Point VPP, Signal Voltage Peak-to-Peak VREL, Relative Voltage Marker Positioning

VRMS, RMS VSTA,

Position of Voltage Marker

VSTO,

Position of Voltage Marker 2

VTIM,

Voltage of Specified Time

VTOP,

Top Voltage Level

Timebase

DEL, Delay

Voltage

Subsystem

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DELT, REC Delta Time EVEN, INT,

Interpolation MODE RANG, REF,

Reference

Event

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Range.

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50%

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‘1

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Status

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3-49 3-50

3-50 3-51

3-51 3-51

3-52 3-53 3-53 3-54 3-54 3-54 3-55 3-55 3-56 3-56 3-57

3-57 3-57

3-58 3-58 3-58 3-59 3-59 3-59

3-60

3-61

3-62 3-62

3-62 3-63

3-63

3-63 3-64 3-64

3-64 3-65

3-65

3-66 3-66

3-66 3-67 3-70 3-70 3-71 3-71 3-72 3-72

3-73

CONTENTS, Continued

SAMP,Sample.............................................3-7

SWIT, Switch Magnify Subsystem

Trigger Subsystem .

CENT, Center . . DEL, Delay . . . HOLD,

Holdoff

HYST, Hysteresis

LEV, Level . . . .

QUAL, Qualifier SOUR, Source . . TOUT, Timeout .

Waveform Subsystem

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DATA ..................................................

FORM, Format POIN, Points PRE, Preamble SOUR, Source TYPE

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VAL, Valid XINC, X Increment XOR, X Origin XREF, X Reference YBOT, Bottom Reference Value YINC, Y Increment YOR, Y Origin YREF, Y Reference YTOP, Top Reference Value

Window Subsystem

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TYPE ..................................................

3 3-74 3-74 3-77 3-79 3-79 3-80

3-80

3-81 3-81 3-82 3-83 3-84 3-84

3-86 3-86 3-87 3-87 3-88 3-88 3-88 3-89 3-89 3-89

3-90

3-91 3-92 3-93

Appendices

Appendix A, Command Listing by Subsystem Appendix B, Alphabetical Mnemonic Listing Appendix C, Alphabetical Command Description Listing Appendix D, Alphabetical Command Summary Appendix E, HP-IB Review

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A-l

B-l C-l D-l

E-l

Vii

LIST OF ILLUSTRATIONS

Figure Title

l-l. Multiple-Channel Digitizer System l-2. HP 70700A Digitizer Front Panel l-3. HP 70700A Digitizer Rear Panel

1. Multiple-Channel Digitizer System Addressing 2-2. HP 70700A Digitizer Address Switches 2-3. Status Data Structure 2-4. Status Byte Register 2-5. Service Request Enable Register 2-6. Standard Event Status Register 2-7. Output Queue 2-8. Timing Diagram without a Synchronization Command 2-9. Timing Diagram Using a Synchronization Command

2-10.

Remote Slaving Procedure Diagram 2-11. Remote Slaving Procedure Diagram for Random Event Capture 3-1. Terminated Program Message Functional Element Syntax 3-2. <PROGRAM MESSAGE UNIT> Functional Element Syntax 3-3. <COMMAND/QUERY MESSAGE UNIT> Functional Element Syntax 3-4. <PROGRAM MESSAGE UNIT SEPARATOR> Syntax 3-5. <PROGRAM HEADER SEPARATOR> Syntax 3-6. <PROGRAM DATA SEPARATOR> Syntax 3-7. Common Command Set Commands 3-8. Digitizer Top-Level Command Set Commands 3-9. Acquire Subsystem Commands

3-10.

Calibration Subsystem Commands 3-l1. Channel Subsystem Commands 3-12. Display Subsystem Commands 3-l3. Domain Subsystem Commands 3-14. Function Subsystem Commands 3-l5. Measure Subsystem Commands 3-16. Timebase Subsystem Commands 3-17. Trigger Subsystem Commands

3-18.

Waveform Subsystem Commands

3-19.

Window Subsystem Commands

E-l. HP-IB Connector . E-2. HP-IB Structure

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Page No.

