Measurement-computing Isolator488 User Manual

Isolator488 IEEE 488 Bus IsolatorUSER’S MANUALIOtech, Inc. • 25971 Cannon Road • Cleveland, Ohio 44146 • (440) 439-4091

Section 2 Getting Started2.1 GETTING STARTED2.1 InspectionThe Isolator488 was carefully inspected, mechanically and electrically, prior tos

Section 2 Getting Started2.2Earth Ground The Ground terminal on the AC power cable. This isinternally connected to the chassis of the Isolator488.Con

Section 2 Getting Started2.3

Section 2 Getting Started2.4As shown in the preceding diagram, the Isolator488 is shipped with a 'soft ground'consisting of a 1 MΩ resistor

Section 2 Getting Started2.5F2JPR1R4C16C47 C48JPR2F3R5C49C50C59TO CONTROLLERTO INSTRUMENTSController Port Common Components Instrument Port Common C

Section 2 Getting Started2.6The following options are available on each port:1. The Shield pin of the IEEE 488 connector (pin 12) may be connected to

Section 2 Getting Started2.72. To connect the Instrument Common to earth ground, insert a 1/2 amp fuse in thefuse clips labelled F3. Make note of th

Section 2 Getting Started2.8WARNINGNever open the Isolator488 case while itis connected to the AC line. Internalvoltage potentials exist which couldc

Section 2 Getting Started2.92.5 Hardware InstallationIncluded with the Isolator488 Bus Isolator are accessories for rack or benchuse. If rack mount

Section 2 Getting Started2.102.6 OperationTo begin operating the Isolator488, plug the power supply into the rear paneljack. Apply power to the Isol

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 Started2.112.6.2 Cabling LengthThe IEEE 488 specification allows for cabling distance between busdevices of 2 meters (approx. 7 fee

Section 2 Getting Started2.12When ATN is unasserted, the Isolator488 asserts NDAC on both ports,for a minimum of 200 nanoseconds, while looking for an

Section 3 IEEE 488 Primer3-1IEEE 488 Primer3.1 HISTORYThe IEEE 488 bus is an instrumentation communication bus adoptedby the Institute of Electrical

Section 3 IEEE 488 Primer3-2At a committee meeting, everyone present usually listens. This is notthe case with the GPIB. The Active Controller selects

Section 3 IEEE 488 Primer3-3}DIO1-8DAVNRFDNDACIFCATNSRQRENEOITo Other DevicesDevice 1System ControllerAble to Talk,Listen, and ControlDevice 2DMMAble

Section 3 IEEE 488 Primer3-43.3 SEND IT TO MY ADDRESSIn the previous discussion, the terms Addressed to Talk andAddressed to Listen were used. These

Section 3 IEEE 488 Primer3-53.4.2 Interface Clear (IFC)The IFC line is used only by the System Controller. It is used toplace all bus devices in a k

Section 3 IEEE 488 Primer3-63.5 HANDSHAKE LINESThe GPIB uses three handshake lines in an "I'm ready - Here's the data- I've got i

Section 3 IEEE 488 Primer3-7All ReadyAll ReadyNone ReadyNone ReadyValid Not ValidNot ValidValid1st Data Byte 2nd Data ByteAll AcceptAll AcceptNone A

Section 3 IEEE 488 Primer3-83.7.2 Listen Address Group (LAG)There are 31 (0 to 30) listen addresses associated with this group.The 3 most significant

Isolator488Instruction ManualPart No. Isolator488-901Revision 1.2December 1991IOtech, Inc. 25971 Cannon Road Cleveland, Ohio 44146 (440) 439-4091

Section 3 IEEE 488 Primer3-93.7.8 Selected Device Clear (SDC)This causes a single device to be initialized to a pre-defined orpower up state. ($04)3.

Section 3 IEEE 488 Primer3-103.7.14 Parallel Poll Configure (PPC)This configures devices capable of performing a Parallel Poll as towhich data bit the

Section 3 IEEE 488 Primer3-113.8.1 Serial PollSuppose the Controller receives a service request. For thisexample, let's assume there are several

Service Information4.1 FACTORY SERVICEIOtech maintains a factory service center in Cleveland, Ohio. If problems areencountered in using the Expander4

Appendix A Character Codes And IEEE Multiline MessagesA.1NULSOHSTXETXEOTENQACKBELBSHTLFVTFFCRSOSIDLEDC1DC2DC3DC4NAKSYNETBCANEMSUBESCFSGSRSUSSP!"#

IMPORTANT!READ THIS BEFORE INSTALLATION!WARNINGThe enclosure of the Isolator488 Bus Isolator isinternally connected to earth ground through thepower c

Table of ContentsSection 1 INTRODUCTION Page1.1 General Description 1.11.2 Available Accessories 1.11.3 Specifications 1.21.4 Abbreviations 1.3Section

Section 3 (cont.) Page3.7.1 Go To Local (GTL) 3.83.7.2 Listen Address Group (LAG) 3.93.7.3 Unlisten (UNL) 3.93.7.4 Talk Address Group (TAG) 3.93.7.5 U

Section 1 Introduction1.1Introduction1.1 GENERAL DESCRIPTIONThe Isolator488 increases the number of IEEE instruments and devices allowableon the bus

Section 1 Introduction1.21.3 SPECIFICATIONSPROPAGATION DELAYS:Local to Remote TalkerData Lines 85 nS typ., 120 nS Max.Command Lines 90 nS typ.,

Section 1 Introduction1.31.4 AbbreviationsThe following IEEE 488 abbreviations are used throughout this manual.addr n IEEE bus address "n"A