National Instruments GPIB-120B User Manual
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National Instruments GPIB-120B User Manual

National Instruments GPIB-120B User Manual

High-speed bus isolator/expander
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GPIB-120B User Manual
GPIB-120B User Manual
February 2019
371851C-01

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  • Page 1 GPIB GPIB-120B User Manual GPIB-120B User Manual February 2019 371851C-01...
  • Page 2 11500 North Mopac Expressway Austin, Texas 78759-3504 USA Tel: 512 683 0100 For further support information, refer to the NI Services appendix. To comment on NI documentation, refer to the NI website at and enter the Info Code ni.com/info feedback © 1999–2019 National Instruments. All rights reserved.
  • Page 3 National Instruments Corporation. National Instruments respects the intellectual property of others, and we ask our users to do the same. NI software is protected by copyright and other intellectual property laws. Where NI software may be used to reproduce software or other materials belonging to others, you may use NI software only to reproduce materials that you may reproduce in accordance with the terms of any applicable license or other legal restriction.
  • Page 4 ™ The ExpressCard word mark and logos are owned by PCMCIA and any use of such marks by National Instruments is under license. The mark LabWindows is used under a license from Microsoft Corporation. Windows is a registered trademark of Microsoft Corporation in the United States and other countries.
  • Page 5 Operation of this hardware in a residential area is likely to cause harmful interference. Users are required to correct the interference at their own expense or cease operation of the hardware. Changes or modifications not expressly approved by National Instruments could void the user’s right to operate the hardware under the local regulatory rules.

  • Page 6: Table Of Contents

    Contents About This Manual Related Documentation ....................ix Chapter 1 Introduction Description of the GPIB-120B ..................1-1 What You Need to Get Started ..................1-3 Optional Equipment....................1-3 Unpacking Your GPIB-120B ................... 1-4 Chapter 2 Hardware Overview GPIB-120B LEDs......................2-1 Power On (PWR)......................
  • Page 7 Contents Appendix D NI Services Index viii | ni.com...

  • Page 8: About This Manual

    About This Manual This manual describes how to install, configure, and operate the National Instruments GPIB-120B. Related Documentation The following documents contain information that you may find helpful as you read this manual: • ANSI/IEEE Standard 488.1-1987, IEEE Standard Digital Interface for Programmable Instrumentation •...

  • Page 9: Description Of The Gpib-120B

    Introduction This chapter contains a description of the GPIB-120B, lists what you need to get started and optional equipment you can order, and explains how to unpack the GPIB-120B. Description of the GPIB-120B The GPIB-120B is a high-speed bus isolator/expander with the following features: •...
  • Page 10 A cable length limit of 20 m total per contiguous bus or 2 m multiplied by the number of devices on the bus, whichever is smaller. With each GPIB-120B, you can add up to 14 additional devices to the bus. The GPIB-120B appears as a device load on each side of the expansion; therefore, one GPIB-120B increases the maximum load limit from 15 devices to 28 devices.

  • Page 11: What You Need To Get Started

    What You Need to Get Started GPIB-120B 10–18 VDC 9 W power supply Standard GPIB cables to connect both sides of the GPIB-120B to buses on either side Optional Equipment Contact National Instruments to order any of the following optional equipment.

  • Page 12: Unpacking Your Gpib-120B

    GPIB-120B ships with a power adapter capable of working with an input AC voltage between 100 V and 240 V. This adapter provides 12 VDC to the GPIB-120B. This adapter can be replaced as long as the replacement provides the GPIB-120B with a DC voltage between 10 VDC and 18 VDC and has appropriate safety certification marks for country of use.

  • Page 13: Hardware Overview

    This chapter describes your GPIB isolator/expander. GPIB-120B LEDs The GPIB-120B has seven light-emitting diodes (LEDs). The POWER LED on the left side of the isolator/expander is lit whenever you power on the GPIB-120B. For each bus, an LED indicates the status of the System Controller, Active Controller, or Source Handshake state, as shown in Figure 2-1.

  • Page 14: Source Handshake Detection (Sh)

    The GPIB-120B isolator/expander has two data transfer modes—unbuffered mode and buffered mode. The data transfer mode determines how data is transmitted across the expansion. The switch on the back of the GPIB-120B sets the GPIB isolator/expander operation mode. The default switch setting is for unbuffered transfer mode.

  • Page 15: Setting The Data Transfer Mode

    The switch to select buffered or unbuffered mode is recessed to avoid Note unintentional toggling during operation of the GPIB-120B. Flipping the switch may require a flathead screwdriver or similar tool. Verify that the switch on your GPIB isolator/expander is in the desired position before powering on the unit.

  • Page 16: Parallel Poll Operation

    Thus the controller would miss the responses of the devices on the secondary side. To solve this problem, the secondary side of the GPIB-120B samples the state of the bus every 600 ns during parallel polls and sends that data back to the primary side. Therefore, taking the start of the poll on the primary side as time 0, the state of the secondary bus is sent to the primary side at times 600 ns, 1200 ns, 1800 ns and so on, and again when the poll actually ends.

  • Page 17: Configuring And Using Your Hardware

    (100-240 VAC). Plug the other end of the power cord into the power supply. Connect the 12 VDC output of the power supply into the GPIB-120B rear panel. Link your GPIB instrument(s), board(s), and other device(s) to the GPIB-120B with appropriate cables.

