GW Instek GDS-820 Programming Manuale del proprietario

GDS-806/810/820/840 Programming Manual

Digital Storage Oscilloscope

GDS-806/810/820/840

Programming Manual

GW Part No: 82DS-82000I0

GDS-806/810/820/840 Programming Manual

Table of Contents Pages

1. INTRODUCTION................................................................................................................... 2

2. COMPUTER’S CONNECTION............................................................................................. 6

3. REMOTE CONTROL'S COMMANDS................................................................................ 12

4. DETAILS OF COMMAND REFERENCE ........................................................................... 19

5. STATUS REPORTS............................................................................................................ 71

6. ERROR MESSAGES.......................................................................................................... 79

7. PROGRAM TEMPLATE FOR GPIB................................................................................... 80

8. APPENDIX A: HOW CAN WE CONVERT THE HEXADECIMAL FORMAT TO A

FLOATING POINT FORMAT. ................................................................................................ 88

Due to continuous improvements in the GDS-806/810/820/840 Digital Storage

Oscilloscope, information contained in this manual is subject to change

without notice. Contact GOOD WILL, for revisions and corrections.

GOOD WILL Instrument Co., LTD.

NO. 95-11, PAO-CHUNG ROAD, HSIN-TIEN CITY,

TAIPEI HSIEN, TAIWAN

Telephone – 886-2-29179188 Fax – 886-2-2917-9189

E-mail - [email protected]

http://www.goodwill.com.tw

GDS-806/810/820/840 Programming Manual

1. Introduction

Users can drive this digital storage oscilloscope by using the GPIB (General

Purpose Interface Bus) system with a computer, or from a computer across the

RS-232 serial connection. Commands sent over either interface can read or set

any GDS-806/810/820/840’s instructions. This chapter explains how to carry out

the following tasks.

Notes for GPIB installation

If you are setting up the oscilloscope with a GPIB system, please check the

following regulations:

zOnly a maximum of 15 devices can be connected to a single GPIB bus.

zDo not use more than 20 m of cable to connect devices to a bus.

zConnect one device for every 2 m of cable used.

zEach device on the bus needs a unique device address. No two devices can

share the same device address.

zTurn on at least two-thirds of the devices on the GPIB system while you use

the system.

zDo not use loop or parallel structure for the topology of GPIB system.

GDS-806/810/820/840 Programming Manual

Notes for RS-232 Configuration

This oscilloscope contains a DB 9-pin, male RS-232 connector for serial

communication with a computer or terminal. The RS-232 interface of this

oscilloscope is configured as an RS-232 “Data Terminal Equipment”, so that data

is sent from pin 3 and received on pin 2. For remote controls, the RS-232 interface

has to be connected with a computer or terminal.

Pin Assignments

The pin assignments for RS-232 interface of the oscilloscope are listed below.

1. No connection

2. Receive Data(RxD) (input)

3. Transmit Data(TxD) (output)

4. No connection

5. Signal Ground (GND)

6. No connection

7. No connection

8. No connection

9. No connection

Figure 1-1: Pin assignments for the RS232 connector

DB9 to DB9 Wiring

The wiring configuration is used for computer with DB9 connectors that configured

as Data Terminal Equipment.

Oscilloscope

(DB9, DTE)

Computer

(DB9, DTE)

Pin2

Pin3

Pin2

Pin3

Pin5Pin5

Figure 1-2: DB9 to DB9 wiring

GDS-806/810/820/840 Programming Manual

When the oscilloscope is set up with a RS-232 interface, please check the

following points:

zDo not connect the output line of one DTE device to the output line of the

other.

zMany devices require a constant high signal on one or more input pins.

zEnsure that the signal ground of the equipment is connected to the

signal ground of the external device.

zEnsure that the chassis ground of the equipment is connected to the

chassis ground of the external device.

zDo not use more than 15m of cable to connect devices to a PC.

zEnsure the same configurations are used on the device as the one used

on PC terminal.

zEnsure the connector for the both side of cable and the internal

connected line are met the demand of the instrument.

Computer’s Connection for RS-232

A personal computer with a COM port is the essential facilities in order to operate

the digitizing oscilloscope via RS-232 interface.

The connections between oscilloscope and computer are as follows:

I. Connect one end of a RS-232 cable to the computer.

II. Connect the other end of the cable to the RS-232 port on the oscilloscope.

III. Turn on the oscilloscope.

IV. Turn on the computer.

Figure 1-3, shows the GPIB port and RS-232 port’s locations on the rear panel of

the oscilloscope.

