Related Manuals for National Instruments GPIB-BUF
Summary of Contents for National Instruments GPIB-BUF
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Page 1: User Manual
GPIB-BUF User Manual February 1994 Edition Part Number 320125-01 © Copyright 1989, 1994 National Instruments Corporation. All Rights Reserved. - 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 2321, France (1) 48 14 24 24,...
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Page 3: Limited Warranty
The reader should consult National Instruments if errors are suspected. In no event shall National Instruments be liable for any damages arising out of or related to this document or the information contained in it. - Page 4 National Instruments shall not be liable for any delay in performance due to causes beyond its reasonable control. The warranty provided herein does not cover damages, defects, malfunctions, or service failures caused by owner’s failure to follow the National Instruments installation, operation, or maintenance instructions;...
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Page 5: Federal Communications Commission
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: Federal Communications Commission This device complies with Part 15 of the Federal Communications... - Page 6 National Instruments could void the user’s authority to operate the equipment under the FCC Rules. If necessary, consult National Instruments or an experienced radio/television technician for additional suggestions. The following booklet prepared by the FCC may also be helpful: How to Identify and Resolve Radio-TV Interference Problems.
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Page 7: Table Of Contents
The GPIB Connectors... 1-4 Chapter 2 Installation and Operation ... Installation ...2-2 Step 1. Inspect the GPIB-BUF ... 2-2 Step 2. Verify the Voltage Requirement... 2-2 Step 3. Configure the Operating Parameters ... 2-3 Step 4. Connect the Cables ... 2-6 Step 5. - Page 8 ... G-1 Figure 1-1. The GPIB-BUF ... 1-1 Figure 1-2. The GPIB-BUF Front Panel ...1-3 Figure 1-3. The GPIB-BUF Rear Panel ... 1-4 Figure 1-4. The GPIB Connector and Signal Designations ... 1-5 Figure 2-1. GPIB-BUF System Setup Example... 2-1 Figure 2-2.
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Page 9: About This Manual
GPIB-BUF. • Chapter 3, Technical Information , contains a more detailed description of the operation of the GPIB-BUF. The timing characteristics of the parallel port are provided in this chapter. • Appendix A, Hardware Specifications , contains tables which specify the electrical, environmental, and physical characteristics of the GPIB -BUF. -
Page 10: Conventions Used In This Manual
Protocols, and Common Commands. Customer Communication National Instruments wants to receive your comments on our products and manuals. We are interested in the applications you develop with our products, and we want to help if you have problems with them. To make it easy for you to contact us, this manual contains comment and configuration forms for you to complete. -
Page 11: Description Of The Gpib-Buf
GPIB-BUF and lists components and accessories. Introduction The GPIB-BUF, shown in Figure 1-1, is an IEEE 488 (GPIB) data buffer which increases GPIB performance by isolating a slow GPIB data acceptor from the rest of the GPIB system. This increase in performance is reflected both in an increase in the GPIB bandwidth and a quicker release of the GPIB talker from the task of transferring data to a slow GPIB device. -
Page 12: What Your Kit Contains
Description of the GPIB-BUF The GPIB-BUF has two isolated GPIB ports and is placed in-line between a GPIB system and a single, slower GPIB device (usually a printer or plotter). The GPIB-BUF automatically buffers all device-dependent data sent to the slower device. -
Page 13: The Gpib-Buf Front Panel
INSTRUMENTS POWER READY TALK LISTEN EMPTY FULL Figure 1-2. The GPIB-BUF Front Panel The LEDs show the current status of the GPIB-BUF at all times. The following table describes each LED. POWER Indicates that power to the unit has been applied and the ON/OFF switch is in the ON position. -
Page 14: The Gpib-Buf Rear Panel
Figure 1-3. The GPIB-BUF Rear Panel The GPIB Connectors The GPIB-BUF has two GPIB connectors labeled GPIB IN and GPIB OUT. Both GPIB connectors are standard 24-pin shielded AMP CHAMP female connectors with metric screwlock hardware. As you face the rear panel, the GPIB IN connector is the right-most GPIB connector. -
Page 15: Figure 1-4. The Gpib Connector And Signal Designations
