Measurement-computing Digital488 Manual do Utilizador

Digital488IEEE 488 to Digital InterfaceINSTRUCTION MANUALIOtech, Inc. • 25971 Cannon Road • Cleveland, Ohio 44146 • (440) 439-4091

Section 1 Introduction1.21.2 Available AccessoriesAdditional accessories that can be ordered for the Digital488 include:CA-7-11.5 foot IEEE 488 Cabl

Section 1 Introduction1.3a1.3 SpecificationsDigital488 SpecificationsDigital I/OTerminal Installation Category:Standard: Not Applicable. CE: Cate

Section 1 Introduction1.3bTerminal Installation Category:Standard: Not Applicable. CE: Category 1 for all terminals.Dimensions:188 mm deep x 140 mm

Section 1 Introduction1.3cDigital488/OEM Specifications:$51,1*Do not use this interface outdoors! The interface is intended for indoor use only!Outdo

Section 1 Introduction1.3dGeneralConfiguration:Five 8-bit ports, programmable as inputs or outputs. Also included are programmablehandshake lines, da

Section 1 Introduction1.51.4 AbbreviationsThe following IEEE 488 abbreviations are used throughout this manual.addr n IEEE bus address "n"A

Section 2 Getting Started2.1Getting Started2.1 InspectionThe Digital488 was carefully inspected, both mechanically and electrically,prior to shipment

Section 2 Getting Started2.2To modify any of these defaults, follow this simple procedure. Disconnect thepower supply from the AC line and from the i

Section 2 Getting Started2.32.2.2 IEEE 488 Bus Output Terminator SelectionThe terminating characters sent on output by the Digital488 aredetermined b

Warranty InformationYour IOtech warranty is as stated on the product warranty card. You may contact IOtech by phone,fax machine, or e-mail in regard

Section 2 Getting Started2.42.3 Digital Input/Output PortsThe Digital488 has 40 data lines which can be programmed in groups of 8 aseither input or o

Section 2 Getting Started2.5Digital488OEM I/O Connector Pin OutExternal Data Ready (I) Inhibit (O) Data Strobe (O)210 20 30 40 504939199129Clear (O) T

Section 2 Getting Started2.645SERVICE INPUT (Input).46EXTERNAL DATA READY [EDR] (Input).47,48 Not used.49+5 Volts (Do not exceed 50 mA load).50I/O CO

Section 2 Getting Started2.72.3.3.2 Data Strobe (Pin 42)The Data Strobe output is pulse for approximately 50microseconds after new data is output on

Section 2 Getting Started2.82.3.3.4 Inhibit (Pin 44)The Inhibit output is asserted while data on the selected I/Oport is being read into the I/O port

Section 2 Getting Started2.92.3.3.5 Trigger (Pin 43)The Trigger output is pulse for approximately 50microseconds after a GET (Group Execute Trigger)

Section 2 Getting Started2.102.4.1 My Talk Address (MTA)When the Digital488 is addressed to talk (R0) it asserts Inhibit, readsthe data from all port

Section 2 Getting Started2.112.4.2 My Listen Address (MLA)When the Digital488 is addressed to listen in the F0 through F4format, it accepts character

Section 2 Getting Started2.122.4.5 Interface Clear (IFC)IFC places the Digital488 in the Talker/Listener Idle State and pulsesthe Clear output line f

Section 2 Getting Started2.132.5 InstallationTo begin operating the Digital488, plug the external power supply into the rearjack on the interface.CAU

Digital488andDigital488OEMInstruction Manual110-0920Revision 4.2November 1990IOtech, Inc. ● 25971 Cannon Road ● Cleveland, Ohio 44146 ● (440) 439-409

Section 3 Command Descriptions3.1Command Descript

Section 3 Command Descriptions3.2Bit Set

Section 3 Command Descriptions3.3Bit Clear

Section 3 Command Descriptions3.4Bus Input/Output

Section 3 Command Descriptions3.5Configure

Section 3 Command Descriptions3.6Data

Section 3 Command Descriptions3.7OUTPUT 718;"

