Measurement Extender 488HS User Manual
the smart approach to instrumentation
™
IOtech, Inc.
25971 Cannon Road Cleveland, OH 44146
Phone: (440) 439-4091 Fax: (440) 439-4093
E-mail: sales@iotech.com Internet: http:/www.iotech.com
Extender 488HS User’s Manual
p/n EXT488/HS-901, Rev. 2.0
1996-1997 by IOtech, Inc. Part No.EXT488/HS-901, Rev. 2.0
©
Printed in the United States of America
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.
Phone: (440) 439-4091, fax: (440) 439-4093, e-mail: sales@iotech.com
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 i n 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.
Table of Contents
Section
Section 2 Getting Started ...........................................................................................................................................2.1
Section 3 IEEE 488 Primer..........................................................................................................................................3.1
1 Introduction 1.1
1.1 Description 1.1
1.2 Available Accessories 1.2
1.3 Specifications 1.2
1.4 Abbreviations 1.4
2.1 Inspection ..................................................................................................................................................2.1
2.2 Extender488/HS Configuration.................................................................................................................2.1
2.3 Front Panel Indicators................................................................................................................................2.3
2.4 Line Voltage Selection ..............................................................................................................................2.4
2.5 Hardware Installation.................................................................................................................................2.6
2.6 Operation...................................................................................................................................................2.7
2.7 Speed Considerations ................................................................................................................................2.8
3.1 History.......................................................................................................................................................3.1
3.2 General Structure.......................................................................................................................................3.1
3.3 Send It To My Address..............................................................................................................................3.4
3.4 Bus Management Lines.............................................................................................................................3.4
3.4.1 Attention (ATN) ....................................................................................................................3.4
3.4.2 Interface Clear (IFC)..............................................................................................................3.4
3.4.3 Remote Enable (REN)...........................................................................................................3.5
3.4.4 End or Identify (EOI).............................................................................................................3.5
3.4.5 Service Request (SRQ)..................................................................................................... .....3.5
3.5 Handshake Lines........................................................................................................................................3.5
3.5.1 Data Valid (DAV)..................................................................................................................3.5
3.5.2 Not Ready for Data (NRFD)..................................................................................................3.6
3.5.3 Not Data Accepted (NDAC)..................................................................................................3.6
3.6 Data Lines 3.7
3.7 Multiline Commands.................................................................................................................................3.7
3.7.1 Go To Local (GTL)................................................................................................................3.7
3.7.2 Listen Address Group (LAG)................................................................................................3.7
3.7.3 Unlisten (UNL)......................................................................................................................3.7
3.7.4 Talk Address Group (TAG)...................................................................................................3.7
3.7.5 Untalk (UNT).........................................................................................................................3.7
3.7.6 Local Lockout (LLO).............................................................................................................3.8
3.7.7 Device Clear (DCL)...............................................................................................................3.8
3.7.8 Selected Device Clear (SDC)............................................................................................... ..3.8
3.7.9 Serial Poll Disable (SPD)....................................................................................................... 3.8
3.7.10 Serial Poll Enable (SPE)....................................................................................................3.8
3.7.11 Group Execute Trigger (GET)...........................................................................................3.8
3.7.12 Take Control (TCT)...........................................................................................................3.8
3.7.13 Secondary Command Group (SCG)...................................................................................3.9
3.7.14 Parallel Poll Configure (PPC)............................................................................................3.9
3.7.15 Parallel Poll Unconfigure (PPU)........................................................................................3.9
3.8 More On Service Requests........................................................................................................................3.9
3.8.1 Serial Poll...............................................................................................................................3.10
3.8.2 Parallel Poll............................................................................................................................3.10
Table of Contents
Section 4 Service Information.....................................................................................................................................4.1
4.1 Factory Service..........................................................................................................................................4.1
4.2 Theory of Operation..................................................................................................................................4.1
4.3 Extender488/HS Cable Construction.........................................................................................................4.1
4.3.1 Cable Wiring Diagram...........................................................................................................4.2
Appendix A Character Codes and IEEE Multiline Messages ............................................................................................A.1
Section 1 Introduction
I
D
I
I
D
I
H
P
U
1
Introduction
1.1 Description
The Extender488/HS High Speed IEEE 488 Bus Extender enables IEEE
488 devices to be controlled at a distance of up to 1,000 meters from a host
computer. The Extender488/HS overcomes the limit imposed by the IEEE 488
specification of 2 meters between any two devices. In addition, the
Extender488/HS Bus Extender allows up to 27 devices to be on the bus (plus the
controller and the two Extender488/HS Bus Extenders), versus the 14 device limit
imposed by the IEEE standard.
Two bus extenders are required to perform bus extension. The bus
connected to the host computer, or controller, is the "local" bus. The bus to which
control is extended is the "remote" bus. One Extender488/HS Bus Extender is
required on each bus to accomplish IEEE bus extension.
Communication between bus extenders is accomplished with parallel data
transmission, using RS-422 data drivers and receivers within the Extender488/HS
Bus Extender. This differential parallel data format provides high noise immunity,
high speed, and long-distance capability using a special cable.
Operation of the Extender488/HS Bus Extender is completely transparent to
the system. The controller can access both local and remote devices in exactly the
same manner.