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l-2 l-4

1-5

2-3 2-3

2-10 2-11 2-12 2-14 2-17 2-18 2-19 2-28 2-35

3-3 3-3 3-3 3-5 3-5

3-5

3-8

3-14 3-18

3-2

3-23 3-29 3-35 3-37 3-44 3-67 3-77 3-84 3-92

E-l E-2

HP 70000 MODULAR MEASUREMENT SYSTEM

DOCUMENTATION OUTLINE

Instruments and modules of the HP 70000 Modular Measurement System are documented to varying levels of detail. Modules that serve as masters of an instrument require operation information in addition to installation and verification instructions. Modules that function as slaves in a system require only a subset of installation and verification information. Service 70000 Modular Measurement System family.

docuinentation

USER MANUALS, SUPPLIED WITH MODULE

Installation and Verification Manual

Topics covered by this manual include installation, specifications, verification of module operation, and some troubleshooting techniques. Manuals for modules that serve as instrument masters will supply information in all these areas; manuals for slave modules will contain only information needed for slave module installation and verification. Master module documentation may also include some system-level information.

availa’ble

for every module of the HP

Operation Manual

Information in this manual usually pertains to multiple- and single-module instrument systems. The

Operation Manual describes manual operation of the module, with explanations of

softkeys and their use.

Programming Manual

Information in this manual usually pertains to multiple- and single-module instrument systems. The Programming Manual defines commands that enable remote operation of the module, and describes remote

command syntax.

SERVICE MANUAL, AVAILABLE SEPARATELY

Technical Reference

This manual provides service information for a module, including performance verification, adjustments, troubleshooting, replaceable parts lists, replacement procedures, diagrams. For ordering information, contact an HP Sales and Service Office.

schematics, and component location

GENERAL INFORMATION

Chapter

GENERAL INFORMATION

HOW TO USE THIS MANUAL

The HP 70700A Digitizer Programming Manual describes how to operate a digitizer system by remote,

computer control. It is not necessary to read this manual from cover to cover; however, it may be useful to

note what is in each chapter. Chapter 1, General Information, provides descriptions of the digitizer system, the HP 70700A Digitizer

module, and front- and rear-panel features of an HP 70700A Digitizer module.

Before any remote operations are performed with your digitizer system, it must first be installed and configured properly. Refer to the HP 70700A Digitizer Installation and Verification Manual for detailed instructions on correct installation and configuration information.

Chapter 2, Programming Fundamentals, provides information on the following topics: installation for

remote operation, communication with the system, the Status Reporting Structure, synchronization of events and commands, and data transfer. Information on multiple-digitizer remote slaving is also included in this chapter.

Chapter

functional subsystem, including syntax diagrams and functional parameters.

Appendices consist of four cross-reference listings and/or summaries for the digitizer remote commands, and a general overview of the Hewlett-Packard Interface Bus (HP-IB):

A single-channel digitizer system consists of an HP 70700A Digitizer master module, an HP 70205A or HP 70206A Display, and an HP 70001A Mainframe. Additional digitizer modules may be slaved to the master module to provide a multiple-channel digitizer system. See Figure l-l.

The digitizer system measures repetitive or transient waveforms with improved accuracy, resolution, and dynamic range over other measurement techniques. With the use of the internal analog-to-digital converter

Language Reference, provides a complete, detailed description of each command within each

Appendix A Command Listing by Subsystem Appendix B Alphabetical Mnemonic Listing Appendix C Appendix D Alphabetical Command Summary Appendix E HP-IB Review

Alphabetical Command Description Listing

l-l

GENERAL INFORMATION

(ADC) combined with digital memory, a computer can be used to analyze the data, and allowing automation. Simultaneous digitization and memory access are available (i.e., as data is being measured, the results may be accessed immediately with the use of a controller). Multi-channel operation may be achieved by slaving multiple digitizer modules together, synchronized by the master digitizer module “clock out” and “sync out” signals.

Data is always digitized at a 20 MHz rate and then a digital detection algorithm is applied to “reduce” the data before it is stored. The four detection modes that are available for selection are sample, peak, pit, and alternate.

Interpolation may be used to provide a better visual display of high-frequency waveforms.

with the slave digitizer module

ny”

broviding better results

lllcvll

HEWLETT

Ei!!iia

LIE 0 or Pl

The digitizer system has triggering capabilities which are especially necessary when measuring transient waveforms. These triggering capabilities are the functions of EITHER EDGE, ABOVE BELOW LEVEL, or OUTSIDE RANGE. Additionally, hysteresis may be used to adapt the triggering to match the input signal.

