Keysight Technologies U1281A Instrucciones de funcionamiento

Keysight U1281A/U1282A

Handheld Digital Multimeter

Programming

Guide

2Keysight U1281A/U1282A Programming Guide

Notices

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Manual Part Number

U1281-90001

Edition

Edition 1, July 22, 2015

Printed in Malaysia

Keysight Technologies

Bayan Lepas Free Industrial Zone,

11900, Penang, Malaysia

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hazard. It calls attention to an

operating procedure, practice, or

the like that, if not correctly

performed or adhered to, could

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WARNING

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hazard. It calls attention to an

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result in personal injury or death.

Do not proceed beyond a

WARNING notice until the

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understood and met.

Keysight U1281A/U1282A Programming Guide 3

Table of Contents

1 Introduction

Configuring the IR interface 6

Introduction to Remote Commands 7

2 Remote Commands

U1281A/U1282A Configuration Overview 12

*IDN? 13

*RST 14

*CLS 15

ABOR 16

CALC:AVER 17

CALC:PEAK 18

CONF? 19

FETC? 20

INIT 21

READ? 22

STAT? 23

SYST:BATT? 26

TRIG:SOUR 27

TRIG:REF:COUN 28

4Keysight U1281A/U1282A Programming Guide

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Keysight U1281A/U1282A

Handheld Digital Multimeter

Programming Guide

1 Introduction

Configuring the IR interface 6

Introduction to Remote Commands 7

Syntax conventions 7

Querying parameter settings 8

Returned result 8

Prompts 8

This chapter describes the parameters that configure the U1281A/U1282A, and helps you

determine the settings to achieve optimum performance.

1Introduction

6Keysight U1281A/U1282A Programming Guide

Configuring the IR interface

The U1281A/U1282A may be operated via an IR interface. The remote control operation

will enable you to manually operate the multimeter via a terminal, or to automatically

execute a host computer program.

The default parameters for the U1281A/U1282A are:

–Baudrate:9600 bits per second

– Parity bit : None

– Data bits : 8data bits

– Number of Stop Bits : 1bit

Ensure that the serial port terminator to CR/LF is configured for both the transmit and

receive settings.

Each time after a *RST command is sent to the U1281A/U1282A, the communication

buffer (transmit and receive) must be cleared before the next command is sent.

In order to ensure smooth communication, allow sufficient time for the U1281A/U1282A to

respond to each command. In most cases, this means refers to a 5-second delay after the

*RST command and a 200-millisecond delay for all other commands.

For situations where the above delay is insufficient and is related to the serial port

hardware, operating system (OS) serial communication buffer, or the central processing

unit (CPU) response time, you may consider increasing the delay time to maintain stable

communication with the U1281A/U1282A.

NOTE

– The Carriage Return (CR) character (0x0D, \r) moves the cursor to the beginning of the

line without advancing to the next line. This character is used as a new line character in

Commodore and Early Macintosh operating systems (OS-9 and earlier).

– The Line Feed (LF) character (0x0A, \n) moves the cursor down to the next line without

returning to the beginning of the line. This character is used as a new line character in

UNIX-based systems (Linux, Mac OS X, etc.).

– The End Of Line (EOL) sequence (0x0D0x0A, \r\n) is actually two ASCII characters—a

combination of the CR and LF characters. It moves the cursor both down to the next

line and the beginning of that line. This character is used as a new line character in

most other non-Unix operating systems including Microsoft Windows, Symbian OS, and

others.

Introduction 1

Keysight U1281A/U1282A Programming Guide 7

Introduction to Remote Commands

Remote commands control instrument functions. A subsystem command has a hierarchical

structure that usually consists of a top-level (or root) keyword, one or more lower level

keywords, and parameters. The following example shows a query and its associated

subsystem:

CALC is a root level keyword with AVER as the second level keyword, and MAX as the

third-level keyword.

Syntax conventions

Throughout this programming guide, the following conventions are used for remote

command syntax:

– Square brackets “[ ]” indicate optional keywords or parameters and can be omitted. The

brackets are not sent with the command string. If you do not specify a value for an

optional parameter, the instrument chooses a default value.

– Braces “{ }” enclose one or more parameters that may be included zero or more times.

The brackets are not sent with the command string.

– Triangle brackets “< >” indicate that you must substitute a value for the enclosed

parameter. The brackets are not sent with the command string.

– Parentheses “( )” enclose parameters that are usually a channel list.

– Vertical bars “|” can be read as “or” and are used to separate alternative parameter

options.

Only short form commands are recognized by the instrument. For example, consider the

keyword TRIGger. Only the short form—which is TRIG—will be recognized by the

instrument. Other forms, such as TRIGG, TRIGge, or even TRIGger, will generate errors. An

example of the command syntax format is illustrated below:

-> CALC:AVER:MAX?

-> TRIG:SOUR <BUS|REF|IMM>

1Introduction

8Keysight U1281A/U1282A Programming Guide

Querying parameter settings

You can query the current value of most parameters by adding a question mark (?) to the

command. For example, you can query the function of the primary display measurement by

sending:

Responding Message

Returned result

After the U1281A/U1282A executes a query command, the return of the result will be in the

following format:

On the multimeter warning the returned prompts will be in the following format except Xon

and Xoff:

Prompts

The U1281A/U1282A will generate a system warning by sending a prompt string to the

host through the remote interface when the U1281A/U1282A has a status change as listed

in the table below.

-> CONF?

<- <Result> + <CR> <LF>

<- <Prompts> + <CR> <LF>

Prompt Description

﹡LLocal mode

﹡CCalibration mode

﹡ERemote command error warning

﹡BLow battery warning

﹡IInput warning (Please refer to STAT? command)

﹡0Rotary position: ACV measurement

﹡1Rotary position: ACmV measurement

﹡2Rotary position: ACDCV measurement

﹡3Rotary position: ACDCmV measurement

﹡4Rotary position: RES/CONT measurement

Introduction 1

Keysight U1281A/U1282A Programming Guide 9

﹡5Rotary position: Diode/Hz measurement

﹡6Rotary position: CAP/TEMP measurement

﹡7Rotary position: uA/mA measurement

﹡8Rotary position: A measurement

﹡9Rotary position: SQU output

ASC(&H11) Xon: The meter is available

ASC(&H13) Xoff: The meter is busy

Prompt Description

1Introduction

10 Keysight U1281A/U1282A Programming Guide

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