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National Instruments GPIB-120A manual

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Table of contents for the manual

  • Page 1

    © Copyright 1991, 1994 National Instruments Corporation. All Rights Reserved. GPIB-120A User Manual October 1994 Edition Part Number 3 7 0 893A -01[...]

  • Page 2

    National Instruments Corporate Headquarters 6504 Bridge Point Parkway Austin, TX 78730-5039 (512) 794-0100 Technical support fax: (800) 328-2203 (512) 794-5678 Branch Offices: Australia (03) 879 9422, Austria (0662) 435986, Belgium 02/757.00.20, Canada (Ontario) (519) 622-9310, Canada (Québec) (514) 694-8521, Denmark 45 76 26 00, Finland (90) 527 [...]

  • Page 3

    Limited Warranty The GPIB-120A is warranted against defects in materials and workmanship for a period of two years from the date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace equipment that proves to be defective during the warranty period. This warranty includes parts and [...]

  • Page 4

    FCC/DOC Radio Frequency Interference Compliance This equipment generates and uses radio frequency energy and, if not installed and used in strict accordance with the instructions in this manual, may cause interference to radio and television reception. This equipment has been tested and found to comply with the following two regulatory agencies: Fe[...]

  • Page 5

    Danger The GPIB-120A does not generate high voltages; however, you must use extreme caution if your system or application can cause high voltages on the shield or logic ground of the GPIB cable you attach to the electrically isolated connector (GPIB Port B) located on the rear panel of the GPIB-120A. Many GPIB cables use a metal shell to enclose th[...]

  • Page 6

    © National Instruments Corporation v i i GPIB-120A User Manual Contents About This Manual ...............................................................................................................i x Organization of This Manual ...........................................................................................i x Conventions Used in T[...]

  • Page 7

    Contents GPIB-120A User Manual v i i i © National Instruments Corporation NDAC (Not Data Accepted) ........................................................A -3 DAV (Data Valid) ........................................................................A -3 Interface Management Lines ....................................................................[...]

  • Page 8

    © National Instruments Corporation i x GPIB-120A User Manual About This Manual This manual describes how to use the National Instruments GPIB-120A bus expander/isolator. Organization of This Manual This manual is organized as follows: • Chapter 1, Introduction , contains a description of the GPIB-120A, lists what you need to get started and opti[...]

  • Page 9

    About This Manual GPIB-120A User Manual x © National Instruments Corporation Related Documentation The following document contains information that you may find helpful as you read this manual. • ANSI/IEEE Standard 488.1-1987, IEEE Standard Digital Interface for Programmable Instrumentation Customer Communication National Instruments wants to re[...]

  • Page 10

    © National Instruments Corporation 1 -1 GPIB-120A User Manual Chapter 1 Introduction This chapter contains a description of the GPIB-120A, lists what you need to get started and optional equipment you can order, and explains how to unpack the GPIB-120A. Description of the GPIB-120A The GPIB-120A is a high-speed bus expander/isolator with the follo[...]

  • Page 11

    Introduction Chapter 1 GPIB-120A User Manual 1 -2 © National Instruments Corporation Printer (Listener) Multimeter (Talker and Listener) Signal Generator (Listener) Computer (Controller, Talker, and Listener) Unit Under Test GPIB Figure 1-2. Typical GPIB-120A Extension System (Logical Configuration) With the GPIB-120A, it is possible to overcome t[...]

  • Page 12

    Chapter 1 Introduction © National Instruments Corporation 1 -3 GPIB-120A User Manual What You Need to Get Started One of the following GPIB-120A Bus Expanders/Isolators: GPIB-120A (100 to 120 VAC) GPIB-120A (220 to 240 VAC) 2.2 m, 125 VAC Power Cord (When connected to a power source, this cord connects the equipment chassis to power ground.) Optio[...]