OUT should be connected to the GPIB target device. This port has GPIB controller capabilities and addresses the GPIB target device when required. All data input to the internal GPIB-BUF RAM buffer is output via the GPIB OUT port. Under normal operating conditions, you should only connect one device (your GPIB target device) to the GPIB OUT port. -
Page 16: Installation And Operation
This chapter describes the procedures for installing and operating the GPIB -BUF. Figure 2-1 shows an example of a GPIB-BUF connected to a GPIB system. This example shows a GPIB-BUF placed in a GPIB system with a GPIB Talker/Controller, such as an IBM-PC with a National Instruments GPIB -PCII Controller board installed, and a slow GPIB data acceptor, such as an HP 7475A Color Plotter. -
Page 17: Installation
Contact National Instruments for instructions. Step 2. Verify the Voltage Requirement The GPIB-BUF is shipped from the factory with either a 115 V or 230 V wall-mount power supply. Verify that the voltage on the power supply matches the voltage that is supplied in your area. -
Page 18: Step 3. Configure The Operating Parameters
Chapter 2 Step 3. Configure the Operating Parameters The GPIB-BUF is shipped from the factory configured to operate at a GPIB primary address of 5 with the SRQ-on-empty function disabled and device clear recognition and pass through enabled. The address specified on the configuration switches should match the GPIB address of your target device. -
Page 19: Set Configuration Switches
Set Configuration Switches Use the DIP switch at location U38 on the printed circuit board to configure the GPIB primary address and operating modes of the GPIB-BUF. The DIP switch has eight configuration switches. Figure 2-2 shows the factory default setting. -
Page 20: Table 2-2. Configuration Parameters For Switches 4 Through 8
Chapter 2 Table 2-2. Configuration Parameters for Switches 4 through 8 Switches © National Instruments Corp. Installation and Operation Sets GPIB primary address 0 Sets GPIB primary address 1 Sets GPIB primary address 2 Sets GPIB primary address 3 Sets GPIB primary address 4... -
Page 21: Step 4. Connect The Cables
Connect the cables as follows: Connect the power jack of the wall-mount power supply to the power receptacle on the back panel of the GPIB-BUF, then plug the supply into an AC outlet of the correct voltage. Connect a GPIB cable from the target device to the GPIB OUT port on the rear panel of the GPIB-BUF. -
Page 22: Step 5. Power On The Unit
GPIB link to the target device; therefore, ensure that the GPIB target device is powered on before the GPIB-BUF. When the GPIB-BUF is addressed to listen, all data sent to the unit via the GPIB IN port is input directly to memory by the on-board DMA controller at speeds up to 900 kbytes/s and is stored in the internal data buffer. -
Page 23: Technical Information
After the GPIB-BUF has successfully completed its power-on self-test, it asserts the Interface Clear (IFC *) signal on the GPIB OUT port to initialize the link between the GPIB-BUF and the target device, and to establish the ability of the GPIB-BUF to address the target device. The GPIB-BUF then reads the status of the configuration switches and initializes the rest of the system. -
Page 24: Addressing
GPIB address as the GPIB-BUF. If all the GPIB address switches are set to ON, the GPIB-BUF is configured to operate in listen-only mode. In this mode, no addressing is required to make the GPIB-BUF a GPIB Listener and it cannot be unaddressed to listen. -
Page 25: Eoi
GPIB IN port. Both events take place concurrently and without user intervention. If very large amounts of data are sent to the GPIB-BUF (greater than the amount of RAM in the system) and the target device is a very slow data acceptor (such as a printer or plotter), the internal data buffer of the GPIB -BUF can become full. -
Page 26: Ren
If the GPIB-BUF detects IFC* asserted on the GPIB IN port, it immediately unaddresses itself (unless it is in listen-only mode) and stops accepting data. IFC* does not clear the GPIB-BUF data buffer or assert IFC* on the GPIB OUT port since either of these operations aborts any current data transfer taking place to the target device. -
Page 27: Polling The Gpib-Buf
The empty bit always reflects the current status of the buffer while the SRQ bit only returns a 1 if the GPIB-BUF is asserting the SRQ* signal line. The GPIB-BUF asserts the SRQ* signal if the buffer is currently empty and the SRQ-on-empty function is enabled by Switch 3 of U38. - Page 28 The following paragraphs explain how this last point can be beneficial: Suppose that you need to send a file to a plotter via the GPIB-BUF and the file is larger than the available memory in the GPIB-BUF. Since the plotter is a slow data acceptor and you are sending a large file, the GPIB -BUF buffer will most likely become full.
