NOTE
This manual documents the Model 112OA IEEE-488 Translator and its
assemblles at the revision levels shown in Appendix 7A. If your
Instrument contelns assemblies with different revision letters, it will be
necessary for you to etther update or backdate this manual. Refer to the
supplemental change/errata sheet for newer assemblies, or to the
backdating sheet in Appendix 7A for older assemblies.
1120A
P/N 487520
October 1978
IEEE-488
Translator
Instruction Manual
The Fluke Corporation is pleased to hereby grant GIDEP
(Government-Industry Data Exchange Program) permission to reproduce
the manuals listed in the attachment. Permission is granted on the
condition that you legibly reproduce on the copies the legend “Reproduced
With Permission”.
It is our understanding from your request dated January 23,2001,
that the purpose for copying these manuals is to include them in the GIDEP
database, and that the material won’t be copied for any other purpose.
Thank you for your cooperation, and for your interest in Fluke.
Sincerely,
Beverly A. Summers
Paralegal
Fluke Corporation
Intellectual Property Law Dept.
Direct: (425) 446-5770 [voice]
(425) 446-5117 [fax]
beverly.summers@fluke.com [e-mail]
WARRANTY
Notwithstanding any provision of any agreement the following warranty is exclusive:
The JOHN FLUKE MFG. CO., INC., warrants each instrument it manufactures to be free from defects in material and
workmanshrp under normal use and service for the period of I-year from date of purchase. This warranty extendsonly
to the original purchaser. This warranty shall not apply to fuses, disposable batteries (rechargeable type batteriesare
warranted for go-days), or any product or parts which have been subject to misuse, neglect, accident, or abnormal
conditions of operations.
In the event of failure of a product covered by this warranty, John Fluke Mfg. Co., Inc., will repair and calibrate an
instrument returned to an authorized Service Facility withm 1 year of the original purchase; provided the warrantor’s
examination discloses to its satisfaction that the product was defective. The warrantor may, at its option, replace the
product in lieu of repair. With regard to any instrument returned within 1 year of the original purchase, said repairs or
replacement will be made without charge. If the failure has been caused by misuse, neglect, accident, or abnormal
conditions of operatrons, repairs will be billed at a nominal cost. In such case, an estimate WIII be submitted before
work is started, if requested.
THE FOREGOING WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS,
OR ADEQUACY FOR ANY PARTICULAR PURPOSE OR USE. JOHN FLUKE MFG. CO., INC., SHALL
NOT BE LIABLE FOR ANY SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER IN
CONTRACT, TORT, OR OTHERWISE.
If any failure occurs, the following steps should be taken:
1. Notify the JOHN FLUKE MFG. CO., INC , or nearest Service facility, giving full details of the difficulty, and
include the model number, type number, and serial number. On receipt of this information, service data, or
shipping instructions will be forwarded to you.
2. On receipt of the shipping instructions, forward the instrument, transportation prepaid. Repairs will be
made at the Service Facility and the instrument returned, transportation prepaid.
SHIPPING TO MANUFACTURER FOR REPAIR OR ADJUSTMENT
All shipments of JOHN FLUKE MFG. CO., INC., instruments should be made via United Parcel Serviceor”Best Way”’
prepaid. The instrument should be shipped in the original packing carton; or if it is not available, use any suitable
container that is rigid and of adequate size. If a substitute container IS used, the instrument should be wrapped in paper
and surrounded with at least four inches of excelsior or similar shock-absorbing material.
CLAIM FOR DAMAGE IN SHIPMENT TO ORIGINAL PURCHASER
The instrument should be thoroughly inspected immediately upon original delivery to purchaser. All material in the
container should bechecked againsttheenclosed packing list. The manufacturerwill not be responsible for shortages
against the packing sheet unless notified immediately. If the instrument is damaged in anyway, aclaim should be filed
with the carrier immediately. (To obtain a quotation to repair shrpment damage, contact the nearest Fluke Technical
Center.) Final claim and negottations with the carrier must be completed by the customer
The JOHN FLUKE MFG. CO., INC, will be happy to answer all applrcations or use questions, which will enhance your
use of this instrument. Please address your requests or correspondence to: JOHN FLUKE MFG. CO., INC., P.O. BOX
C9090, EVERETT, WASHINGTON 98206, ATTN: Sales Dept. For European Customers: Fluke (Holland) B.V., P.O. Box
5053, 5004 EB, Tilburg, The Netherlands.
