National Instruments GPIB-422CV User Manual
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National Instruments GPIB-422CV User Manual

National Instruments GPIB-422CV User Manual

Ieee 488 rs-232 converter
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  • Page 1 GPIB-422CV...
  • Page 2 GPIB-232CV User Manual IEEE 488 RS-232 Converter April 1994 Edition Part Number 320109-01 © Copyright 1987, 1994 National Instruments Corporation. All Rights Reserved.
  • Page 3 National Instruments Corporate Headquarters 6504 Bridge Point Parkway Austin, TX 78730-5039 (512) 794-0100 Technical support fax: (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,...
  • Page 4 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 5 Under the copyright laws, this publication may not be reproduced or transmitted in any form, electronic or mechanical, including photocopying, recording, storing in an information retrieval system, or translating, in whole or in part, without the prior written consent of National Instruments Corporation. Trademarks Product and company names listed are trademarks or trade names of their respective companies.
  • Page 6 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 7 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.

  • Page 8: Table Of Contents

    Choosing a Serial Port Buffer Size ......3-2 Using the SRQ Feature ..........3-3 Enabling the SRQ Feature......3-3 Conditions that Assert SRQ ......3-4 Serial Poll Responses ..........3-4 Listen-Only Mode............3-4 © National Instruments Corp. GPIB-232CV User Manual...
  • Page 9 Using the GPIB-232CV as a High-Speed Print Spooler ..C-1 Using the GPIB-232CV to Connect a HP7475 GPIB Plotter to a PC Serial Port ............C-4 Appendix D Customer Communication ............D-1 Glossary ....................G-1 GPIB-232CV User Manual viii © National Instruments Corp.
  • Page 10 Configuration Parameters for U20 Switches 6 through 8 ................ 2-9 Table A-1. Electrical Characteristics ..........A-1 Table A-2. Environmental Characteristics .......... A-1 Table A-3. Physical Characteristics ............ A-2 Table B-1. RS-232 Serial Port Signals..........B-2 © National Instruments Corp. GPIB-232CV User Manual...

  • Page 11: About This Manual

    About This Manual The GPIB-232CV User Manual describes the features, functions, and operation of the Product. The GPIB-232CV 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.

  • Page 12: Conventions Used In This Manual

    488.1-1987 and the ANSI/IEEE Standard 488.2-1987, respectively, which define the GPIB. RS-232 RS-232 is used throughout this manual to refer to the ANSI/EIA-232-C standard. Abbreviations, acronyms, metric prefixes, mnemonics, and terms are listed in the Glossary. GPIB-232CV User Manual © National Instruments Corp.

  • Page 13: Related Documentation

    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 14: Description Of The Gpib-232Cv

    256 KB character buffer. This buffer is used to offload the host computer during printer and plotter applications. Figure 1-1. The GPIB-232CV © National Instruments Corp. GPIB-232CV User Manual...

  • Page 15: What Your Kit Contains

    Your kit should contain the following components: Component Part Number One of the following boxes: • GPIB-232CV (256 KB RAM - 115 VAC) 776174-02 • GPIB-232CV (256 KB RAM - 230 VAC) 776174-32 GPIB-232CV User Manual 320109-01 GPIB-232CV User Manual © National Instruments Corp.

  • Page 16: Optional Equipment

    The front panel of the GPIB-232CV is shown in Figure 1-2. The power switch and six light-emitting diodes (LEDs) are mounted on the GPIB-232CV front panel. GPIB-232CV IEEE 488 RS-232 CONVERTER POWER READY TALK LISTEN BUSY FULL Figure 1-2. The GPIB-232CV Front Panel © National Instruments Corp. GPIB-232CV User Manual...

  • Page 17: Table 1-1. Led Descriptions

    Indicates that one of the GPIB-232CV data buffers is full. This is not an error condition, but is merely a signal that bus performance may be reduced to the speed of the slower interface. GPIB-232CV User Manual © National Instruments Corp.

