IOtech Digital488 Bedienungsanleitung
Digital488 IEEE 488 to Digital Interface
INSTRUCTION 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.
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
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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.
Digital488
and
Digital488OEM
Instruction Manual
110-0920
Revision 4.2
November 1990
IOtech, Inc. ●25971 Cannon Road ●Cleveland, Ohio 44146 ●(440) 439-4091
Table of Contents
Section1 Introduction Page
1.1 General Description 1.1
1.2 Available Accessories1.2
1.3 Specifications 1.3
1.4 Abbreviations 1.5
Section 2 Getting Started Page
2.1 Inspection 2.1
2.2 Configuration 2.1
2.2.1 IEEE Address Selection 2.2
2.2.2 IEEE Bus Output Terminator Selection 2.3
2.3 Digital Input/Output Ports 2.4
2.3.1 Logic Levels 2.4
2.3.2 Digital I/O Port Pin Outs 2.4
2.3.3 Control Lines 2.6
2.3.3.1 Clear 2.6
2.3.3.2 Data Strobe 2.7
2.3.3.3 External Data Ready 2.7
2.3.3.4 Inhibit 2.8
2.3.3.5 Trigger 2.9
2.3.3.6 Service 2.9
2.4 IEEE 488 Bus Implementation 2.9
2.4.1 My Talk Address (MTA) 2.10
2.4.2 My Listen Address (MLA) 2.11
2.4.3 Device Clear (DCL and SDC) 2.11
2.4.4 Group Execute Trigger (GET) 2.11
2.4.5 Interface Clear (IFC) 2.12
2.4.6 Serial Poll Enable (SPE) 2.12
2.4.7 Serial Poll Disable (SPD) 2.12
2.4.8 Unlisten (UNL) 2.12
2.4.9 Untalk (UNT) 2.12
2.5 Installation 2.13
Section 3 Command Descriptions Page
Introduction 3.1
Bit Set (An) 3.2
Bit Clear (Bn) 3.3
Bus Input/Output (Gn) 3.4
Table of Contents
Section 3 Command Descriptions Page
Configure (Cn) 3.5
Data (D...Z) 3.6
Data Ready (Rn) 3.8
End or Identify (Kn) 3.9
Execute (X) 3.10
Format (Fn) 3.11
Handshake (Hn) 3.18
Inhibit (Qn) 3.19
Invert (In) 3.20
Port (Pn) 3.21
Service Request Mask (Mn) 3.22
Serial Poll Status Byte 3.24
Status (Un) 3.26
Terminator (Yn) 3.29
Test (T0) 3.30
Section 4 IEEE 488 Primer Page
4.1 History 4.1
4.2 General Structure 4.1
4.3 Send It To My Address 4.4
4.4 Bus Management Lines 4.4
4.4.1 Attention (ATN) 4.4
4.4.2 Interface Clear (IFC) 4.5
4.4.3 Remote Enable (REN) 4.5
4.4.4 End Or Identify (EOI) 4.5
4.4.5 Service Request (SRQ) 4.5
4.5 Handshake Lines 4.6
4.5.1 Data Valid (DAV) 4.6
4.5.2 Not Ready For Data (NRFD) 4.6
4.5.3 Not Data Accepted (NDAC) 4.6
4.6 Data Lines 4.7
4.7 Multiline Commands 4.7
4.7.1 Go To Local (GTL) 4.7
4.7.2 Listen Address Group (LAG) 4.8
4.7.3 Unlisten (UNL) 4.8
4.7.4 Talk Address Group (TAG) 4.8
4.7.5 Untalk (UNT) 4.8
Table of Contents
Section 4 IEEE 488 Primer Page
4.7.6 Local Lockout (LLO) 4.8
4.7.7 Device Clear (DCL) 4.8
4.7.8 Selected Device Clear (SDC) 4.9
4.7.9 Serial Poll Disable (SPD) 4.9
4.7.10 Serial Poll Enable (SPE) 4.9
4.7.11 Group Execute Trigger (GET) 4.9
4.7.12 Take Control (TCT) 4.9
4.7.13 Secondary Command Group (SCG) 4.9
4.7.14 Parallel Poll Configure (PPC) 4.10
4.7.15 Parallel Poll Unconfigure (PPU) 4.10
4.8 More On Service Requests 4.10
4.8.1 Serial Poll 4.11
4.8.2 Parallel Poll 4.11
Section 5 Service Information Page
5.1 Factory Service 5.1
5.2 Theory of Operation 5.1
5.3 Digital488 Mother Board Component Layout 5.3
5.4 Digital488 I/O Board Component Layout 5.4
5.5 Digital488OEM Component Layout 5.5
5.6 Digital488 Parts List 5.6
5.7 Digital488OEM Parts List 5.8
Appendix A Digital488 Command Summary
Appendix B IEEE Command and Address Messages
Appendix C Digital488OEM Mechanical Dimensions
Section 1 Introduction
1.1
Introduction
1.1 General Description
The Digital488 is a digital input and output interface to the IEEE 488 bus.
Each unit has 40 TTL level digital I/O lines, which are divided into 5 eight-bit ports.
Each port is software programmable as input or output. The Digital488OEM is a
board level interface with the same capabilities as the Digital488. All descriptions in
this manual refer to both products unless otherwise stated. When the model number
Digital488 is used in this manual, Digital488OEM is also implied.
The Digital488 has several features which give it versatile interface
capability. A trigger output signal is asserted on the Group Execute Trigger (GET)
command. Edge-triggered inputs can generate a Service Request on the bus. Six data
formats are software programmable, including ASCII hexadecimal, ASCII character,
ASCII binary, binary, high speed binary and ASCII decimal. There are also
individual bit set and bit clear commands. Programmable terminators are provided
to facilitate interfacing to various controllers.
A status mode enables the controller to interrogate the programmed status of
the Digital488 at any time. A self-test is initiated at power-on which checks for
proper RAM and ROM operation.
When addressed to talk, the Digital 488 will output data from all forty bits or
a selected 8 bit port. When addressed to listen, the unit will input data and
programming information from the controller, and output the data to the appropriate
I/O port.
Section 1 Introduction
1.2
1.2 Available Accessories
Additional accessories that can be ordered for the Digital488 include:
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 6 foot reverse entry IEEE 488 Cable
CA-8-50† 6 foot, 50 conductor ribbon cable with a card edge
connector on one end, the other end un-terminated.
CN-6-50† 50 Pin solder tab edge connector.
CN-20 Right Angle IEEE 488 adapter, male and female
CN-22 IEEE 488 Multi-tap bus strip, four female connectors in
parallel
CN-23 IEEE 488 panel mount feed-through connector, male
and female
110-0920 Additional Instruction Manual
Rack488-3† 5-1/4" by 19" rack mount for one Digital488
Rack488-4† 5-1/4" by 19" rack mount for two Digital488s
TR-2† 110 volt Wall mount power supply for the Digital488
TR-2E† 220 volt Wall mount power supply for the Digital488
TR-5 110 volt Wall mount power supply for the Digital488OEM
TR-5E 220 volt Wall mount power supply for the Digital488OEM
†For use with Digital488 Only
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