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54622-97038编程和语法指南.pdf
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详细说明：安捷伦示波器54622-97038编程和语法指南Capture
Once you initialize the oscilloscope, you can begin capturing data. for
analysis. Remember that while the oscilloscope is responding to
commands from the controller, it is not performing acquisitions. Also
when you change the oscilloscope configuration, any data already
captured will most likely be rendered
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 oscilloscope, and the captured data can be measured
stored in trace memory in the oscilloscope, 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 put the oscilloscope into run mode, then use a wait loop
in your program to ensure that the oscilloscope has completed at least
one acquisition before you make a measurement. agilent 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 oscilloscope has completed an acquisition you can find out
more about the data, either by using the oscilloscope measurements or
by transferring the data to the controller for manipulation by your
program. Built-in measurements include frequency, duty cycle, period
and positive and negative pulse width
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
This Programmer's Guide is your introduction to programming the
oscilloscope using an instrument controller. This book, with the Programmer's
Reference, provides a comprehensive description of the oscilloscope's
prograItullalic interface. The Progrurrmer's Reference is supplied as a
Microsoft, Windows help file on a 3.5 diskette
The oscilloscope has a built-in rs-232-C port for programming To program the
oscilloscope over gpib, you need the n2757A GPiB interface Module. You also
need an instrument controller that supports either the IEEE-488 or RS-232-C
interface standards, and a programming language capable of communicating
with these interface
This book contains the following information
Chapter 1 Introduction to Programming gives a general overview of
oscilloscope prograiulling
Chapter 2 Programming Getting Started, shows a simple program, explains
its operation, and discusses considerations for data types
Chapter 3 GPib, discusses the general considerations for programming the
inistrument over all gPib interlace
Chapter 4 Programming over rs-232-C, discusses the general considerations
for programming the instrument over an Rs-232-C interface
Chapter 5 Programming and Documentation Conventions, describes the
conventions usedinrepresenlinig the syntAx ofcolmiallds throughout this book
and the Programmers Reference, and gives an overview of the oscilloscope
command set
Chapter 6 Status Reporting, discusses the oscilloscope status registers and
how to use them in your programs
Chapter 7 Installing and Using the Programmer's Reference, tells how to
install the Programmer's reference online help file in Microsoft Windows, and
explains help file navigation
Chapter 8 Programmers Quick Reference, lists all the commands and queries
available for programming the oscilloscope
For information on oscilloscope operation, see the User's Guide For
informalion on interface conliguralioI, see the docuinlentalion lor the
oscilloscope interface module and the interface card used in your controller( for
example, the Agilent 82350A interface for IBM PC-compatible computers)
Contents
I Introduction to Programming
Talking to the Instrument 1-3
Program Message Syntax 1-4
Combining Commands from the Same Subsystem 1-7
Duplicate mnemonics 1-8
Query Command 1-9
Program Header Options 1-10
Program Data Syntax Rules l-ll
Program Message Te
r1-13
Selecting Multiple subsystems 1-14
2 Programming Getting Started
Initialization 2-3
Autoscale 2-4
Setting Up the Instrument 2-5
Example Program 2-6
Using the Digitize Command 2-7
Receiving Information from the Instrument 2-9
String variables 2-10
Numeric variables 2-11
Definite-Length Block Response Data 2-12
Multiple Queries 2-13
Instrument status 2-13
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
Minimum three-Wire interface with software protocol 4-4
Extended Interface with hardware handshake 4-5
Configuring the Interface 4-6
Interface Capabilities 4-7
Lockout command 4-8
Contents -1
5 Programming and Documentation Conventions
Co
d Set, Organization 5-8
The Command Tree 5-6
Obsolete and discontinued Commands 5-10
Truncation rules 5-15
Infinity representation 5-16
Sequential and overlapped commands 5-16
Response Generation 5-16
Notation conventions and definitions 5-17
Program Examples 5-18
6 Status Reporting
Status Reporting Data Structures 6-5
Status Byte Register (sBr)6-8
Service Request Enable Register (SrER)6-10
Trigger Event Register (trg)6-10
Standard Event status Register(sesr)6-11
Standard event status Enable Register (seser) 6-12
Operation Status Register (OPR)6-13
Arm Event Register(arm) 6-13
Error Queue 6-14
Output queue 6-15
Message Queue 6-15
Clearing Registers and queues 6-15
7 Installing and Using the Programmers 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 7-5
8 Programmer's Quick Reference
C
ntions 8-3
Suffix Multipliers 8-3
CoIlLmlands and Queries 8-4
Contents-2
Introduction to Programming
Introduction to Programming
Chapters l and 2 introduce the basics for remote programming of an
oScilloscope. The programming instructions in this manual conform to
the IEEE488.2 Standard Digital Interface for Programmable
Instrumentation. The programming instructions provide the means of
remote control
To program the oscilloscope you must add either a GPIb (N2757A)
interlace, or program over the built-in rs-232-C interlace on the rear
panel
You can perform the following basic operations with a controller and an
oScilloscope
Set up the instrument
Make measurements
Acquire data (waveform, measurements, configuration from the
oscilloscope
Send information(pixel images, configurations) to the oscilloscope
Other tasks are accomplished by combining these basic functions
Languages for Program Examples
The programming examples for individual commands in this manual are written in
HPbASIC 6.3 or C
Introduction to Programming
Talking to the Instrument
Talking to the Instrument
Computers acting as controllers communicate with the instrument by sending
and receiving messages over a remote interface. Instructions for programming
normally appear as ascii character strings embedded inside the output
statements of a host language available on your controller. The input statements
of the host language are used to read in responses from the oscilloscope
For example, HPBASIC uses the OUTPUT statement for sending commands
and queries. After a query is sent, the response is usually read in using the
ENTER statement
Messages are placed on the bus using an output command and passing the
device address, program message, and terminator. Passing the device address
ensures that the program message is sent to the correct interface and
instrument
The following HP BASIC statement sends a command which turns on label
displa
The s device address represents the address of the device being programmed
Each of the other parts of the above statement are explained in the following
pages
1-3
ntroduction to Programming
Program Message Syntax
Program message syntax
To program the instrument remotely, you must understand the command
format and structure expected by the instrument. The IeeE 488.2 syntax rules
govern how individual elements such as headers, separators, program data, and
terminators may be grouped together to form complete instructions. Syntax
definitions are also given to show how query responses are formatted. The
following figure shows the main syntactical parts of a typical program
slaleinert
Figure 1-1
PRCGRAM MESSAGF UNIT
OUTPUT XXX CHANNEL1EWLIMT ON
OUTPI
OMMAND
DE VICE ADDRESS
S RUCTION HEADER
PRCGRAM DATA
Program Message Syntax
Output Command
The output command is entirely dependent on the programming language
Throughout this manual, hPbasic is used in most examples of individual
commands. If you are using other languages you will need to find the
equivalents of HP baSIC commands like OUTPUT, ENtER, and clear to
convert the examples. The instructions listed in this manual are always shown
between quotation marks in the example programs
Device address
The location where the device address inust be specified is also dependent onl
the programming language you are using. In some languages, this may be
specified outside the output command. In HP BasIC, this is always specified
after the keyword OUTPUT. The examples in this manual assume the
oscilloscope is at device address 707. When writing programs, the address
varies according to how Lhe bus is configured
1-4
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