The Random Event Capture mode retains up to 1000 trigger events of a measurement with a guaranteed amount of pre- and post-trigger data for each event. There is no dead time between events, the time of the event is always stored, and the event time may be queried data. The memory is dual ported so that captured events may be examined while the measurement is still proceeding.

The Equivalent Time Sampling mode provides a technique for looking at stable, periodic, repetitive signals by using multiple trigger events to form a composite waveform. It will allow than 10 ns.

PACKARD

AIRFLOW

Figure l-l. Multiple-Channel Digitizer System

tYom :1

controller without outputting the event

70001A MAINFRAME

riseitime measurements of less

70000 SYSTEMS/

singleshot

LEVEL,,

1-2

GENERAL INFORMATION

HP 70700A DIGITIZER MODULE OVERVIEW

The HP 70700A Digitizer is a l/8-module with a 20 MHz sampling rate designed to work in an HP 70000 Series mainframe. It has both HP-IB (Hewlett-Packard Interface Bus) and HP-MSIB (Hewlett-Packard Modular System Interface Bus) communication capabilities. The HP 70700A Digitizer can function in the following configurations:

l Single-channel digitizer system (consisting of one module)

l Multiple-channel digitizer system (with one HP 70700A Digitizer functioning as a master to other HP

70700A Digitizer modules)

l Slave to an HP 70900A Local Oscillator when configured in an HP

70000

Series Modular Spectrum

Analyzer System

l Single-channel digitizer instrument configured with an HP 70000 Series Modular Spectrum Analyzer

System (When the HP 70700A Digitizer is used in this configuration, it is not a slave of the spectrum analyzer but is used to view the spectrum analyzer video output.)

The last configuration described above is essentially the same as a single-channel digitizer system. The disadvantage of this configuration is that the spectrum analyzer and digitizer operate independently, so sweep-time coupling and amplitude calibration are lost. However, the advantage of this configuration is that it allows all the digitizer features, such as the Measure ALL function and the Random Event Capture mode, to operate on the video output of the spectrum analyzer. Refer to the HP 70700A Digitizer Installation and Verification Manual for diagrams of correct digitizer system configurations.

LED Indicators

1. STATUS ACT indicates that the HP 70700A Digitizer is active. The ACTIVE LED lights when: a. the keyboard of the display is allocated to the digitizer.

b. any Display function indicates the digitizer (e.g., when the cursor of the Display Address Map is at

the HP-MSIB address of the digitizer).

c. a digitizer is a slave to another digitizer that is designated as a master module, and it is being used by

that master digitizer.

2. STATUS ERR indicates errors. (Refer to Chapter 5, Troubleshooting, in the HP 70700A Digitizer Installation and Verification Manual.)

3. HP-IB RMT indicates that the module is being remotely controlled and local control is disabled.

4. HP-IB LSN indicates a state in which the module is ready to accept information from the controller.

I-3

GENERAL INFORMATION

’ 707OOA bTE

DIGITIZEF

Mmnplor/rr

FRONT-

\ PANEL

BNC

INPUT

MODULE

LATCH

Figure 1-2. HP 70700A Digitizer Front Pmel

5. HP-IB TLK indicates a state in which the module is

6. HP-IB SRQ indicates a condition requested or set by the user (e.g., errors, operation complete status, power-on condition). Refer to Chapter 2, Programming Fundamentals, for more information on the Service Request LED and the Standard Status Data

7. MEASURE indicates that the module is making a measurement.

INPUTS

INPUT 1 (type BNC connector) can be utilized only when the HP 70700A Digitizer is used in a digitizer system. Refer to Table 1-l for more information about input selection and input impedance.

MODULE LATCH

The module hex-nut latch is used for installing the module in an HP 70000 Series mainframe. An 8 mm hex-ball driver is required to turn the hex-nut latch.

reads

to send information to the controller.

StruCture.