GDS-806/810/820/840 Programming Manual

Figure 1-3. Rear panel of the oscilloscope

(1): Main power switch

(2): AC power socket

(3): GPIB port (option for all series oscilloscopes)

(4): Fuse drawer

(5): “SELF CAL” BNC output

(6): “GO/NO GO” BNC output (option for GDS-806/810)

(7): USB connector (option for GDS-806/810)

(8): Printer port (option for GDS-806/810)

(9): RS-232 port

GDS-806/810/820/840 Programming Manual

2. Computer’s Connection

A personal computer with a GPIB card is the essential stuff in order to operate the

oscilloscope via GPIB interface.

The connections between oscilloscope and computer are following:

I. Connect one end of a GPIB cable to the computer.

II. Connect the other end of the GPIB cable to the GPIB port on the Oscilloscope.

III. Turn on the oscilloscope.

IV. Turn on the computer.

The GPIB interface capabilities:

The GPIB interface of the oscilloscope corresponds to the standard of

IEEE488.1-1987, IEEE488.2-1992 and SCPI-1994. The GPIB interface functions

are listed as follows:

SH1(Source

Handshake):

The oscilloscope can transmit multilane messages

across the GPIB.

AH1(Acceptor

Handshake):

The oscilloscope can receive multilane messages

across the GPIB.

T6(Talker): Talker interface function includes basic talker, serial

poll, and unaddress if MLA capabilities, without talk

only mode function.

L4 (Listener): The oscilloscope becomes a listener when the

controller sends its listen address with the ATN

(attention) line asserted. The oscilloscope does not

have listen only capability.

GDS-806/810/820/840 Programming Manual

SR1 (Service Request): The oscilloscope asserts the SRQ (Service request)

line to notify the controller when it requires service.

RL1 (Remote/Local): The oscilloscope responds to both the GTL (Go to

Local) and LLO (Local Lock Out) interface messages.

PP0 (Parallel Poll): The oscilloscope has no Parallel Poll interface

function.

DC1 (Device Clear): The oscilloscope has Device clear capability to return

the device to power on status.

DT0 (Device Trigger): The oscilloscope has no Device Trigger interface

function.

C0 (Controller) : This oscilloscope can not control other devices.

The GPIB address setting

To change the GPIB address, please use the following steps:

zPress the UTILITY button on the front panel. The utility menu provides

Interface Menu sub menu by pressing F2 softkey which GPIB sub menu is

included. Press F1 softkey to select GPIB setting menu.

For GPIB sub menu

zType GPIB: Select GPIB port.

zAddr 1~30: select the appropriate address for GPIB.

zPrevious Menu: back to previous menu.

GDS-806/810/820/840 Programming Manual

The GPIB connection testing

If you want to test the GPIB connection is whether working or not, use the National

Instrument’s “Interactive Control utility” for instance, you communicate with the

GPIB devices through calls you interactively type in at the keyboard.

The Interactive Control can help you to learn about the instrument and to

troubleshoot problems by displaying the following information on your screen after

you enter a command:

zResults of the status word (ibsta) in hexadecimal notation

zMnemonic constant of each bit set in ibsta

zMnemonic value of the error variable (iberr) if an error exists (the ERR bit is

set in ibsta)

zCount value for each read, write, or command function

zData received from your instrument

You can access online help in Interactive Control by entering help at the prompt, or

you can get help on a specific function by entering help <function> at the prompt,

where <function> is the name of the function for which you want help.

To start Interactive Control within National Instrument’s “Measurement &

Automation Explorer”, complete the following steps:

1. Select Tools→I-488.2 Utilities→Interactive Control.

2. Open either a board handle or device handle to use for further NI-488.2 calls.

Use ibdev to open a device handle, ibfind to open a board handle, or the set

488.2 command to switch to a 488.2 prompt.

GDS-806/810/820/840 Programming Manual

The following example uses ibdev to open a device, assigns it to access board

gpib0, chooses a primary address of 7 with no secondary address, sets a timeout

of 10 seconds, enables the END message, and disables the EOS mode.

:ibdev

enter board index: 0

enter primary address: 7

enter secondary address: 0

enter timeout: 13

enter ‘EOI on last byte’ flag: 1

enter end-of-string mode/byte: 0

ud0:

Note: If you type a command and no parameters, Interactive Control prompts you

for the necessary arguments. If you already know the required arguments, you can

type them at the command prompt, as follows:

:ibdev 0 7 0 13 1 0

ud0:

Note: If you do not know the primary and secondary address of your GPIB

instrument, right-click on your GPIB interface in Measurement & Automation

Explorer and select Scan for Instruments. After Explorer scans your interface, it

displays your instrument address in the right window panel.

3. After you successfully complete ibdev, you have a ud prompt. The new

prompt, ud0, represents a device-level handle that you can use for further

NI-488.2 calls. To clear the device, use ibclr, as follows:

ud0: ibclr

[0100] (cmpl)

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