IEEE
Controller
evices
evices
EEE
EEE
EEE
EEE
Up to
13 IEEE
Devices
Up to
14 IEEE
Devices
Extender488/HS
Extender488/HS
igh-Speed
arallel Link
p to
000 meters
1.1
Section 1 Introduction
1.2 Available Accessories
The following accessories are available from IOtech for use with the Extender488/HS
Bus Extender:
CA-7-1
CA-7-2
CA-7-3
CA-7-2
CA-56-30
CA-56-10
CN-20
CN-48
CN-22
CN-23
MAN-116-0015
1.5 foot IEEE 488 cable
6 foot IEEE 488 cable
6 foot IEEE 488 cable; shielded
6 foot IEEE 488 cable; reverse entry
30 m. Shielded parallel cable with ma ting connectors for the
Extender488/HS
10 m. Shielded parallel cable with ma ting connectors for the
Extender488/HS
Right angle IEEE 488 adapter
Extender488/HS cable adapter
IEEE 488 multi-tap bus strip; 4 connectors in parallel
IEEE 488 panel mount feed-thru connector
Additional Manual
Refer to the IOtech catalog for those accessories not listed here.
1.3 Specifications
IEEE 488-1978
Implementation: Proprietary transparent con tr ol and data transfers.
PASS CONTROL is not supported.
Connector: Standard IEEE 488 connector with metric studs.
Parallel Interface
EIA RS-422A: Balanced voltage on all signal lines.
Connector: 50-pin Centronics female.
Max. Cable Length: 1000 meters.
1.2
Section 1 Introduction
General
Data Rates: Specifications apply to data transfers after
addressing has been established.
Cable Length m. (ft.) Data Rate (kB/s, avg) *
10 (32.8) 800
20 (65.6) 700
50 (164) 450
100 (328.1) 300
200 (656.2) 150
500 (1640.5) 75
1000 (3281.0) 40
* using a 500ns data settling delay
Indicators: LEDs for IEEE Talk, Listen, Local Extender,
Remote
Extender, Connect, and Power.
Power: 105-125V or 210-250V; 50-60 Hz, 30 VA Max.
Dimensions: 425mm wide x 45mm high x 208mm deep
(16.75" x 1.75" x 8.20").
Weight: 2.1 kg. (4.6 lbs).
Environment: 0° - 50°C; 0 to 90% R.H. Non-Condensing
Controls: Power Switch (external),
Configuration switch (external).
Specifications subject to change without notice.
1.3
Section 1 Introduction
1.4 Abbreviations
The following IEEE 488 abbreviations are used throughout this manual.
n
addr
ATN Attention line
CA Controller Active
CO Controller
CR Car riage 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
PE Peripheral
PPC Parallel Poll Configure
PPU Parallel Poll Unconfigure
SC System Controller
SDC Selected Device Clear
SPD Serial Poll Disable
SPE Serial Poll E nable
SRQ Service Request
TA Talker Active
TAD Talker Address
TCT Take Control
term Terminator
UNL Unlisten
UNT Untalk
* Unasserted
IEEE bus address "n"
1.4
Section 2 Getting Started
Getting Started
2.1 Inspection
Your Extender488/HS IEEE 488 Bus Extender was carefully inspected, both
mechanically and electrically, prior to shipment. When you receive the Extender488/HS
Bus Extender, carefully unpack all items from the shipping carton and check for any
obvious signs of physical damage which may have occurred during shipment.
Immediately report any damage found to the shipping agent. Remember to retain all
shipping materials in the event that shipment back to the factory becomes necessary.
Every Extender488/HS Bus Extender is shipped with the following:
Extender488/HS
•
MAN-116-0015
•
A-116-0001
•
Note: accessories ordered may be packaged and shipped separately
Instruction Manual
High Speed IEEE 488 Bus Extender Interface
Accessory Kit (includes power cable, fuse,
and rack mounting hardware)
2.2 Extender488/HS Configuration
Two Extender488/HS IEEE Bus Extenders are required to accomplish bus extension, with one
connected directly to the Local IEEE 488 bus, and the other connected to the Remote IEEE 488 bus.
CAUTION
Make sure that the Extender488/HS Bus Extender that is connected to the controller
is set for Local Extender mode and the other Extender488/HS Bus Extender is set to
Remote Extender mode before applying power. Failure to observe this caution will
result in damage to both Extender488/HS Bus Extenders.
Both local and remote bus extenders are identical. Before either unit is powered on, switch #1 of
the rear panel configuration DIP switch must be set to Local Extender Mode
2.1
Section 2 Getting Started
the Extender488/HS Bus Extender connected to the Local bus) or Remote
(for
Extender Mode (for the Extender488/HS Bus Extender connected to the Remote bus).
When both units are on, the Local bus extender will monitor all local bus
activity and transmit this activity to the Remote bus extend er. All activity d etected b y
the Remote bus extender is also communicated back to the Local bus extender.
WARNING
Never open the Extender488/HS Bus Extender case while it is
connected to the AC line. Failure to observe this warning may
result in equipment failure, personal injury or death.
Not Used
1
0
12345678
Remote Extender
Mode
Not Used
1
0
12345678
Local Extender
Mode
Extender488/HS Configuration Selection
Note: Factory default setting is REMOTE
.
Switch
Side
View
DOT
2.2
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