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

National Instruments GPIB-120B Manual

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  • Page 1 National Instruments GPIB-120B Manual Get Pricing & Availability at ApexWaves.com Call Today: 1-800-915-6216 Email: sales@apexwaves.com https://www.apexwaves.com/modular-systems/national-instruments/gpib-instrument-control-modules/GPIB-120B...
  • Page 2 GPIB GPIB-120B User Manual GPIB-120B User Manual April 2010 371851B-01...
  • Page 3 Thailand 662 278 6777, Turkey 90 212 279 3031, United Kingdom 44 (0) 1635 523545 For further support information, refer to the Technical Support and Professional Services appendix. To comment on National Instruments documentation, refer to the National Instruments Web site at and enter ni.com/info the Info Code feedback ©...
  • Page 4 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 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 Conventions ........................vii Related Documentation....................viii Chapter 1 Introduction Description of the GPIB-120B ..................1-1 What You Need to Get Started ..................1-3 Optional Equipment..................1-4 Unpacking Your GPIB-120B ................1-5 Chapter 2 Hardware Overview GPIB-120B LEDs ......................2-1 Power On (PWR).....................2-1 System Controller Detection (SC)..............2-2 Active Controller Detection (AC) ..............2-2...
  • Page 7 Contents Appendix C Specifications Appendix D Technical Support and Professional Services Glossary Index GPIB-120B User Manual ni.com...

  • Page 8: About This Manual

    Bold text also denotes parameter names. GPIB-120B GPIB-120B refers to a National Instruments GPIB isolator/expander that expands and isolates the GPIB up to a maximum of 2500 VDC. IEEE 488 and IEEE 488 and IEEE 488.2 refer to the ANSI/IEEE Standard 488.1-1987 IEEE 488.2...

  • Page 9: 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 • ANSI/IEEE Standard 488.2-1992, IEEE Standard Codes, Formats, Protocols, and Common Commands GPIB-120B User Manual viii ni.com...

  • Page 10: Introduction

    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 11 Computer Printer Multimeter Signal Generator (Controller, Talker, (Listener) (Talker and Listener) (Listener) and Listener) Unit Under Test Figure 1-1. Typical GPIB-120B Expansion System (Physical Configuration) GPIB Computer Printer Multimeter Signal Generator (Controller, Talker, (Listener) (Talker and Listener) (Listener) and Listener) Unit Under Test Figure 1-2.

  • Page 12: What You Need To Get Started

    A cable length limit of 20 m total per contiguous bus or 2 m times 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;...

  • Page 13: Optional Equipment

    Chapter 1 Introduction Optional Equipment You can contact National Instruments to order any of the following optional equipment. • Rack-mount kit (part number 194906-01, shown in Figure 1-3) Figure 1-3. Rack Mount Kit • DIN rail mount kit (part number 779689-01, shown in Figure 1-4) Figure 1-4.

  • Page 14: Unpacking Your Gpib-120B

    The 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.

  • Page 15: Hardware Overview

    Figure 2-1. Front View GPIB-120B Power On (PWR) When you power on the GPIB-120B, all circuitry is cleared to an initialized state. The isolation/expansion system is fully operational when you power on the GPIB-120B and your instruments are connected. Where there is GPIB activity, it is recommended that you keep at least two-thirds of the devices on both buses powered on.

  • Page 16: System Controller Detection (Sc)

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

  • Page 17: Selecting A Data Transfer Mode

    3-wire interlocked behavior of GPIB is maintained. Buffered mode applies only to data transfers. GPIB command bytes are not stored in the FIFO buffers; they are transmitted using the GPIB double-interlocked handshaking protocol. © National Instruments Corporation GPIB-120B User Manual...

  • Page 18: Setting The Data Transfer Mode

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

  • Page 19: Parallel Poll Operation

    400 ns later. Therefore, if the secondary side of the GPIB-120B waited until the end of its parallel poll to send the result of the poll to the primary side, it would be after the primary side poll has ended.

  • Page 20: Configuring And Using Your Hardware

    Configuring and Using Your Hardware This chapter describes how to configure and use your GPIB-120B. Connecting the GPIB-120B To connect the GPIB-120B, follow the steps below. Make sure that the power switch on the isolator/expander is in the off (0) position.