*For European customers, Air Freight prepaid
John Fluke Mfg. Co., Inc., P.O. Box C9090, Everett, Washington 98206
Rev. 6/81
CERTIFICATE of CALIBRATION
John Fluke Mfg. Co., Inc. certifies that this instrument has been
calibrated using standards and instruments which are traceable
to the National Bureau of Standards, or to nationally accepted
measuring systems. The standards and instruments used in the
calibration are supported by a calibration system which meets or
exceeds the requirements of MIL-C-45662A. The reference
standards which support this calibration system are calibrated
on a schedule which is adjusted to maintain traceability at the
required accuracy level. NBS Test Report numbers, or copies of
these reports, can be obtained by contacting:
Standards Laboratory MS 169-G
John Fluke Mfg. Co., Inc.
P.O. Box C9090
Everett, Wa 98206
Form No. A636 R ev. 6 3182
Les Huntley
Metrology Assurance Manager
Corporate Quality Assurance Group
l
CHANCE/ERRATA INFORMATION
ISSUE NO: 2
9179
This change/errata contains information necessary to ensure the
accuracy of the following manual. Enter the corrections in the
manual if either one of the following conditions exist:
The revision letter
1.
stamped on the indicated PCB is equal
to or higher than that given with each change.
2. No revision letter is indicated at the beginning of the
change/errata.
MANUAL
Title: 1120A IEEE-488 TRANSLATOR
Print Date: October 1978
Rev. and Date:
--w---
C/E PAGE EFFECTIVITY
Page No. Print Date
1
2
4/79
9/79
.
ERRATA #l
On page 5-3, Table 5-l:
ADD : Fl-EIFuse,
IFuse,
I Fuse,
Europeanlorderlforlapplicable
Slo-Blo,
Slo-Blo,
1/4A (100/12OV source115051721895361505172
1/8A (200/24OV source114672331895361467233
1120A
source!1
ADD: XFl-EIFuse Cover,
ERRATA #2
On page vi,
change the figure title:
FROM: Frontispiece
TO: l120A IEEE-488 Translator
On page v,
FROM:
TO:
change the heading:
Frontispiece
1120A IEEE-488 Translator
On page 3-3, Table 3-l:
Where horizontal line
FHOM: X TO: 0
Where horizontal line "DAB" intersects
change, k'ROM: I.6 TO: 1,6,7
Where horizontal line "EOS" intersects vertical line aATN1l change
PROM: X TO: 0
Change FROM: Mnemonic "GEL" TO: "GTL"
European14610201895361461020
IIDAB" intersects vertical line "ATN" change,
vertical line
“NOTES”
Where horizontal line IIIFC” intersects vertical line "IFC" change
YROM: X TO: 1
Where horizontal line
"IFC" intersects vertical line "REN" change
FROM: 1 TO: X
Uhere horizontal line I'NLJLI' intersects vertical line IIATN" change
FROM: X TO: 0
Where horizontal line " N U L " intersects
vertical line "NOTES"
change ADD: 7
Where horizontal line VIRQS” intersects vertical line “ATN" change
FROM: X TO: 0
Where horizontal line “STB” intersects vertical line "ATN" change
FHUM: X TO: 0
On page 3-4, Table 3-2:
The ASCII character for octal number 140 should be I’ :. ” (accent).
Change octal number k-ROM: 118 TO: 120
lf20A
On page
FROM:
3-6,
pat-a.
EOI and Am are both false.
3-24, change line
3
as follows:
TO: EOI and Am are both true.
On page 4-2, para. 4-14:
ADD:
"Remove top cover" to the end of Step 2.
Un page 4-4, Table 4-1, change Step 5:
FROM:
TO:
Connect ac supply. Press power ON.
Connect ac supply. DO NOT PRESS POWER TO ON.
Remove the word: "cap" from Step 6.