  • Page 18: The Gpib-232Cv Rear Panel

    The GPIB-232CV Rear Panel The power cord, serial cable, and GPIB cable connections are on the rear panel. Figure 1-3 shows the rear panel of the GPIB-232CV. Figure 1-3. The GPIB-232CV Rear Panel © National Instruments Corp. GPIB-232CV User Manual...

  • Page 19: The Rs-232 Connector

    Figure 1-4. For more information on the RS-232 signals refer to Appendix B, Interfacing to a Serial Device. Figure 1-4. The RS-232 Connector and Signal Designations GPIB-232CV User Manual © National Instruments Corp.

  • Page 20: The Gpib Connector

    GND (Twisted Pair with NDAC*) NDAC* IFC* GND (Twisted Pair with IFC*) SRQ* GND (Twisted Pair with SRQ*) ATN* GND (Twisted Pair with ATN*) SHIELD SIGNAL GROUND Figure 1-5. The GPIB Connector and Signal Designations © National Instruments Corp. GPIB-232CV User Manual...

  • Page 21: Configuration And Installation

    IBM PC serial port through a GPIB-232CV. Serial GPIB Cable Cable GPIB-422CV IEEE 488 RS-422 CONVERTER POWER READY TALK LISTEN BUSY FULL Digital Multimeter GPIB-232CV IBM PC (GPIB Device) (Serial Device) Figure 2-1. Example of C Mode System Setup © National Instruments Corp. GPIB-232CV User Manual...

  • Page 22: Installation

    An example of a system operating in D mode is a RS-232 device, such as a serial printer, connected to a GPIB system with an existing GPIB Controller, such as an IBM PC with a National Instruments AT-GPIB board, as shown in Figure 2-2.

  • Page 23: Step 1. Inspection

    If the equipment appears to be damaged, do not attempt to operate it. Contact National Instruments for instructions. Step 2. Verify the Voltage Requirement The GPIB-232CV is shipped from the factory with either a 115V or 230V wall-mount supply.

  • Page 24: Set Configuration Switches

    Switches 4 through 8 are in the OFF OFF ON OFF ON positions, respectively; this indicates a GPIB primary address of 5. Tables 2-1, 2-2, and 2-3 show the possible configurations of the eight switches and what the configurations indicate. GPIB-232CV User Manual © National Instruments Corp.
  • Page 25 C Mode Small serial buffer and Time-out termination disable SRQ Small serial buffer and CR termination enable SRQ Large serial buffer and LF termination disable SRQ Large serial buffer and No swapping enable SRQ © National Instruments Corp. GPIB-232CV User Manual...

  • Page 26: Table 2-3. Configuration Parameters For U22 Switches

    GPIB Primary Address 14 GPIB Primary Address 15 GPIB Primary Address 16 GPIB Primary Address 17 GPIB Primary Address 18 GPIB Primary Address 19 GPIB Primary Address 20 GPIB Primary Address 21 GPIB Primary Address 22 GPIB-232CV User Manual © National Instruments Corp.
  • Page 27 GPIB Primary Address 25 GPIB Primary Address 26 GPIB Primary Address 27 GPIB Primary Address 28 GPIB Primary Address 29 GPIB Primary Address 30 Sets listen-only operation (D mode) or no addressing performed (C mode) © National Instruments Corp. GPIB-232CV User Manual...

  • Page 28: Figure 2-4. Factory Default Settings For Switch U20

    Switches 6 through 8 are in the ON OFF ON positions, respectively, indicating that the serial port will be operating at 9600 baud. Tables 2-4 and 2-5 show the possible configurations of the eight switches and what the configurations indicate. GPIB-232CV User Manual © National Instruments Corp.

  • Page 29: Table 2-4. Configuration Parameters For U20 Switches

    Table 2-5. Configuration Parameters for U20 Switches 6 through 8 Switches Indication 300 baud 600 baud 1200 baud 2400 baud 4800 baud 9600 baud 19200 baud 38400 baud © National Instruments Corp. GPIB-232CV User Manual...