  • Page 21: Gpib Basics

    The term command as used here does not refer to device instructions, which are also called commands. Those device-specific instructions are data messages. © National Instruments Corporation GPIB-120B User Manual...
  • Page 22 Some devices are capable of playing 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 23 Also used by the Talker to signal high-speed GPIB transfers. NDAC Listening device has/has not accepted a message (not data accepted) byte. Talking device indicates signals on data lines are (data valid) stable (valid) data. © National Instruments Corporation GPIB-120B User Manual...
  • Page 24 Any device can drive the SRQ line to (service request) asynchronously request service from the Controller. Talker uses the EOI line to mark the end of a data (end or identify) message. Controller uses the EOI line when it conducts a parallel poll. GPIB-120B User Manual ni.com...
  • Page 25 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 Figure A-1. GPIB Connector and the Signal Assignment © National Instruments Corporation GPIB-120B User Manual...
  • Page 26 A maximum separation of 4 m between any two devices and an average separation of 2 m over the entire bus. • A maximum total cable length of 20 m. • A maximum of 15 devices connected to each bus, with at least two-thirds powered on. GPIB-120B User Manual ni.com...
  • Page 27 There must be at least one equivalent device load per meter of cable. If you want 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.
  • Page 28 The interface functions include initializing the bus, addressing and unaddressing devices, and setting device modes for local or remote programming. For more information about these messages, refer to the ANSI/IEEE Standard 488.1-1987, IEEE Standard Digital Interface for Programmable Instrumentation. © National Instruments Corporation GPIB-120B User Manual...
  • Page 29 MLA11 — MLA12 — MLA13 — MLA14 — MLA15 — MLA16 MLA17 — MLA18 — MLA19 MLA20 MLA21 — MLA22 — MLA23 MLA24 MLA25 — MLA26 — MLA27 — < MLA28 — MLA29 — > MLA30 GPIB-120B User Manual ni.com...
  • Page 30 MSA20, PPD MTA21 MSA21, PPD MTA22 MSA22, PPD MTA23 MSA23, PPD MTA24 MSA24, PPD MTA25 MSA25, PPD MTA26 MSA26, PPD MTA27 MSA27, PPD MTA28 MSA28, PPD MTA29 MSA29, PPD MTA30 MSA30, PPD — © National Instruments Corporation GPIB-120B User Manual...
  • Page 31 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 GPIB-120B User Manual ni.com...
  • Page 32 Specifications This appendix lists the specifications and characteristics of the GPIB-120B isolator/expander. 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...
  • Page 33 Current consumption @12 V....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 ........2...
  • Page 34 (Tested in accordance with IEC-60068-2-1 and IEC-60068-2-2.) Note For the GPIB-120B to operate correctly over the entire specified ambient 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....
  • Page 35 Specifications Physical Characteristics Overall dimensions .........6.30 × 3.68 × 1.24 in. (16.01 × 9.35 × 3.15 cm) Case material ..........PC-ABS plastic Weight ............8.64 oz (245 g) GPIB cable..........Type X2 shielded Figure C-1 shows the GPIB-120B dimensions. GPIB-120B User Manual ni.com...
  • Page 36 0.152 in. (3.86 mm) 1.875 in. 0.152 in. 2.250 in. (3.86 mm) (47.63 mm) (57.15 mm) 6.000 in. (152.4 mm) Figure C-1. GPIB-120B Dimensions Note The GPIB-120B has threaded inserts for mounting options. © National Instruments Corporation GPIB-120B User Manual...
  • Page 37 Refer to the product Declaration of Conformity (DoC) for additional regulatory compliance information. To obtain product certifications and the DoC for this product, visit , search by model ni.com/certification number or product line, and click the appropriate link in the Certification column. GPIB-120B User Manual ni.com...
  • Page 38 Appendix C Specifications Environmental Management National Instruments is committed to designing and manufacturing products in an environmentally responsible manner. NI recognizes that eliminating certain hazardous substances from our products is beneficial not only to the environment but also to NI customers.
  • Page 39 Technical Support and Professional Services Visit the following sections of the award-winning National Instruments Web site at for technical support and professional services: ni.com • Support—Technical support at includes the ni.com/support following resources: – Self-Help Technical Resources—For answers and solutions,...
  • Page 40 You also can visit the Worldwide Offices section of to access the branch ni.com/niglobal office Web sites, which provide up-to-date contact information, support phone numbers, email addresses, and current events. GPIB-120B User Manual ni.com...
  • Page 41 HS488 Acceptor Handshake Extended interface function ANSI American National Standards Institute ASCII American Standards Code for Information Interchange ASIC application-specific integrated circuit Attention Celsius Controller-In-Charge central processing unit Canadian Standards Association data valid decibels direct current © National Instruments Corporation GPIB-120B User Manual...
  • Page 42 General Purpose Interface Bus hexadecimal hertz Identify International Electrotechnical Commission IEEE Institute of Electrical and Electronic Engineers Interface Clear inches pounds light-emitting diode meters seconds HS488 Source Handshake Extended interface function transistor-transistor logic Underwriter’s Laboratories volts volts alternating current GPIB-120B User Manual ni.com...
  • Page 43 (table), A-4 unbuffered, 2-3 linear and star system configuration Declaration of Conformity (NI resources), D-2 (figure), A-6 description of GPIB-120B, 1-1 physical and electrical diagnostic tools (NI resources), D-1 characteristics, A-5 DIN rail mount kit (figure), 1-4 talkers, listeners, and controllers, A-2 types of messages, A-1 ©...
  • Page 44 1-1 multiline interface messages, B-1 table, B-2 handshake lines (table), A-3 hardware configuring, 3-1 parallel poll response modes, 2-5 National Instruments support and data transfer modes, 2-2 services, D-1 buffered, 2-3 setting, 2-4 switch setting, buffered (figure), 2-4 unbuffered, 2-3...
  • Page 45 Waste Electrical and Electronic Equipment (WEEE), C-7 support, technical, D-1 switch setting, buffered (figure), 2-4 Waste Electrical and Electronic Equipment system configuration, C-1 (WEEE) specifications, C-7 system controller detection, 2-2 Web resources, D-1 © National Instruments Corporation GPIB-120B User Manual...

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