  • Page 13

    © National Instruments Corporation 2 -1 GPIB-120A User Manual Chapter 2 Connection This chapter contains information for connecting your GPIB-120A. Danger: The GPIB-120A does not generate high voltages; however, you must use extreme caution if your system or application can cause high voltages on the shield or logic ground of the GPIB cable you at[...]

  • Page 14

    Connection Chapter 2 GPIB-120A User Manual 2 -2 © National Instruments Corporation Placing Your Instruments Identify the instruments or devices in your system that are sensitive to ground loop noise. In the next section, Connecting the GPIB-120A , you will connect these instruments or devices to Bus B of your GPIB-120A. Then, you will connect the [...]

  • Page 15

    © National Instruments Corporation 3 -1 GPIB-120A User Manual Chapter 3 Theory of Operation This chapter describes the operational theory of the GPIB-120A. This chapter assumes that you have a basic knowledge of the GPIB. If you are a first-time user or you would like to review the basics, refer to Appendix A, Operation of the GPIB , for a history[...]

  • Page 16

    Theory of Operation Chapter 3 GPIB-120A User Manual 3 -2 © National Instruments Corporation The circuitry on each side of the expansion monitors local GPIB states and converts the signals monitored into X signals (for transmit) which drive the R signals (for receive) on the opposite side of the expansion. The X signals are optically isolated from [...]

  • Page 17

    Chapter 3 Theory of Operation © National Instruments Corporation 3 -3 GPIB-120A User Manual If a GPIB device on Bus A asserts DAV, the Bus A Source Handshake state becomes true and the Bus B Source Handshake state becomes false. If a GPIB device on Bus B asserts DAV, the Bus B Source Handshake state becomes true and the Bus A Source Handshake stat[...]

  • Page 18

    Theory of Operation Chapter 3 GPIB-120A User Manual 3 -4 © National Instruments Corporation Acceptable Identification Codes Bus A and Bus B of the GPIB-120A are each capable of appearing as a GPIB device having the GPIB capabilities listed in Table 3-1. For a complete description of each code, consult the ANSI/IEEE Standard 488.1-1987, IEEE Standa[...]

  • Page 19

    © National Instruments Corporation A -1 GPIB-120A User Manual Appendix A Operation of the GPIB This appendix contains a brief history of the GPIB and describes the operation of the GPIB. History of the GPIB The original GPIB was designed by Hewlett-Packard (where it is called the HP-IB) to connect and control programmable instruments manufactured [...]

  • Page 20

    Operation of the GPIB Appendix A GPIB-120A User Manual A -2 © National Instruments Corporation Talkers, Listeners, and Controller There are three types of GPIB communicators: Talkers, Listeners, and Controllers. A Talker sends data messages to one or more Listeners. The Controller manages the flow of information on the GPIB by sending commands to [...]

  • Page 21

    Appendix A Operation of the GPIB © National Instruments Corporation A -3 GPIB-120A User Manual GPIB Signals and Lines The interface system consists of 16 signal lines and 8 ground return or shield drain lines. The 16 signal lines are divided into the following three groups. • Eight data lines • Three handshake lines • Five interface manageme[...]

  • Page 22

    Operation of the GPIB Appendix A GPIB-120A User Manual A -4 © National Instruments Corporation Interface Management Lines Five lines are used to manage the flow of information across the interface. ATN (Attention) The Controller drives ATN true when it uses the data lines to send commands and false when it allows a Talker to send data messages. IF[...]

  • Page 23

    Appendix A Operation of the GPIB © National Instruments Corporation A -5 GPIB-120A User Manual Physical and Electrical Characteristics Devices are usually connected with a cable assembly consisting of a shielded 24 conductor cable with both a plug and receptacle connector at each end. With this design, devices can be linked in either a linear conf[...]

  • Page 24

    Operation of the GPIB Appendix A GPIB-120A User Manual A -6 © National Instruments Corporation Figure A-2. Linear Configuration of the GPIB Devices[...]