  • Page 30: Step 4. Connect The Cables

    If the READY light still fails to come on, contact National Instruments for further instructions. Operation The GPIB-232CV is now ready to operate. All characters sent to the unit will be received at full speed and stored in the internal data buffer.
  • Page 31 When you are expecting data from the serial device, address the GPIB-232CV to talk, and all data received over the serial port will then be passed along to the GPIB. © National Instruments Corp. 2-11 GPIB-232CV User Manual...

  • Page 32: Operation

    A boldface mnemonic indicates that it is a signal name, or a front panel LED indicator. • <CR> is the symbol for the Carriage Return character (hex 0D). • <LF> is the symbol for the Linefeed character (hex 0A). © National Instruments Corp. GPIB-232CV User Manual...

  • Page 33: D Mode Operation

    Remember that because the GPIB-232CV implements a hardware handshake scheme as well as the XON/XOFF software handshake scheme if selected, serial data GPIB-232CV User Manual © National Instruments Corp.

  • Page 34: Using The Srq Feature

    GPIB-232CV receives serial data that it needs to pass on to the GPIB port. SRQ* will be unasserted when the GPIB Controller performs a serial poll on the GPIB-232CV. © National Instruments Corp. GPIB-232CV User Manual...

  • Page 35: Conditions That Assert Srq

    GPIB-232CV a GPIB Listener and it cannot be unaddressed to listen. All data transferred on the GPIB will be accepted by the GPIB-232CV and output to the serial port (even if the data GPIB-232CV User Manual © National Instruments Corp.

  • Page 36: Special Conditions In D Mode

    GPIB-232CV becomes CIC and all data received via the serial port is buffered. The data is then passed along to the GPIB device. The four modes of operation define at what point the GPIB device needs to © National Instruments Corp. GPIB-232CV User Manual...

  • Page 37: Time Termination Mode

    HP7475 GPIB plotter to an IBM-PC serial port via the GPIB-232CV and you want to draw a line, get plotter status, and then draw a circle. In BASIC, this could be done with the following commands: GPIB-232CV User Manual © National Instruments Corp.

  • Page 38: No-Swap Mode

    GPIB device is intended only to receive data. In the above example, you could use the no-swap mode to talk to the plotter if you never need to obtain status information from it. © National Instruments Corp. GPIB-232CV User Manual...

  • Page 39: Buffering And Handshaking

    CTS becomes unasserted. Note: If you use a serial cable that does not connect to CTS, CTS will not be asserted and the GPIB-232CV will not transmit data. GPIB-232CV User Manual © National Instruments Corp.

  • Page 40: Xon/Xoff

    XON character. Caution: Do not use XON/XOFF handshaking if you are transmitting binary data. Because your data could include decimal 17 or 19 (<CTRL>q or <CTRL>s), the GPIB-232CV might handshake erratically. © National Instruments Corp. GPIB-232CV User Manual...

  • Page 41: Appendix A Hardware Specifications

    640 mA typical; 750 mA max Table A-2. Environmental Characteristics Characteristic Specification Operating Temperature 10° to 40° C Storage Temperature 0° to 70° C Relative Humidity 10% to 95% noncondensing conditions Noise Emissions FCC Class A Verified © National Instruments Corp. GPIB-232CV User Manual...

  • Page 42: Table A-3. Physical Characteristics

    1.6 in. by 5.7 in. by 8.4 in. (40.6 mm by 144.8 mm by 213.4 mm) Case Material All metal enclosure Rack Mounting Single or dual kits available Weight 28 oz. (without power supply unit) GPIB-232CV User Manual © National Instruments Corp.

  • Page 43: Interfacing To A Serial Device

    D-subminiature connector with a DTE (Data Terminal Equipment) interface configuration. That is, the GPIB-232CV transmits data on pin 2 and receives data on pin 3. Table B-1 shows the signal lines supported on the GPIB-232CV. © National Instruments Corp. GPIB-232CV User Manual...

  • Page 44: Table B-1. Rs-232 Serial Port Signals

    This line establishes a reference (Signal Ground) point for all interface voltages. This signal line is asserted by the (Data Ready) GPIB-232CV to signal that it has been powered on and is ready to operate. GPIB-232CV User Manual © National Instruments Corp.