  • Page 18: Gpib Basics

    Some devices can play more than one role. A digital voltmeter, for example, can be a Talker and a Listener. If your system has a National Instruments GPIB interface and software installed, it can function as a Talker, Listener, and Controller.
  • Page 19 Appendix A GPIB Basics The GPIB is like a typical computer bus, except that the typical computer has circuit cards interconnected via a backplane bus, whereas the GPIB has standalone devices interconnected via a cable bus. The role of the GPIB Controller is similar to the role of the CPU of a computer, but a better analogy is to the switching center of a city telephone system.
  • Page 20 Figure A-1. With this design, you can link devices in a linear configuration, a star configuration, or a combination of the two configurations. Figure A-2 shows the linear and star configurations. © National Instruments | A-3...
  • Page 21 Appendix A GPIB Basics Figure A-1. GPIB Connector and the Signal Assignment DIO1 DIO5 DIO2 DIO6 DIO3 DIO7 DIO4 DIO8 GND (TW PAIR W/DAV) NRFD GND (TW PAIR W/NRFD) NDAC GND (TW PAIR W/NDAC) GND (TW PAIR W/IFC) GND (TW PAIR W/SRQ) GND (TW PAIR W/ATN) SHIELD SIGNAL GROUND...
  • Page 22 There must be at least one equivalent device load per meter of cable. To exceed these limitations, you can use a bus expander to increase the number of device loads. You can order GPIB-120B bus expanders from National Instruments. © National Instruments | A-5...
  • Page 23 Message ASCII Message — MLA0 MLA1 — " MLA2 — MLA3 MLA4 MLA5 — & MLA6 — MLA7 MLA8 MLA9 — MLA10 — MLA11 — MLA12 — MLA13 — MLA14 — MLA15 — MLA16 MLA17 © National Instruments | B-1...
  • Page 24 Appendix B Multiline Interface Messages Table B-1. Multiline Interface Messages ASCII Message ASCII Message — MLA18 — MLA19 MLA20 MLA21 — MLA22 — MLA23 MLA24 MLA25 — MLA26 — MLA27 — < MLA28 — MLA29 — > MLA30 MTA0 MSA0, PPE MTA1 MSA1, PPE, CFG1 MTA2...
  • Page 25 My Listen Address S P E Serial Poll Enable My Secondary Address T C T Take Control My Talk Address U N L Unlisten Parallel Poll Configure U N T Untalk P P D Parallel Poll Disable © National Instruments | B-3...
  • Page 26 Specifications This appendix lists the GPIB-120B isolator/expander specifications and characteristics. System Configuration Loading per expansion Up to 14 additional devices (28 total devices in the expansion system, not including the GPIB-120B on the bus.) Multiple expansions Permitted in any combination of star or linear...
  • Page 27 300 mA typical 500 mA maximum Fuse rating and type F 2.2 A 125 V, surface mount 12 VDC Power Supply (Shipped with GPIB-120B) Input voltage range 100-240 VAC 47-63 Hz Environment Maximum altitude 2,000 m (at 25 °C ambient temperature) Pollution Degree Indoor use only.
  • Page 28 GPIB-120B User Manual For the GPIB-120B to operate correctly over the entire specified ambient Note temperature range, stacking the product is not recommended. Relative humidity range 10% to 90%, noncondensing (Tested in accordance with IEC 60068-2-56.) Storage Environment Ambient temperature range -20 to 70 °C...
  • Page 29 0.800 in. (20.32 mm) 1.441 in. (36.61 mm) 0.152 in. (3.86 mm) 1.875 in. 2.250 in. 0.152 in. (3.86 mm) (47.63 mm) (57.15 mm) 6.000 in. (152.4 mm) The GPIB-120B has threaded inserts for mounting options. Note C-4 | ni.com...
  • Page 30 Certification column. Environmental Management NI is committed to designing and manufacturing products in an environmentally responsible manner. NI recognizes that eliminating certain hazardous substances from our products is beneficial to the environment and to NI customers. © National Instruments | C-5...
  • Page 31 At the end of the product life cycle, all NI products must be EU Customers disposed of according to local laws and regulations. For more information about how to recycle NI products in your region, visit ni.com/environment/weee. National Instruments (RoHS) National Instruments RoHS ni.com/environment/rohs_china...
  • Page 32 • System Integration—If you have time constraints, limited in-house technical resources, or other project challenges, National Instruments Alliance Partner members can help. To learn more, call your local NI office or visit ni.com/alliance © National Instruments | D-1...
  • Page 33 Appendix D NI Services • Training and Certification—The NI training and certification program is the most effective way to increase application development proficiency and productivity. Visit for more information. ni.com/training – The Skills Guide assists you in identifying the proficiency requirements of your current application and gives you options for obtaining those skills consistent with your time and budget constraints and personal learning preferences.
  • Page 34 2-2 description of, 1-1 setting, 2-3 switch setting, buffered (figure), 2-3 unbuffered, 2-2 handshake lines (table), A-3 description of GPIB-120B, 1-1 hardware DIN rail mount kit (figure), 1-4 configuring, 3-1 documentation parallel poll response modes, 2-4 related documentation, ix...
  • Page 35 Index interface management lines (table), A-3 safety specifications, C-5 interface messages, multiline, B-1 source handshake detection, 2-2 table, B-1 specifications CE compliance, C-5 electrical characteristics, C-2 electromagnetic compatibility, C-5 LEDs environmental management, C-5 active controller detection, 2-2 operational characteristics, C-2 data direction control, 2-3 performance characteristics, C-1 meanings of colors, 2-1...

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