On Step 13:
Under YES column change FROM: 14 TO: 15
Under NO column change FROM: blank TO: 14
On Step 28:
FROM:
close power switch on front panel
TO: press front panel POWER switch to ON
On page 3-3, Table 3-l:
Where horizontal line "END" intersects vertical line "ATN" change
FROM: X TO: 0
CHANtiE #l - 12526
Un page 5-3:
FROM:
TO: H14IScrew, FHP,
H14iScFew, FHP,
6-32 X l/21114397189536111439711
6-32 X l/2115217317373411909611
ERRATA Uj
On page 5-3:
FROM: A3;IEEE PCB Assy (1120A-4003T)1476465~$9536~476465~ 1
TO: A3;IEEE PCB Assy (1120A-4003T>1480368~89536811
Un page 5-7:
FROM: AllMain PCB Assy (1120A-4001)
TO: AllMain PCB Assy (1120A-4001T)1476432(895361476432~REF
On page 5-9:
FROM: A2iFront Panel PCB Assy (1120A-4002T)
TO : AZlFront Panel PCB Assy (1120A-4002T)
4764991895361476499
On page 5-10:
FROM: A3;IEEE PCB Assy (1120A-4003)
TO:
A31IEEE PCB Assy (112UA-4003Tj1476465
8953614764651REF
ChANtiE #Z - 12'1tr7
liev.- C,
Al Main PCB Assy (1120A-4001)
On page 5-3:
FROM: H7IWasherlllU3Y518Y536111039511
TO: H71Washer1110403173734~l3O2~ 1
FROM: HY1Screw, 6-32 X 3/81177022189536;17702212
TO: HY!ScFew,
6-32 X 1/2117703U;895361177030~2
;REF
Y/‘IY
2
1120A
Table of Contents
SECTION
1
2
3 THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
lNTRODUCTlONANDSPEClFlCATlONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . l-l
I-I.
I-4.
1-I 1. SPEClFlCATlONS ............................................ l-1
OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2-l.
2-3.
2-6.
2-7.
2-10.
2-12.
2-15.
2-17.
2-2 I.
7-3-j
i i_
2-27.
2-29.
3-l.
3-3.
3-5.
3-7.
3-1 I.
3-14.
SIX.
3-20.
3-22.
INTRODCCTION ............................................. l-1
DESCRIPTION ...............................................
IN1 RODUCTIOI’ . . . . . . . . . . . .
SHfPPING IXF-OKMAPION . . . . . . . . .
INSTALLATION . . . . . . . . . . . . . . . . . . .
Interface PCB Assembly Installation . .
lnput Power . . . . . . . . . . . . . . . . . . .
Case Mating . , . . . . . . . . . . . . . . , . . .
IEEE-488 Bus Connections . . . . . . . . .
IEEE Bus Restrictions . . . . , . . . . . . . . .
Connection to the Interfaced Instrument
Addressing . . . . . . . . . . . . . . . . . . .
OPERATlNCi FEATURES . . . . . . . . . . .
OPERATING DIRECTIONS . . . . . . .
IN TRODUCTfON ..... , ..................
OC’ERALL FUNC‘r10~.41. DESCRfPTlON
Address ................................
IEEE Bus ........................... . ..
Bus .I ransceivers ........................
Interface Assembly ......................
CIKCUIT DESCKIPTfOh’ .................
f’ower SuppI!, ..........................
Circuit Control ......... , ...............
TITLE PAGE
. .
.
.
. .
. .
. .
. .
. .
.
. .
.
.
. .
.
. .
. .
. .
. .
. .
.
. .
. .
. .
. .
. .
. .
. .
. .
. .
. .
. .
. .
. .
. .
. .
.
.
. .
.
. .
. .
1-l
. ,
. 2-l
. 2-I
. .
. 2-l
.
. .
. 2-l
. 2-1
. 2-l
. 2-2
. 2-2
. .
. 2-3
. 2-3
. .
. 2-3
. *
. 2-3
3-1
3-l
3-1
3-l
3-l
3-5
3-5
3-5
3-6
3-6
1120A
TABLE OF CONTENTS, continued
SECTION
4 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
TITLE
PAGE
4-l.
4-3. SERVICE INFORMATION
4-6. GENERAL MAINTENANCE
4-7.
4-9.
INTRODUCTION .............................................
.................................... 4-1
...................................
Line Voltage Selection
........................................
Fuse Replacement ............................................
4-11. Cleaning ....................................................
4-13.
4-15.
Instrument Disassembly
Front Panel Assembly Removal
4-17. Interface PCB Assembly Installation and Removal
4-19. PERFORMANCE TEST
....................................... 4-2
................................ 4-2
............... 4-3
....................................... 4-3
4-22. CALIBRATION ...............................................