1-4

GENERAL INFORMATION

Table l-l. HP 70700A Digitizer Input Selection and Input Impedance

HP 70700A Digitizer used in a digitizer system, or as a digitizer instrument in a non-digitizer system:

HP 70700A

Preset Input

Softkey-Selected Input

Preset Input Impedance

Softkey-Selected Input Impedance

HP 70700A Digitizer used as a slave to a non-digitizer master:

Preset Input

Softkey-Selected Input

Preset Input Impedance

Softkey-Selected Input Impedance

DC Coupled I MR

AC Coupled

or DC Coupled

DC Coupled 1

DIGITIZER REAR-PANEL FEATURES

INPUT

INPUT 2

none

lf2,

5Of2

MSZ

Figure 1-3. HP 70700A Digitizer Rear Panel

1-5

GENERAL INFORMATION

Rear-Panel SMB Connectors

1. HI SWP (High Sweep) is an input/output that is connected to HSWP of the HP 70900A Local Oscillator when an HP 70700A Digitizer is used as a slave to an HP 70900A Local Oscillator in a spectrum analyzer

system. This connection is necessary to synchronize the digitizer and local oscillator and their starting and stopping of measurements.

2. CLK OUT (Clock Out) provides a TTL-level 20 MHz clock output. In a single-channel digitizer system, the CLK OUT is connected to the CLK IN on the same module. In a multiple-channel digitizer system, the CLK OUT of the master HP 70700A Digitizer module must be connected to both its own CLK IN and the CLK IN of all of its slaves. (Refer to the HP 70700A Digitizer Installation and Verification Manual, Chapter 2, for detailed instructions on correct installation and configuration information.)

3. CLK IN (Clock In) requires a 50% duty cycle, TTL-level clock input with a 10 MHz to 20 MHz frequency. (See CLK OUT, above.)

4. INPUT I can be utilized only when the HP- 70700A Digitizer is used in a digitizer system. The front-panel INPUT 1 and rear-panel INPUT 1 are connected together and are electrically the same. Refer to Table 1-I for more information about input selection and input impedance.

5. INPUT 2 can be utilized when the HP 70700A Digitizer is used in any type of configuration. When the HP 70700A Digitizer is used in a digitizer system, INPUT 2 is preset “open” (i.e., no connection). Refer to Table l-l for more information about input selection and input impedance.

6. EXT TRIG (External Trigger) allows an external input signal to be used to trigger the digitizer module externally. The input signal must be TTL with a pulse width of’ at least one clock period, typically 50 ns. (See SYNC OUT, below.)

7. SYNC OUT (Synchronizing Output) provides a TTL-level signal used to svnchronize the ‘HP 70700A Digitizer slave modules of a multiple-channel digitizer system. In a multiple-channel digitizer system, the SYNC OUT of the master HP 70700A Digitizer must be connected to the EXT TRIG inputs of the HP 70700A Digitizer slave modules. (Refer to the HP 70700A Digitizer Installation and Verification Manual, Chapter 2, for detailed instructions on correct installation and configuration information.)

MAINFRAME/MODULE INTERCONNECT

The mainframe provides the power supply, HP-MSIB connections, and HP-IB connections for the HP 70700A Digitizer module through this mainframe/module interconnect.

l-6

PROGRAMMING FUNDAMENTALS

Chapter 2

PROGRAMMING FUNDAMENTALS

This chapter provides the information necessary to operate a digitizer system via a computer. The topics covered in this chapter are listed below:

Setup Procedures for Remote Operation

Address Switches

. Communication with the System

Status Reporting Structure

Synchronization of Events and Commands

Data Transfer

l Multiple-Digitizer Remote Slaving Procedure

2-1

PROGRAMMING FUNDAMENTALS

The following procedure describes how to connect your equipment for remote operation of a digitizer system.

NOTE

Refer to the HP 70700A Digitizer Installation and Verification Manual for more detailed and specific information on installation, configuration, and addressing of digitizer systems.

1. Connect computer, digitizer system, and other peripherals with HP-IB cables.

2. After the HP-IB cables are installed, reset all instruments connected to the bus. (If you are not sure how to reset a device, switch its line power off, then on, to reset it.)

3. Check the HP-IB address of the master digitizer module on the address map. To view the address map,

press the [DISPLAY]

RPG knob on the front panel of the display until the first digitizer module appears in the address map.

key on the display

front

panel,

then press the ~~~~~~~~~~~~~~~~

. . . . . . . .

:...:::.::.:.....:..:::.::::::.,.:.,..:...:::

,.....,.,..,,........,.....,...........................

softkey.