Section 3 Command Descriptions3.8Data Ready

Section 3 Command Descriptions3.9End or Identify

Section 3 Command Descriptions3.10Execute

Section 3 Command Descriptions3.11Format

Section 3 Command Descriptions3.12When the Digita

Section 3 Command Descriptions3.13 The Data Strob

Section 3 Command Descriptions3.14Data received f

Section 3 Command Descriptions3.15 F3 Number De

Section 3 Command Descriptions3.16F4 Format - Bin

Section 3 Command Descriptions3.17The only progra

Section 3 Command Descriptions3.18Handshake

Section 3 Command Descriptions3.19Inhibit

Table of ContentsSection1 Introduction Page1.1 General Description 1.11.2 Available Accessories1.21.3 Specifications 1.31.4 Abbreviations 1.5Section 2

Section 3 Command Descriptions3.20Invert

Section 3 Command Descriptions3.21Port

Section 3 Command Descriptions3.22Service Request

Section 3 Command Descriptions3.23M8 will generat

Section 3 Command Descriptions3.24Serial Poll Sta

Section 3 Command Descriptions3.25The M8 command

Section 3 Command Descriptions3.26Status

Section 3 Command Descriptions3.27Below is a summ

Section 3 Command Descriptions3.28K#

Section 3 Command Descriptions3.29Terminator

Table of ContentsSection 3 Command Descriptions PageConfigure (Cn) 3.5Data (D...Z) 3.6Data Ready (Rn) 3.8End or Identify (Kn) 3.9Execute (X) 3.10Forma

Section 3 Command Descriptions3.30Test

Section 4 IEEE 488 Primer4.1IEEE 488 Primer4.1 HISTORYThe IEEE 488 bus is an instrumentation communication bus adopted by the Institute of Electrical

Section 4 IEEE 488 Primer4.2At a committee meeting, everyone present usually listens. This is not the casewith the GPIB. The Active Controller selects

Section 4 IEEE 488 Primer4.3

Section 4 IEEE 488 Primer4.44.3 SEND IT TO MY ADDRESSIn the previous discussion, the terms Addressed to Talk and Addressedto Listen were used. These

Section 4 IEEE 488 Primer4.54.4.2 Interface Clear (IFC)The IFC line is used only by the System Controller. It is used to place allbus devices in a k

Section 4 IEEE 488 Primer4.64.5 HANDSHAKE LINESThe GPIB uses three handshake lines in an "I'm ready - Here's the data - I'vegot i

Section 4 IEEE 488 Primer4.74.6 DATA LINESThe GPIB provides eight data lines for a bit parallel/byte serial data transfer.These eight data lines use

Section 4 IEEE 488 Primer4.84.7.2 Listen Address Group (LAG)There are 31 (0 to 30) listen addresses associated with this group. The 3most significant

Section 4 IEEE 488 Primer4.94.7.8 Selected Device Clear (SDC)This causes a single device to be initialized to a pre-defined or power upstate. ($04)4.

Table of ContentsSection 4 IEEE 488 Primer Page4.7.6 Local Lockout (LLO) 4.84.7.7 Device Clear (DCL) 4.84.7.8 Selected Device Clear (SDC) 4.94.7.9 Ser

Section 4 IEEE 488 Primer4.104.7.14 Parallel Poll Configure (PPC)This configures devices capable of performing a Parallel Poll as towhich data bit the

Section 4 IEEE 488 Primer4.114.8.1 Serial PollSuppose the Controller receives a service request. For this example,let's assume there are several

Section 5 Service Information5.1Service Information5.1 Factory ServiceIOtech maintains a factory service center in Cleveland, Ohio. If problems are

Section 5 Service Information5.55.6 Digital488 Replaceable Parts ListSchematic Part Number DescriptionC101-C108 C-5-.1 Ceramic, 25vC110,C113 C-5-.1

Section 5 Service Information5.65.7 Digital488OEM Replaceable Parts ListSchematic Part Number DescriptionC101-C112 C-5-.1 Ceramic, 25vC113 C-5-1 Ce

Appendix A Digital488 Command SummaryCommand Code DescriptionA.1Bit Set AnSet bit n (1 thru 40)Bit Clear BnClear bit

Appendix A Digital488 Command SummaryCommand Code DescriptionA.2Inhibit Q0Clear Inhibit lineQ1Set Inhibit lineInvert

Section 1 Introduction1.1Introduction1.1 General DescriptionThe Digital488 is a digital input and output interface to the IEEE 488 bus.Each unit ha