IOtech Isolator488 Manual de usuario
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Isolator488 IEEE 488 Bus Isolator
USER’S MANUAL
IOtech, Inc. • 25971 Cannon Road • Cleveland, Ohio 44146 • (440) 439-4091
Warranty Information
Your IOtech warranty is as stated on the product warranty card. You may contact IOtech by phone,
fax machine, or e-mail in regard to warranty-related issues.
Limitation of Liability
IOtech, Inc. cannot be held liable for any damages resulting from the use or misuse of this product.
Copyright, Trademark, and Licensing Notice
All IOtech documentation, software, and hardware are copyright with all rights reserved. No part of this product may be
copied, reproduced or transmitted by any mechanical, photographic, electronic, or other method without IOtech’s prior written
consent. IOtech product names are trademarked; other product names, as applicable, are trademarks of their respective
holders. All supplied IOtech software (including miscellaneous support files, drivers, and sample programs) may only be used
on one installation. You may make archival backup copies.
FCC Statement
IOtech devices emit radio frequency energy in levels compliant with Federal Communications Commission rules (Part 15)
for Class A devices. If necessary, refer to the FCC booklet How To Identify and Resolve Radio-TV Interference Problems
(stock # 004-000-00345-4) which is available from the U.S. Government Printing Office, Washington, D.C. 20402.
CE Notice Many IOtech products carry the CE marker indicating they comply with the safety and emissions standards of the
European Community. As applicable, we ship these products with a Declaration of Conformity stating which
specifications and operating conditions apply.
Warnings, Cautions, Notes, and Tips
Refer all service to qualified personnel. This caution symbol warns of possible personal injury or equipment damage
under noted conditions. Follow all safety standards of professional practice and the recommendations in this manual.
Using this equipment in ways other than described in this manual can present serious safety hazards or cause equipment
damage.
This ESD caution symbol urges proper handling of equipment or components sensitive to damage from electrostatic
discharge. Proper handling guidelines include the use of grounded anti-static mats and wrist straps, ESD-protective
bags and cartons, and related procedures.
Specifications and Calibration
Specifications are subject to change without notice. Significant changes will be addressed in an addendum or revision to the
manual. As applicable, IOtech calibrates its hardware to published specifications. Periodic hardware calibration is not
covered under the warranty and must be performed by qualified personnel as specified in this manual. Improper calibration
procedures may void the warranty.
Quality Notice
IOtech has maintained ISO 9001 certification since 1996. Prior to shipment, we thoroughly test our products and
review our documentation to assure the highest quality in all aspects. In a spirit of continuous improvement, IOtech
welcomes your suggestions.
Isolator488
Instruction Manual
Part No. Isolator488-901
Revision 1.2
December 1991
IOtech, Inc.
25971 Cannon Road
Cleveland, Ohio 44146
(440) 439-4091
IMPORTANT!
READ THIS BEFORE INSTALLATION!
WARNING
The enclosure of the Isolator488 Bus Isolator is
internally connected to earth ground through the
power cord. However, the shield of the IEEE 488
cables attached to the Isolator488 and signal ground
pins may be at a high voltage with respect to earth
ground. Be sure to remove power from all devices in
your system before handling IEEE 488 cables
connected to the Isolator488. Failure to follow this
warning may result in personal injury or death.
IOtech, Inc. • 25971 Cannon Road • Cleveland, Ohio 44146 • (440) 439-4091
Table of Contents
Section 1 INTRODUCTION Page
1.1 General Description 1.1
1.2 Available Accessories 1.1
1.3 Specifications 1.2
1.4 Abbreviations 1.3
Section 2 GETTING STARTED Page
2.1 Inspection 2.1
2.2 Configuration 2.1
2.3 Modifications 2.4
2.4 Line Voltage Selection 2.7
2.5 Hardware Installations 2.9
2.6 Operation 2.10
2.6.1 BusLoading 2.11
2.6.2 Cabling Length 2.11
2.6.3 Signal Line Direction 2.12
2.6.4 Parallel Polling 2.13
2.6.5 Passing Control 2.13
Section 3 IEEE 488 Primer Page
3.1 History 3.1
3.2 General Structure 3.1
3.3 Send It To My Address 3.5
3.4 Bus Management Lines 3.5
3.4. Attention (ATN) 3.5
3.4.2 Interface Clear (IFC) 3.6
3.4.3 Remote Enable (REN) 3.6
3.4.4 End Or Identify (EOI) 3.6
3.4. Service Request (SRQ) 3.6
3.5 Handshake Lines 3.7
3.5.1 Data Valid (DAV) 3.7
3.5.2 Not Ready For Data (NRFD) 3.7
3.5.3 Not Data Accepted (NDAC) 3.7
3.6 Data Lines 3.8
3.7 Multiline Commands 3.8
Section 3 (cont.) Page
3.7.1 Go To Local (GTL) 3.8
3.7.2 Listen Address Group (LAG) 3.9
3.7.3 Unlisten (UNL) 3.9
3.7.4 Talk Address Group (TAG) 3.9
3.7.5 Untalk (UNT) 3.9
3.7.6 Local Lockout (LLO) 3.9
3.7.7 Device Clear (DCL) 3.9
3.7.8 Selected Device Clear (SDC) 3.10
3.7.9 Serial Poll Disable (SPD) 3.10
3.7.10 Serial Poll Enable (SPE) 3.10
3.7.11 Group Execute Trigger (GET) 3.10
3.7.12 Take Control (TCT) 3.10
3.7.13 Secondary Command Group (SCG) 3.10
3.7.14 Parallel Poll Configure (PPC) 3.11
3.7.15 Parallel Poll Unconfigure (PPU) 3.11
3.8 More On Service Requests 3.11
3.8.1 Serial Poll 3.12
3.8.2 Parallel Poll 3.12
Section 4 SERVICE INFORMATION Page
4.1 Factory Service 4.1
Appendix A Character Codes and IEEE Multiline Messages
Section 1 Introduction
1.1
Introduction
1.1 GENERAL DESCRIPTION
The Isolator488 increases the number of IEEE instruments and devices allowable
on the bus from 15, including the controller, to 28 while also providing optical
isolation between the system controller and devices on the isolated bus. Since the
Isolator488 does not occupy a bus address, its operation is entirely transparent to the
IEEE controller. The IEEE standard defines 31 valid primary bus addresses.