Turn the

The master digitizer module must be located in row 0 for HP-IB access and error-reporting capabilities.

4. Check the system configuration on the address map. For single-channel digitizer system operation, the digitizer and display modules must be positioned in the bottom row (row. 0) of the address map. For multi-channel digitizer systems, the other digitizer modules must be positioned either in the same column as the master digitizer above row 0, or in any other higher-address column above row 0 of the master module. For more information on multi-channel system configurations, refer to Digitizer Channel Number Assignment, below.

DIGITIZER CHANNEL NUMBER ASSIGNMENT

The channel number assignment of a digitizer system is determined by addressing. The master digitizer, located at row 0, will always be assigned as CHANNEL 1. The next HP 70700A Digitizer encountered by the master in its search will be assigned as CHANNEL 2. This process continues until all of the channels have been assigned, or until all of the HP 70700A Digitizers have been assigned channels. The sequence in which the Address Map is searched is from bottom to top and left to right. A maximum of four channels are available when a digitizer system is controlled from a display front panel. A maximum of eight channels

are available when the system is controlled by a computer.

Figure 2-1 displays the address map of a four-channel digitizer system. Note that the master digitizer

module is CHANNEL 1 and that it is located in row 0. The other three digitizers (or Channels) are defined

by their address positions.

2-2

CHANNEL 2

MASTER CHANNEL 1

PROGRAMMING FUNDAMENTALS

ADDRESSING EXAMPLE

70700A

DIGITIZER-\

70700A .

DltNTIZER \

CHANNEL

CHANNEL 3

COLUMN

Figure 2-l. Multiple-Channel Digitizer System Addressing

PROGRAMMING FUNDAMENTALS

ADDRESS SWITCHES

Address switches set the HP-MSIB address of an element (module); the column address switches also set the HP-IB address for masters and independent elements. Some master elements can also have their HP-IB address set through the use of softkeys (i.e., soft-set address).

The hard address switches for the digitizer are located on the top of the module.

HP-IB address 31 is an Illegal address and should not be used.

Descriptions of the HP 70700A Digitizer address switches are given below.

HP-IB ON-OFF When this is set to OFF, the HP 70700A Digitizer is switched off the HP-IB. Column ADDRESS Switches l-5 These set the HP-MSIB column address, which is also the HP-IB address. Row ADDRESS Switches l-3 These set the HP-MSIB row address.

ADDRESS

HP-18

ROW

ADDRESS

SWITCHES

Figure

’ COLUMN

ADDRESS

SWITCHES

2-2.

HP 70700A Digitizer Address Switches

OFF

SOFT-SET HP-IB ADDRESSES

The HP-IB address of the digitizer master module may be changed from the front panel of the display. The soft-set address remains in effect until the hard address switches are changed and power is cycled, or until another soft-set address is entered. At power-up, the soft-set address will override the hard address switch settings.

NOTE

PROGRAMMING FUNDA.MENTALS

Changing the HP-IB address via the display front

panel

does not affect the

position of the modules on the address map.

Use the following procedure to enter a soft-set HP-IB address.

1. Press the [DISPLAY] key on the display front panel.

.....

When the display Main Menu appears, press the #&?fl~~$ii$!##! softkey.

;~...~~.........~~~~~.

When the next

Enter the new HP-IB address using the numeric keys on the display front panel.

press $e&~@g*

. . . . . . . . . . . . . . . . . . . . . . ..s

. . . . . . . . ..I..............

menu appears, press ~~~;~~~~~~~~~~.

. .

...

.......

. .. . . . ...

:.i:

.............................................

..::......:..::i.::.:....i:..:::

.......................................................

:..;....:.::::...::

...

.............. .....

.:::::: ':: ;'*':.' ::::::..::...::...:::

2-5

PROGRAMMING FUNDAMENTALS

COMMUNICATION WITH THE SYSTEM

This section develops some fundamental techniques for controlling the digitizer and obtaining sound measurement results. Remote operation of the digitizer is controlled with commands that correspond in general to front-panel

It is important to understand how messages are communicated to the digitizer; therefore, enter and output statements and command syntax discussed in this section should be understood before proceeding. It should be noted that HP BASIC is used for all examples in this manual.

