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© Copyright 1991, 1994 National Instruments Corporation. All Rights Reserved. GPIB-120A User Manual October 1994 Edition Part Number 3 7 0 893A -01.
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.
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.
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.
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.
© National Instruments Corporation v i i GPIB-120A User Manual Contents About This Manual ...............................................................................................................i x Organization of This Manual .................
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 .
© 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.
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.
© 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.
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.
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.
© 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 voltag.
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.
© National Instruments Corporation 3 -1 GPIB-120A User Manual Chapter 3 Theory of Operation This chapter describes the operational theory of the GPIB-120A.
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.
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.
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.
© 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.
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.
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.
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.
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.
Operation of the GPIB Appendix A GPIB-120A User Manual A -6 © National Instruments Corporation Figure A-2. Linear Configuration of the GPIB Devices.
Appendix A Operation of the GPIB © National Instruments Corporation A -7 GPIB-120A User Manual Figure A-3. Star Configuration of the GPIB Devices.
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.
© National Instruments Corporation B -1 GPIB-120A User Manual Appendix B Specifications This appendix lists the specifications of the GPIB-120A. Table B-1.
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 Po.
© 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.
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.
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 6.
© 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.
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.
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.
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.
© 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 - .
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