4-24. TROUBLESHOOTING
5
LIST OF REPLACEABLE PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
.........................................
TABLE OF CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
OPTION AND ACCESSORY INFORMATION
. . . . . . . . . . . . . _. . . . . . . . . . . . . 6-1
4-1
4-1
4-1
4-1
4-2
4-3
4-3
5-l
TABLE OF CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
7 GENERAL INFORMATION f....,...................................... 7-l
7A MANUAL CHANGE INFORMATION
6 SCHEMATIC DIAGRAMS . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ,
. . . . . . . , . . , . . . . . . . . , . . . . . . . . . _. . . . . 7A-’
8-1
TABLEOF CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
1120A
List of Tables
TABLE
l-l.
1-2.
2-1.
2-2.
3-1.
3-2.
4-l.
1120A Accessories ................
Specifications
Addressing
Controls, Indicators, and Connectors
Remote Message Coding ...........
ASCII Character Set ..............
I l20A Troubleshooting
....................
.......................
............
TITLE
.......
.......
.......
.......
.......
.......
.......
. .
. .
. .
. .
. .
. .
. .
. .
. .
. .
. . . . .
. . . . .
. . . .
. . . . .
. . . . .
. . . . .
. . . . .
. .
. .
. .
. .
. .
. . . . .
. . . . .
. . . . .
. . . . .
. . . .
. .
. .
. .
PAGE
. 1-I
. l-2
2-3
. 2-5
. 3-3
. 3-4
. 4-4
iii/iv
List of Illustrations
FIGURE TITLE PAGE
2-l.
2-2.
2-3.
2-4.
3-l.
3-2.
3-3.
3-4.
4-1.
Frontispiece ..................................
Instrument Case Mating ........................
Rear Panel Connections ........................
Lnterface System Connections ...................
Controls, Indicators and Connections
1 l2OA Functional Block Diagram ...............
IEEE Bus Connections .........................
interface Functional Block Diagram
I120A Simplified Schematic ....................
Maintenance Locations and Line Voltage Switching
............
.............
. .
. .
. .
. .
.
.
.
. .
.
. .
. .
. .
. .
vi
2-2
2-2
2-2
2-4
3-l
3-2
3-5
3-6
4-2
1120A
1120A
Frontispiece
vi
-,
1120A
Section 1
Introduction & Specifications
l-l. INTRODUCTION
1-2. The Model 1120A IEEE-488 Translator is a device
for interfacing various Fluke measurement instruments
to the IEEE bus. This instrument consists of software
translators capable of bidirectionally converting data
and codes between the IEEE bus and measurement
instruments, and a mainframe to hold and power the
software translators. Software translation is
accomplished on the Interface PCB Assembly; one, two
or three of these assemblies may be plugged into an
1120A mainframe. The Interface PCB Assembly will be
briefly described in this manual and detailed in Section 6
of the Instruction Manual for the specific measurement
instrument it interfaces to the bus. The 1120A IEEE-488
Translator mainframe is described in this manual.
l-3. The Model 1120A IEEE-488 Translator has been
designed in accordance with IEEE STANDARD
DIGITAL INTERFACE FOR PROGRAMMABLE
INSTRUMENTATION published by the Institute of
Electrical and Electronics Engineers, Inc., 345 East 47th
Street, New York, NY 10017.
1-4. DESCRIPTION
l-5. The 1120A mainframe provides all physical and
electrical support for up to three Interface PCB
Assemblies.
1-6. The I120A features a standard Portable Test
Instrument case. Other Fluke instruments using these
cases may be easily stacked, attached and interconnected
to form portable, bench-type test systems.
I-8. With the exception of bus transceivers, each
Interface PCB Assembly possesses full interfacing
capability. Bus Transceivers are provided on the 1120A
Main PCB. The three plug-in Interface positions on the
1120A Main PCB provide identical interfacing support.
l-9. Each Interface PCB Assembly is easily addressed
from a controller on the IEEE bus.
I-10. Refer to Table l-l for a list of available
accessories for the 1120A. Section 6 of this manual
provides information on these accessories.
l-11. SPECIFICATIONS
l-12. Specifications for the 1120A, IEEE-488
Translator are given in Table l-2.
