GPIB IntroductionGPIB Introduction

Advantech IA Technical Support Team

AgendaAgenda

1. Introduction to Advantech GPIB Card

2. Introduction to IEEE 488.1

3. Introduction to IEEE 488.2 & SCPI

GPIB HistoryGPIB History((GGeneral eneral PPurpose urpose IInterface nterface BBus)us)

GPIB was initially developed by HP, as it’s the interface between their own internal connection devices and called HPIB.

In 1975, IEEE announced IEEE-488-1975 based on HPIB. (It standardizes electrical and mechanical characteristics between Connectors & Cables, and defines the data transmission Handshaking agreement among collecting bus).

In 1978, IEEE made the first revision IEEE-488.1-1987 for defining the firmware.

IEEE-488.2-1987 is a newly defined standard, called Standard Code, Format, Protocols and Common Commands for solving software compatibility problems.

SCPI (Standard Commands for Programmable Instruments)

GPIB GPIB characteristicscharacteristics GPIB can connect 15 devices (0~31 address can be

assigned) to PC (controller), PC handles the transmission on bus.

The total cable length in a system should not exceed 20m (2m max. between a device and next device)

Text mode commands. (Easy to differentiate) Using three handshake line for handshaking to

ensure data transmission accuracy.

PCI-1670 IntroductionPCI-1670 Introduction

SpecificationSpecification

Supports Windows 95/98/Me/NT40/2000/XP and DOS OS. Provides NI-like driver & function libraries. Supports Visual C++ 、 Borland C++

Builder 、 Labwindows 、 Visual Basic 、 Delphi and

Labview…etc. Provides interactive control utility.

– GPIBTool.exe IEEE 488 bus transfer rates up to 1.5M bytes/sec.

– ( Actual rates depend on instrument capabilities )

PCI-1670 can connect to many GPIB PCI-1670 can connect to many GPIB instrumentsinstruments

Oscilloscope

Digital multi-meter Switch

Function generator

Advantech PCI-1670 GPIB Card & GPIB Advantech PCI-1670 GPIB Card & GPIB cablecable

PCI-1670PCI-1670 Performance test Performance test

Advantech PCI-1670

NIPCI-GPIB

Big block data ( 106496 bytes) 1.142 sec 1.116 secSmall data (45 bytes) 0.033 sec 0.033 sec

IEEE 488.1 IntroductionIEEE 488.1 Introduction

GPIB UsageGPIB Usage

The goal of GPIB usageUsing PC to integrate control and data collection on many instruments GPIB is suitable for measurement or test system

In general:Advanced instruments Support GPIBLow price instruments Support RS-232

The transmission speed 8Mbits/s is enough for many instruments

High speed data transmission instruments (2%)Ethernet TCP/IP 100M~1Gbits/s or USB 2.0 480Mbits/s

IEEE 488 Signal LinesIEEE 488 Signal Lines

IEEE 488 bus consists of 16 signal lines, 8 ground lines and shielding

The 16 lines can be divided into 3 categories:1. Eight data lines2. Five interface management lines3. Three handshake lines

For more information about signal lines please refer to PCI-1670 manual

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

DIO5

DIO6

DIO7

DIO8

REN

GND

GND

GND

GND

GND

GND

SIGNAL GROUND

DIO1

DIO2

DIO3

DIO4

EOI

DAV

NRFD

NDAC

IFC

SRQ

ATN

SHIELD

GPIB Connector and Pin Assignments

Data lines

Handshake linesData lines

IEEE 488.2 IntroductionIEEE 488.2 Introduction

IEEE 488.2 common IEEE 488.2 common commandscommands

Group Mnemonic Name

Auto configure *AAD Accept address command

Auto configure *DLF Disable listener function command

System data *IDN? Identification query

System data *OPT? Optional identification query

System data *PUD Protected user data command

System data *PUD? Protected user data query

System data *RDT Resourec description transfer command

System data *RDT? Resourec description transfer query

Internal operatio *CAL? Calibration query

Internal operations *LRN? Learn device setup query

Internal operations *RST Reset command

Internal operations *TST? Selftest query

Controller *PCB Pass control back command

Compliance

Optional

Optional

Mandatory

Optional

Optional

Optional

Optional

Optional

Optional

Optional

Mandatory

Mandatory

Mandatory if orthen than C0

Group Mnemonic Name Compliance

Synchronization *OPC Operation complete command Mandatory

Synchronization *OPC? Operation complete query Mandatory

Synchronization *WAI Wait-to-continue command Mandatory

Macro *DMC Define macro command Optional

Macro *EMC Enable macro command Optional

Macro *EMC? Enable macro query Optional

Macro *GMC? Get macro contents query Optional

Macro *LMC? Learn macro query Optional

Macro *PMC Purge macro command Optional

Parallel poll *IST? Individual status query Mandatory

Parallel poll *PRE Parallel poll register enable command if

Parallel poll *PRE? Parallel poll register enable query PP1

Stored settings *RCL Recall command Optional

Stored settings *SAV Save command Optional

IEEE 488.2 common IEEE 488.2 common commandscommands

Group Mnemonic Name Compliance

Status & Event *CLS Clear status command Mandatory

Status & Event *ESE Standard event status enable command Mandatory

Status & Event *ESE? Standard event status enable query Mandatory

Status & Event *ESR? Standard event status register query Mandatory

Status & Event *PSC Power on status clear command Optional

Status & Event *PSC? Power on status clear query Optional

Status & Event *SRE Service request enable query Mandatory

Status & Event *SRE? Service request enable query Mandatory

Status & Event *STB? Read status byte query Mandatory

Trigger *DDT Define device trigger command Optional if DT1

Trigger *DDT? Define device trigger query Optional if DT1

Trigger *TRG Trigger command Mandatory if DT1

IEEE 488.2 common IEEE 488.2 common commandscommands

SCPI SCPI

● Standard Commands for Programmable Instruments

HP-SL ( HP System Language )

TMSL ( Test and Measurement System Language )

SCPI ( HP TMSL + Tek ADID(Analog Data Interchange Format) )

IEEE 488.1, IEEE 488.2, and SCPIIEEE 488.1, IEEE 488.2, and SCPI

SCPI

IEEE-488.2

IEEE-488.1

1987Defined Codes, Formats, Protocols,and Common Commands

1975Defined BusDefined Bus Handshake

1989DefinedStandardCommands

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