National Instruments GPIB-120A Appendix B Specifications

© National Instruments Corporation B-1 GPIB-120A User Manual

Appendix BSpecifications

This appendix lists the specifications of the GPIB-120A.

Table B-1. System Configuration

Configuration Specification

Loading per expansion Up to 14 additional devices

GPIB driver output circuit and T1 timing

of source device No restrictions

Note: T1 is the data settling time (DIO valid to DAV) and varies according to the type

of drivers and the system configuration used.

Table B-2. Performance Characteristics

Characteristic Specification

Data transfer rate degradation 250 ns per byte, typical

Propagation delay

All signals except DAV

DAV (first byte)

DAV (subsequent bytes)

140 ns typical for signal assertion edge

180 ns typical for signal unassertion edge

200 ns maximum

2.5 µs typical for signal assertion edge

180 ns typical for signal unassertion edge

140 ns typical for signal assertion edge

180 ns typical for signal unassertion edge

200 ns maximum

Transfer Rate

Read from isolated GPIB instrument

Write to isolated GPIB instrument

GPIB commands to isolated GPIB instrument

800 kbytes/s maximum

800 kbytes/s maximum

320 kbytes/s maximum

Contents

Main Page Limited Warranty Copyright Trademarks WARNING REGARDING MEDICAL AND CLINICAL USE OF NATIONAL INSTRUMENTS PRODUCTS FCC/DOC Radio Frequency Interference Compliance Federal Communications Commission Canadian Department of Communications Instructions to Users Danger Contents Page About This Manual Organization of This Manual Conventions Used in This Manual Page Chapter 1 Introduction Description of the GPIB-120A Page What You Need to Get Started Optional Equipment Unpacking Your GPIB-120A Chapter 2 Connection Isolation Considerations Placing Your Instruments Connecting the GPIB-120A Connecting to Hewlett-Packard Controllers Mounting the GPIB-120A Chapter 3 Theory of Operation Circuitry of the GPIB-120A The GPIB-120A Front Panel Power On System Controller Detection Active Controller Detection Source Handshake Detection Data Direction Control Parallel Poll Detection Acceptable Identification Codes Appendix A Operation of the GPIB History of the GPIB GPIB Operation Types of Messages Talkers, Listeners, and Controller The Controller-In-Charge and System Controller GPIB Signals and Lines Page Appendix A Operation of the GPIB National Instruments Corporation A-5 GPIB-120A User Manual Physical and Electrical Characteristics Figure A-1. GPIB Connector and the Signal Assignment Page Page Configuration Restrictions: The Role of Expanders and Extenders Related Document Appendix B Specifications Page Page Multiline Interface Messages Hex Oct Dec ASCII Msg Hex Oct Dec ASCII Msg Message Definitions Multiline Interface Messages Hex Oct Dec ASCII Msg Hex Oct Dec ASCII Msg Appendix D Customer Communication Technical Support Form ___________________________________________________ GPIB-120A Hardware and Software Configuration Form Documentation Comment Form Glossary ___________________________________________________