Table l-l. 1120A Accessories
MODEL NO. NAME
Y2014 C Size Single Unit Offset Rack Mount
Y2015 C Size Dual Unit Rack Mount
Y2020 C Size Panel Mount
Y7202 Instrument Cable, 2 ft.
Y7203 Instrument Cable, 5 ft.
Y8001 IEEE Standard Cable, 1 Meter
Y8002 IEEE Standard Cable, 2 Meters
Y8003 IEEE Standard Cable, 4 Meters
l-7. Field installable Interface PCB Assemblies are
available as options to several Fluke measurement
instruments.
l-l
1120A
DIMENSIONS
Size:
Weight
(without Interface Assemblies):
OPERATING POWER
Input Voltage
1oov
12ov
220v
240V
Input Power:
SHOCK AND VIBRATION:
OPERATING TEMPERATURE:
HUMIDITY
Storage:
Operating:
INTERFACE FUNCTIONS:
10.49 cm H x 32.64 cm L x 20.45 cm D
4.13 in H x 12.85 in L x 8.05 in D
2.55 kg (5 tbs. 10 oz.)
Frequency
47-63 Hz
22.3W maximum
Meets requirements of MI L-T-28800C
0 to 50°C ambient
95%
70%
The 1120A will support the following IEEE-488 Interface Functions:
INTERFACE FUNCTION
Source Handshake
Acceptor Handshake AH
Talker or Extended Talker TorTE
Listener or Extended Listener Lor LE
Service Request SR
Remote Local
Parallel Poll PP
Device Clear DC
Device Trigger DT
Controller C
SYMBOL CAPABILITY
SH
RL
FULL
FULL
FULL
FULL
FULL
FULL
PPO
FULL
FULL
co
l-2
Some semiconductors and custom IC’s can be
damaged by electrostatic discharge during
handling. This notice explains how you can
minimize the chances of destroying such devices
by:
1. Knowing that there is a problem.
Learning the guidelines for handling them.
2.
3. Using the procedures, and packaging and
bench techniques that are recommended.
The Static Sensitive (S.S.) devices are identified in
The following practices should be followed to minimize damage to S.S. devices.
1. MINIMIZE HANDLING
the Fluke technical manual parts list with the symbol
3. DISCHARGE PERSONAL STATIC
BEFORE HANDLING DEVICES
KEEP PARTS IN ORIGINAL CONTAINERS
2.
UNTIL READY FOR USE.
4. HANDLE S.S. DEVICES BY THE BODY
Page 1 of 2
5. USE ANTI-STATIC CONTAINERS FOR
HANDLING AND TRANSPORT
6. DO NOT SLIDE S.S. DEVICES OVER
ANY SURFACE
8. WHEN REMOVING PLUG-IN ASSEMBLIES,
HANDLE ONLY BY NON-C6NDUCTIVE
EDGES AND NEVER TOUCH OPEN EDGE
CONNECTOR EXCEPT AT STATIC-FREE
WORK STATION. PLACING SHORTING
STRIPS ON EDGE CONNECTOR USUALLY
PROVIDES COMPLETE PROTECTION TO
INSTALLED SS DEVICES.
9. HANDLE S.S. DEVICES ONLY AT A
STATIC-FREE WORK STATION
7. AVOID PLASTIC, VINYL AND STYROFOAM@
IN WORK AREA
PORTIONS REPRINTED
WITH PERMISSION FROM TEKTRONIX, INC.
AND GENERAL DYNAMICS, POMONA DIV.
e Dow Chemical
Page 2 of 2
10. ONLY ANTI-STATIC TYPE SOLDERSUCKERS SHOULD BE USED.
11. ONLY GROUNDED TIP SOLDERING
IRONS SHOULD BE USED.
Anti-static bags, for storing S.S. devices or pcbs
with these devices on them, can be ordered from the
John Fluke Mfg. Co., Inc.. Seesection 5 in any Fluke
technical manual for ordering instructions. Use the
following part numbers when ordering thesespecial
bags.
John Fluke Part No.
453522
453530
453548
454025
Pink Poly Sheet
3O”x6O”x60 Mil
P/N RC-AS-1200
$20.00
J0089B-07U7810/SE EN
Description
6” X 8”
Bag
8” X 12”
16” X 24”
12” X 15”
Wrist Strap
P/N TL6-60
$7 .oo
Bag
Bag
Bag
Litho in U.S.A.