Digitizer programs control the passage of digitizer commands and data between the digitizer and the

computer on the Hewlett-Packard Interface Bus (HP-IB), using HP BASIC OUTPUT and ENTER statements. An OUTPUT statement tells the computer to send a message to the digitizer. For example, executing the

output statement below sets the time range to 10

softkey

functions.

MS:

OUTPUT

COMPUTER SEND MESSAGE

HP-IB SELECT CODE

DIGITIZER ADDRESS

ACTIVATE TIME RANGE

SET TIME RANGE VALUE

COMMAND SEPARATOR

An ENTER statement used in conjunction with a digitizer query returns information to the computer. To return the time range value to the computer, first form a query by adding a question mark (?) to the command:

707;“TIM:RANG

lOus;

2-6

PROGRAMMING FUNDAMENTALS

OUTPUT

TIME RANGE

ACTIVATE QUERY

COMMAND

Next, the enter statement can be used to assign the

SEPARATOR

ENTER

COMPUTER RECEIVE MESSAGE

707;“TIM:RANG?;”

ret-wned

value to a variable in the computer:

707;Range

HP-18

SELECT CODE

DIGITIZER ADDRESS

COMPUTER VARIABLE

The value of the time range above is equated to the computer variable “Range”. The variable may be

printed, stored, or used for any other computer function.

Syntax Requirements

All of the program examples in this manual show recommended command syntax. All digitizer commands must be constructed according to specific syntactical rules which are outlined in Chapter 3, Language Reference. The Language Reference lists all of the remote digitizer commands in alphabetical order

according to each functional group subsystem, and contains a syntax diagram for each subsystem.

Local and Remote Control

Whenever the digitizer is remotely addressed, the display front-panel softkeys are disabled. Pressing the

[LOCAL] key or executing the HP BASIC command “LOCAL” reenables operation of the softkeys.

2-7

PROGRAMMING FUNDAMENTALS

INITIAL PROGRAM CONSIDERATIONS

Programs should begin with a series of HP BASIC and digitizer commands that form a good starting point for digitizer measurements. The following example shows how to initialize the digitizer to form a good starting point.

10 ASSIGN @DIG to 707 20 CLEAR @DIG 30 OUTPUT @DIG;"*RST;TIM:MODE ASIN;RUN;"

The ASSIGN command is an HP BASIC command that creates an I/O path name and assigns that name to an I/O resource. In the example above, the I/O path name is address 7. (Note: all program examples in this manual assume that the digitizer is addressed at HP-IB address

707.)

The ASSlGN command offers several advantages when included in a digitizer program. For example, the digitizer address is easily changed in the computer program and the program can transfer data to a mass

storage unit.

The RESET command, *RST, presets all of the analog parameters of the digitizer and provides a good starting point for all measurement processes. Executing *RST is actually the same as executing a number of digitizer commands that set the digitizer to a known state.

“@DIG”

and is assigned to the device at HP-IB

The CLEAR command is an HP BASIC command that clears the input buffer, the output buffer, and the command parser of the specified instrument; that is, a device on HP-IB is “cleared” so that it is ready for operation. This command may be used to clear devices on the bus singly or in unison. It is often desirable to reset only one instrument so that other instruments on the bus are not affected.

To clear the digitizer, the “CLEAR @DIG” statement may be entered into the computer.

To clear all devices at select code 7, the “CLEAR 7” statement may be entered into the computer.

2-8

PROGRAMMING FUNDAMENTALS

This section describes and defines the status reporting structure used in the HP 70700A Digitizer. In general, the status data structure is used to “request service” or indicate a specific condition (e.g., operation complete) via SRQ (Service Request). This structure may be used to alert the user that certain events have occurred without the user’s actually initiating a request for this information. Refer to Figure 2-3 for a model of the status data structure.

Each of the integral parts of the status data structure are described below in more detail.

The Status Byte Register contains the device’s Status Byte (STB) summary messages, Request Service (RQS) messages, and Master Summary Status (MSS) messages. See Figure 2-4.

The Status Byte Register can be read with either a serial poll or the READ STATUS BYTE common query

(*STB?).

6 position depends on the method used.