  • Page 25

    Appendix A Operation of the GPIB © National Instruments Corporation A -7 GPIB-120A User Manual Figure A-3. Star Configuration of the GPIB Devices[...]

  • Page 26

    Operation of the GPIB Appendix A GPIB-120A User Manual A -8 © National Instruments Corporation Configuration Restrictions: The Role of Expanders and Extenders To achieve the high data transfer rate for which the GPIB is designed, the physical distance between devices and the number of devices on the bus are limited. The following restrictions are [...]

  • Page 27

    © National Instruments Corporation B -1 GPIB-120A User Manual Appendix B Specifications 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[...]

  • Page 28

    Specifications Appendix B GPIB-120A User Manual B -2 © National Instruments Corporation Table B-3. Electrical Characteristics Characteristic Specification Isolation 60 V operating 1600 V breakdown Power supply selectable 90 to 130 VAC, 235 mA, (250 mA, 250 V, slow blow), 50 to 60 Hz or 180 to 260 VAC, 120 mA, (200 mA, 250 V, slow blow), 50 to 60 H[...]

  • Page 29

    © National Instruments Corporation C - 1 GPIB-120A User Manual Appendix C Multiline Interface Messages This appendix contains an interface message reference list, which describes the mnemonics and messages that correspond to the interface functions. These multiline interface messages are sent and received with ATN TRUE. For more information on the[...]

  • Page 30

    Multiline Interface Messages Appendix C GPIB-120A User Manual C - 2 © National Instruments Corporation Multiline Interface Messages He x Oc t Dec ASCII Msg He x Oc t Dec ASCII Msg 00 0 00 0 N UL 20 0 40 32 SP MLA0 01 0 01 1 S OH GTL 21 0 41 33 ! MLA1 02 0 02 2 STX 22 0 42 34 " MLA2 03 0 03 3 ETX 23 0 43 35 # MLA3 04 0 04 4 EOT SDC 2 4 04 4 36[...]

  • Page 31

    Appendix C Multiline Interface Messages © National Instruments Corporation C - 3 GPIB-120A User Manual Multiline Interface Messages He x Oc t Dec ASCII Msg He x Oc t Dec ASCII Msg 40 1 00 64 @ MTA0 60 14 0 96 ` MSA0,PPE 41 1 01 65 A MTA1 61 14 1 97 a MSA1,PPE 42 1 02 66 B MTA2 62 14 2 98 b MSA2,PPE 43 1 03 67 C MTA3 63 14 3 99 c MSA3,PPE 44 1 04 6[...]

  • Page 32

    © National Instruments Corporation D - 1 GPIB-120A User Man u al Appendix D Customer Communication For your convenience, this appendix contains forms to help you gather the information necessary to help us solve technical problems you might have as well as a form you can use to comment on the product documentation. Filling out a copy of the Techni[...]

  • Page 33

    Technical Support Form ___________________________________________________ Photocopy this form and update it each time you make changes to your software or hardware, and use the completed copy of this form as a reference for your current configuration. Completing this form accurately before contacting National Instruments for technical support help[...]

  • Page 34

    GPIB-120A Hardware and Software Configuration Form Record the settings and revisions of your hardware and software on the line located to the right of each item. Complete this form each time you revise your software or hardware configuration, and use this form as a reference for your current configuration. Completing this form accurately before con[...]

  • Page 35

    Documentation Comment Form National Instruments encourages you to comment on the documentation supplied with our products. This information helps us provide quality products to meet your needs. Title: GPIB-120A User Manual Edition Date: October 1994 Part Number: 370893A-01 Please comment on the completeness, clarity, and organization of the manual.[...]

  • Page 36

    © National Instruments Corporation G - 1 GPIB-120A User Manual Glossary ___________________________________________________ Prefix Meaning Value n - nano- 10 -9 µ - micro- 10 -6 m- milli- 10 -3 k - kilo- 10 3 M - mega- 10 6 ° degrees % percent A amperes A C alternating current ANSI American National Standards Institute ASCII American Standard Co[...]