1120A
Section 2
Operating Instructions
2-1. INTRODUCTION
2-2. Installation and operation of the Model 1120A
IEEE-488 Translator is explained in this section. Read
this information before attempting to operate the unit.
Should any difficulties arise, contact your nearest Fluke
Sales Representative (list in Section 7) or the John Fluke
Mfg. Co., Inc. (P.O. Box 43210, Mountlake Terrace,
WA, 98043; tel. 206 774-221 I).
2-3. SHIPPING INFORMATION
2-4. The 1120A is packaged and shipped in a foampacked container. Upon receipt of the instrument, a
thorough inspection should be made to reveal any
possible shipping damage. Special instructions for
inspection and claims are included with the shipping
container.
2-5. If reshipment is necessary, the original container
should be used. If the original container is not available, a
new container can be obtained from John Fluke Mfg.
Co., Inc. Please reference the instrument model number
(1120A) when requesting a new shipping container.
2-6. INSTALLATION
2-7. Interface PCB Assembly Installation
2-8. Installation of the Interface PCB Assemblies
necessitates removal of the 1120A’s top cover. Do not
remove the cover at this time.
2-9. Refer to Instrument Disassembly and Interface
PCB Assembly Installation in Section 4 of this manual
for correct procedures, then return to this section for
further INSTALLATION procedures.
2-10. Input Power
2-l 1. Line power is connected to the 1120A via a rear
panel three-prong connector and power cord. the offset
prong on this connector should be attached through the
power cord to a high quality earth ground. Refer to
Section 4 of this manual for line voltage selection and
fuse replacement instructions.
2-12. Case Mating
2-l 3. The 1120A is housed in a special molded plastic
instrument case. Measurement instruments connected to
the IEEE-488 bus via the 1120A are usually packaged in
similar cases. These rugged cases feature non-marring
feet and a tilt down bail. The cases are compatible,
regardless of size; they can be stacked vertically (as
illustrated in Figure 2-l) and latched together to form
portable test systems. Instrument stacks should be
limited to a total height of three feet and a total weight of
40 pounds.
2- 14. Use the following procedure when attaching PTIencased instruments:
CAUTION
Hazardous voltage may be present when the
1120A’s top cover is removed. installation of
the Interface PCB Assemblies should be
performed by qualified personnel only.
For the top instrument, pull out latches found
1.
on either side of the instrument.
2. Nestle top and bottom instrument together.
3. Push latches in to secure instruments together.
2-l
1120A
INSTRUMENT
#3
Figure 2-I. Instrument Case Mating
- -_.
2-15. IEEE-488 Bus Connections
2-16. The IEEE bus and measurement instrument
connections to the 1120A’s rear panel can be seen in
Figure 2-2. Figure 2-3.
connection of the 1120A, interfaced instruments, and
other devices on the IEEE-488 bus. The IEEE cable
attaches to the 1EEE connector, located in the middle of
the rear panel (item A in Figure 2-2). This connector
mates with standard 24 conductor IEEE cables.
The IEEE connector is designed to receive
IEEE cables with metric threaded securing
screws only.
then illustrates a system’s
NOTE
1120A
IEEE488
TRANSLATOR
Figure 2-3. Interface System Connections
L&i’
h
Y DATA
uu
2-17. IEEE Bus Restrictions
2-18. IEEE-488 bus interconnections are confined
within the following limitations:
1. No more than 15 devices may be connected in a
single IEEE bus system.
2-2
Figure 2-2. Rear Panel Connections
2.
The total length of cable used in one IEEE bus
system must not exceed 20 meters.
3.
The total length of cable must also not exceed 2
meters times the number of devices in the system.
2-19. Combinations of 1, 2, or 4 meter IEEE cables can
be used to meet the cable length restrictions. For
example, when connecting a controller to one 1120A, a 1,
2. or 4 meter cable may be used (2 meters times two
devices = 4 meters). When connecting more than IO
devices, a combination of 1, 2, or 4 meter cables can
be
used (not to equal more than 20 meters). Available cables
are
listed
in Table l-l.
2-20. IEEE Cables may be interconnected in any
desired configuration. Total cable length is the only
Loading...