Both of these methods read the status byte message identically. However, the value sent for the bit

When the Status Byte Register is read with a serial poll “SPOLL status byte message plus the single-bit RQS message to the

When the Status Byte Register is read with the *STB? common qu

byte message plus the single-bit MSS message as a single <NRI NUMERIC PROGRAM DATA> element. The response to *STB? is identical to the response to a serial poll except that the MSS summary message appears in the bit 6 position in place of the RQS message. The MSS summary message indicates that the device has at least one reason for requesting service.

Standard Event Status Bit (ESB) Summary Message

The ESB summary message is a defined message which appears in bit 5 of the Status Byte Register. Its state indicates whether or not one or more of the enabled events have occurred since the last reading or clearing of the Standard Event Status Register. Refer to Figure 2-3.

The ESB summary message is TRUE when an enabled event in the Standard Event Status Register is set TRUE. Conversely, the ESB summary message is FALSE when no enabled events are TRUE.

Message Available (MAV) Queue Summary Message

The MAV summary message is a defined message which appears in bit 4 of the Status Byte Register. The state of the message indicates whether or not the Output Queue is empty. Whenever the device is ready to accept a request by the controller to output data bytes, the MAV summary message shall be TRUE. The MAV summary message shall be FALSE when the Output Queue is empty. Refer to Figure 2-3.

controll

(@DIG)“, the device returns the seven-bit

er as a single data byte.

ery, the device returns the seven-bit status

2-9

PROGRAMMING FUNDAMENTALS

*ESR?

Standard

Status

*ESE

. . . . . . . . .

. ..**..a.

bbob*

, . . . . . . . .

l .

b b

b b b b

b b b

l l

. . . . . .

-J

. . . . . . . . .

. . . . . . . .

, . . . . . . . .

. . . . l . . . .

. . . . . . . . .

..*.

. . . . . . . . . . . . .

. . . . . . . .

7 6

.q..

. .

&RQS’ : I I

ESBMAV

,MSS

. . .

. . . . . . . .

..,............,.......

. .

3 2

*ESE?

1 0

Event!

Enable

<nrf>

Ser Ena

: i

Serial Poll

tatus egister

-read by

vice ble Register

output

Queue

read by

*STB?

*SRE

<nrf>

*SRE?

Byte

Request

2-10

Figure

2-3.

Status

Data

Structure

PROGRAMMING FUNDAMENTALS

The MAV summary message is used to synchronize information exchange with the controller. The controller can, for example, send a query command to the device and then wait for MAV to become TRUE. The system bus is available for other use while an application program is waiting for a device to respond. If an application program begins a read operation of the Output Queue without first checking for MAV, all system bus activity is held up until the device responds.

NOTE

Bits 0 through 3 and bit 7 are not used at this time.

- - - w w SUMMARY - - - w - -

0107

Clearing the Status Byte Register

STATUS

MESSAGES

RQS

ES6

MSS

MAV

0106

0105

3 2

0104

0103

Figure 2-4. Status Byte Register

The CLEAR STATUS

(*CLS)

common command causes the Event Registers and Queues of the status data structure to be cleared so that the corresponding summary messages are clear. The Output Queue and its MAV summary message are an exception and are unaffected by

*CLS.

SERVICE REQUEST ENABLE REGISTER

The Service Request Enable Register is an eight-bit register that can be used by the programmer to select which summary messages in the Status Byte Register may cause service requests. The programmer may select reasons for the device to issue a service request by altering the contents of the Service Request Enable Register. Refer to Figure 2-5.

PROGRAMMING- FUNDAMENTALS

w--N

STATUS

SUMMARY - -

MESSAGES

..,....

........

................

........................

l ,ObO

)

RQS

MSS,

ESB

,, Y

7x5432

MAV

(

. .

3erial

Status

Resister

l **

Service Enable

read by

rkad

*STB?

Regi’st

*SRE

*SRE?

Pol I

Byt

Request

<nrf>

Figure 2-5. Service Request Enable Register

Reading/Writing the Service Request Enable Register

The Service Request Enable Register is read with the SERVICE REQUEST ENABLE (*SRE?) common query. The response message to this query is a represents the sum of the binary-weighted values of the Service Request Enable Register (2 raised to the power of the bit number). The value of unused bit 6 is always zero.

