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GPIB-BUF
User Manual
February 1994 Edition
Part Number 320125-01
© Copyright 1989, 1994 National Instruments Corporation.
All Rights Reserved.
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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, Germany 089/741 31 30, Italy 02/48301892, Japan (03) 3788-1921, Netherlands 03480-33466, Norway 32-848400, Spain (91) 640
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MicroGPIB Products National Instruments has developed the MicroGPIB product line to offer a series of high performance, low cost IEEE 488 support items that are packaged in small all-metal cases, capable of being rack mounted. Limited Warranty The GPIB-BUF 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
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action accrues. 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; owner’s modification of the product; owner’s abuse, misuse, or negligent acts; and power failure or surges, fire, flood, accident, actions of third parties,
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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 Commission (FCC) Rules for a Class A digital device.
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There is no guarantee that interference will not occur in a particular installation. However, the chances of interference are much less if the equipment is installed and used according to this instruction manual. If the equipment does cause interference to radio or television reception, which can be determined by turning the equipment on and off, one or more of the following suggestions may reduce or eliminate the problem. • Operate the equipment and the receiver on different branches of your A
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Contents About This Manual ..........................................................................ix Introduction to the GPIB-BUF ................................................... ix Organization of This Manual......................................................ix Conventions Used in This Manual ............................................. x Related Documentation
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Contents Appendix A Hardware Specifications ..............................................................A-1 Appendix B Customer Communication ..........................................................B-1 Glossary............................................................................................... G-1 Figures Figure 1-1. The GPIB-BUF ................................................................... 1-1 Figure 1-2. The GPIB-BUF Front Panel ............................................
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About This Manual Introduction to the GPIB-BUF The GPIB-BUF is one of National Instruments family of MicroGPIB products. These products are high-performance, low-cost IEEE 488 support items, packaged in small all-metal cases, capable of being rack mounted. Organization of This Manual This manual is organized as follows: • Chapter 1, Description of the GPIB-BUF, contains ge
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About This Manual Conventions Used in This Manual The following conventions are used in this manual. italic Italic text denotes emphasis, a cross reference, or an introduction to a key concept. bold italic Bold italic text denotes a note, caution, or warning. bold Bold text denotes the name of light-emitting diode (LED). Abbreviations, acronyms, metric prefixes, mnemonics, symbols, and terms are listed in the Glossary. Related Documentation The following document contains information that you ma
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Chapter 1 Description of the GPIB-BUF This chapter contains general information about the National Instruments 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 performanc
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Description of the GPIB-BUF Chapter 1 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. Because the GPIB-BUF can talk or listen on either port at any time, the GPIB-BUF provides fully transparent bi-directional data transfers. The target GPIB device appears to be connected directly to the IEEE 488 bus. What Y
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Chapter 1 Description of the GPIB-BUF The GPIB-BUF Front Panel The power switch and six Light Emitting Diodes (LEDs) are mounted on the GPIB-BUF front panel. Figure 1-2 shows the front panel of the GPIB-BUF. NATIONAL GPIB-BUF ® INSTRUMENTS IEEE-488 IEEE-488 BUFFER 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. Table 1-1. LED Descriptions LED Indication POWER Indic
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Description of the GPIB-BUF Chapter 1 The GPIB-BUF Rear Panel Figure 1-3 shows the power cable and the GPIB cables connected to the rear panel of the GPIB-BUF. 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. The GPIB OUT connect
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Chapter 1 Description of the GPIB-BUF The port labeled GPIB IN is intended to be connected to a GPIB system that includes one or more GPIB devices which send data to the GPIB target device. All data received via the GPIB IN port is transferred into the Random Access Memory (RAM) buffer of the GPIB-BUF using the on- board Direct Memory Access (DMA) controller. The port labeled GPIB OUT should be connected to the GPIB target device. This port has GPIB controller capabilities and addresses the G
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Chapter 2 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 d
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Installation and Operation Chapter 2 Installation Install the GPIB-BUF according to the following procedure. 1. Inspect the GPIB-BUF. 2. Verify the voltage requirement. 3. Configure the operating parameters. 4. Connect the cables. 5. Power on the unit. These steps are described in more detail in the following subsections. Step 1. Inspect the GPIB-BUF Before you install the GPIB-BUF, inspect the shipping container and its contents for damage. If damage appears to have been caused in shipment, f
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Chapter 2 Installation and Operation 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. If the addresses do not match, you must either change the primary address of your target device or change the primary addres
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Installation and Operation Chapter 2 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. Key = depressed side of switch handle 1 2 34 5 678 O N O F F Figure 2-2. Factory Default Switch Settings Table 2-1 and Table 2-2 detail the possible configurations of the eight switches and what each
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Chapter 2 Installation and Operation Table 2-2. Configuration Parameters for Switches 4 through 8 Switches Indication 4567 8 OFF OFF OFF OFF OFF Sets GPIB primary address 0 OFF OFF OFF OFF ON Sets GPIB primary address 1 OFF OFF OFF ON OFF Sets GPIB primary address 2 OFF OFF OFF ON ON Sets GPIB primary address 3 OFF OFF ON OFF OFF Sets GPIB primary address 4 OFF OFF ON OFF ON Sets GPIB primary address 5 OFF OFF ON ON OFF Sets GPIB primary address 6 OFF OFF ON ON ON Sets GPIB primary address 7 OF