Therefore, no special software or bank switching is necessary to access the additional
devices allowed by the Isolator488. The Isolator488 and has no effect on bus data
transfer rates.
Two IEEE ports are provided. One connects directly to the controller's IEEE bus,
the other to an additional 14 instruments, printers, plotters and specialized peripherals
which may need to be optically isolated from the system controller.
1.2 AVAILABLE ACCESSORIES
Additional accessories that can be ordered for the Isolator488 include:
123-0900 Instruction Manual
CA-7-1 1.5 foot IEEE 488 cable
CA-7-2 6 foot IEEE 488 cable
CA-7-3 6 foot Shielded IEEE 488 cable
CA-7-4 Reverse entry 6 foot IEEE 488 cable
CN-20 Right Angle IEEE 488 adapter, male and female
CN-21 IEEE 488 connector Extender, male and female
CN-22 IEEE 488 multi-tap bus strip, four female
connectors wired in parallel.
CN-23 IEEE 488 panel mount feed-through connector,
male and female
Section 1 Introduction
1.2
1.3 SPECIFICATIONS
PROPAGATION DELAYS:
Local to Remote Talker
Data Lines 85 nS typ., 120 nS Max.
Command Lines 90 nS typ., 125 nS Max.
Remote to Local Talker
/ATN to Local Data 355 nS typ., 475 nS Max.
/ATN to Local DAV 155 nS typ., 2075 nS Max.
Data Lines 85 nS typ., 120 nS Max.
Command Lines 90 nS typ., 125 nS Max.
Parallel Poll Response 140 nS typ., 205 nS Max.
SIGNAL LINE DIRECTIONS:
Data Lines:
DIO1 - DIO7 Bidirectional
Handshake Lines:
DAV, NRFD, NDAC Bidirectional
Command Lines:
SRQ, ATN, REN, IFC To Local Bus
ATN To Remote Bus
EOI Bidirectional
CONNECTORS: Two IEEE 488 connectors with metric studs
INDICATORS: LED for Power
POWER: 105-125V or 210-250V,50, 60 Hz; 20 VA MAX.
ENVIRONMENT: 0 to 50 °C; 0 to 70% RH
DIMENSIONS: 425 mm deep x 45 mm wide x 208 mm high.
(16.75 "x 1.75 "x 8.20 ")
WEIGHT: 2.1 kg (4.6 lbs)
CONTROLS: Power switch
SUPPLIED ACCESSORIES: Power cable and manual
ISOLATION: IEEE 488 common on Controller Bus to IEEE 488
common on Instrument Bus:
1600 volts peak maximum @ sea level to 10,000 ft.
0 - 70° C, and 0 - 80% RH non-condensing OR
500 Vac maximum, 105V-Hz
Specifications are subject to change without notice.
Section 1 Introduction
1.3
1.4 Abbreviations
The following IEEE 488 abbreviations are used throughout this manual.
addr n IEEE bus address "n"
ATN Attention line
CA Controller Active
CR Carriage Return
data Data String
DCL Device Clear
GET Group Execute Trigger
GTL Go To Local
LA Listener Active
LAG Listen Address Group
LF Line Feed
LLO Local Lock Out
MLA My Listen Address
MTA My Talk Address
PPC Parallel Poll Configure
PPU Parallel Poll Unconfigure
SC System Controller
SDC Selected Device Clear
SPD Serial Poll Disable
SPE Serial Poll Enable
SRQ Service Request
TA Talker Active
TAD Talker Address
TCT Take Control
term Terminator
UNL Unlisten
UNT Untalk
* Unasserted
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