The Service Request Enable Register is written to with the SERVICE REQUEST ENABLE command followed by a <DECIMAL NUMERIC PROGRAM DATA> element. The <DECIMAL NUMERIC PROGRAM DATA>, when rounded to an integer value and expressed in base two (binary), represents the bit values of the Service Request Enable Register. A bit value of one indicates an enabled condition. A bit value of zero indicates a disabled condition.

The device always ignores the value of bit 6.

2-12

<NRl

NOTE

NUMERIC PROGRAM DATA> element that

(*SRE)

common

PROGRAMMING FUNDAMENTALS

Service Request Generation

The Service Request function provides the device with the ability to request service from the controller via the Service Request interface (SRQ, a line on HP-IB), and report that it has requested service via the Request Service message (RQS, bit 6 of the Status Byte Register).

The generation of service requests ensures that the device shall:

1. Assert an SRQ when a previously “enabled” condition occurs.

2. Keep SRQ asserted until the controller has recognized the service request and polled the device, or has taken specific action to cancel the request (e.g., *CLS command).

3. Release SRQ when polled so that the controller can detect an SRQ from another device.

4. Assert an SRQ again if another condition occurs, whether or not the controller has cleared the first

condition. If the previous condition has not been cleared, the next condition must be different than the first for an SRQ to be asserted again.

Whenever the contents of the Status Byte Register or the Service Request Enable Register are changed, the

device must determine whether the change affects the service request state of the device. Device status

transitions do not affect the state of the SRQ interface directly. Instead, changes to the Status Byte Register and the Service Request Enable Register generate two local messages which either assert (Request Service TRUE) or unassert (Request Service FALSE) the hardware.

The device shall generate a new service request (assert Request Service TRUE) when:

1. A bit in the Status Byte Register changes from FALSE to TRUE while the corresponding bit in the Service Request Enable Register is TRUE.

2. A bit in the Service Request Enable Register changes from FALSE to TRUE corresponding bit in the Status Byte Register is TRUE.

3. A bit in the Status Byte Register changes from FALSE to TRUE and the corresponding bit Service Request Enable Register changes from FALSE to TRUE simultaneously.

In general, the controller application program must never assume that an SRQ indicates that a new Il eason for service has occurred, but only that it may have occurred. The application program should check the device Status Byte Register to determine whether it is indeed the case that a new reason for service exists.

Clearing the Service Request Enable Register

The SERVICE REQUEST ENABLE (*SRE) common command followed with a <DECIMAL NUMERIC

PROGRAM DATA> element value of zero clears the Service Request Enable Register. A cleared register does not allow status information to generate a hardware Request Service message; thus, no service requests are issued.

whil

e the in the

The Standard Event Status Register structure has specific, defined events assigned to specific bits. Refer to Figure 2-6.

2-13

PROGRAMMING FUNDAMENTALS

Sumary

Event

(BIT 5 OF STATUS BYTE REGISTER)

Sumary

Message

Bit

(ESB)

Standard

Status

*ESR?

Standard

Status

*ESE <nrf>

*ESE?

Enable

Event

Figure 2-6.

Bits 7 through

Bit 7 - Power On (PON) This event bit indicates that an off-to-on transition has occurred in the power

supply of the device.

Bit 6 - User Request

Bit 5 - Command Error (CME)

1. A syntax error (controller-to-device message) has been detected. element which violates the device listening formats or whose type is unacceptable to the device.

2-14

(URQ)

This event bit is not used at this time.

This event bit indicates that one of the following events has occurred:

Sfmdard

.Ehent

Status Register

Possible errors include a data

+ 164 hidden pages

Agilent 70700A Programmers Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

WARRANTY

SAFETY SYMBOLS

CONTENTS

USER MANUALS, SUPPLIED WITH MODULE

Installation and Verification Manual

Operation Manual

Programming Manual

SERVICE MANUAL, AVAILABLE SEPARATELY

Technical Reference

GENERAL INFORMATION

HOW TO USE THIS MANUAL

HP 70700A DIGITIZER MODULE OVERVIEW

MAINFRAME/MODULE INTERCONNECT

PROGRAMMING FUNDAMENTALS

DIGITIZER CHANNEL NUMBER ASSIGNMENT

ADDRESS SWITCHES

SOFT-SET HP-IB ADDRESSES

COMMUNICATION WITH THE SYSTEM

INITIAL PROGRAM CONSIDERATIONS

SERVICE REQUEST ENABLE REGISTER