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Page 29: Table 3-1. Parallel Poll Responses
Chapter 3 Internally, the local Individual Status (ist) bit of the GPIB-BUF is reset to 0 when the internal data buffer is empty of data. It is set to 1 when the internal data buffer is not empty. Therefore, after the GPIB Controller configures the GPIB-BUF with a... -
Page 30: Special Note About Timeouts
If switch 2 is on, the GPIB-BUF immediately passes a DCL to the GPIB target device when a DCL or SDC is received. If switch 2 is off (default), the GPIB-BUF not only passes a DCL to the target device but also clears its GPIB-BUF User Manual... - Page 31 Neither Group Execute Trigger (GET), Go To Local (GTL), nor Local Lockout (LLO) have any effect on the GPIB-BUF. The GPIB IN port on the GPIB-BUF can only act as a GPIB Talker or Listener. It should not be passed control. If it is, the GPIB circuitry in the GPIB-BUF will accept control and immediately assert ATN*.
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Page 32: Appendix A Hardware Specifications
Chapter 1 Appendix A Hardware Specifications This appendix lists the electrical, environmental, and physical specifications of th Characteristic Power Supply Unit Voltage Current Characteristic Operating Temperature Storage Temperature Relative Humidity Noise Emissions Description of the GPIB-232CV Table A-1. Electrical Characteristics Specification Wall mount type, 115 VAC or 230 VAC, 50/60 Hz input, 9 VDC @ 1A max output... -
Page 33: Table A-3. Physical Characteristics
Hardware Specifications Characteristic Case Size Case Material Rack Mounting Weight Table A-3. Physical Characteristics Specification 1.6 in. by 5.7 in. by 8.4 in. (40.6 mm by 144.8 mm by 213.4 mm) All metal enclosure Single or dual kits available 28 oz. (796 gm) without power supply unit Appendix A... -
Page 34: Appendix B Customer Communication
Filling out a copy of the Technical Support Form before contacting National Instruments helps us help you better and faster. - Page 35 Name Company Address Fax ( Computer brand Model Operating system Speed Display adapter Mouse Other adapters installed Hard disk capacity Instruments used National Instruments hardware product model Revision Configuration National Instruments software product Version Configuration Phone ( Processor Brand (continues)
- Page 36 The problem is List any error messages The following steps will reproduce the problem...
- Page 37 Record the settings and revisions of your hardware on the line to the right of each item. Update this form each time you revise your hardware configuration, and use this form as a reference for your current configuration. National Instruments Products • GPIB-BUF Revision •...
- Page 38 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-BUF User Manual Edition Date: February 1994 Part Number: 320125-01 Please comment on the completeness, clarity, and organization of the manual.
- Page 39 Thank you for your help. Name Title Company Address Phone Mail to: Technical Publications National Instruments Corporation 6504 Bridge Point Parkway, MS 53-02 Austin, TX 78730-5039 Fax to: Techn ical Publications National Instruments Corporation MS 53-02 (512) 794-5678...
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Page 40: Glossary
Glossary Prefix ANSI GPIB IEEE Meaning micro milli- kilo- mega- degrees percent amperes alternating current American National Standards Institute Celsius electromagnetic interference Federal Communications Commission General Purpose Interface Bus hertz Institute of Electrical and Electronic Engineers inches kilobytes of memory light-emitting diode meters megabytes of memory...