  • Page 45: Interfacing The Gpib-232Cv To A Dce

    GPIB-232CV pin 2 to DCE pin 2, pin 3 to pin 3, and so forth. Wired in this manner, the GPIB-232CV can then interact to function properly on buffer full conditions (handshake). Figure B-1 shows a properly configured DTE-to-DCE cable. Figure B-1. DTE-to-DCE Cable Configuration © National Instruments Corp. GPIB-232CV User Manual...

  • Page 46: Figure B-2. Minimum Dte-To-Dce Cable Configuration

    The GPIB-232CV connector is on the left. (Assumes that the DCE's handshaking is satisfied internally.) Figure B-2. Minimum DTE-to-DCE Cable Configuration If your application requires a custom cable, review your serial device's RS-232 characteristics and build the cable to perform the desired functions. GPIB-232CV User Manual © National Instruments Corp.

  • Page 47: Interfacing The Gpib-232Cv To A Dte

    XON/XOFF handshaking, or you can use a custom cable that will satisfy the GPIB-232CV hardware handshaking protocol. The connections for a minimum configuration null modem cable are shown in Figure B-4. © National Instruments Corp. GPIB-232CV User Manual...

  • Page 48: Figure B-4. Minimum Null Modem Cable Configuration

    Figure B-4. Minimum Null Modem Cable Configuration If a custom cable is required for your application, review your serial device's RS-232 characteristics and build the cable to perform the desired functions. GPIB-232CV User Manual © National Instruments Corp.

  • Page 49: Appendix C Application Examples

    Instruments GPIB interface board (such as the AT-GPIB) is installed in your computer and that you are familiar with the software configuration utility ibconf. Use the following procedure to set up the system the first time. © National Instruments Corp. GPIB-232CV User Manual...

  • Page 50: Figure C-1. Example Of Print Spooler Setup

    GPIB port on your PC. You can simply redirect the serial output to the GPIB device as explained in the NI-488.2 Software Reference Manual for MS-DOS which is provided with the National Instruments AT-GPIB board, but the overhead associated with the DOS calls makes this method inherently slow.
  • Page 51 After the program is compiled and linked, you can run it just like the DOS print routine. Then, as long as you are not sending an amount of data greater than the buffer size of the GPIB-232CV, the data transfer should complete in a few seconds. © National Instruments Corp. GPIB-232CV User Manual...

  • Page 52: Using The Gpib-232Cv To Connect A Hp7475 Gpib Plotter To A Pc Serial Port

    PC will be able to send data at serial rates instead of plotter rates. Therefore, your data is output to the GPIB plotter by AUTOCAD in less time than it would have taken to use the HP7475 serial plotter. GPIB-232CV User Manual © National Instruments Corp.

  • Page 53: Appendix D Customer Communication

    Filling out a copy of the Technical Support Form before contacting National Instruments helps us help you better and faster. National Instruments provides comprehensive technical assistance around the world. In the U.S. and Canada, applications engineers are available Monday through Friday from 8:00 a.m. to 6:00 p.m. (central time). In other countries, contact the nearest branch office.
  • Page 54 National Instruments for technical support helps our applications engineers answer your questions more efficiently. If you are using any National Instruments hardware or software products related to this problem, include the configuration forms from their user manuals. Include additional pages if necessary.
  • Page 55 National Instruments software product Version Configuration The problem is List any error messages The following steps will reproduce the problem...
  • Page 57 Record the settings and revisions of your hardware and software on the line to the right of each item. Update this form each time you revise your software or hardware configuration, and use this form as a reference for your current configuration. National Instruments Products • GPIB-232CV Model •...
  • Page 58 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-232CV User Manual Edition Date: April 1994 Part Number: 320109-01 Please comment on the completeness, clarity, and organization of the manual.
  • Page 59 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: Technical Publications National Instruments Corporation MS 53-02 (512) 794-5678...

  • Page 60: Glossary

    Glossary Prefix Meaning Value µ- micro- milli- kilo- mega- ° degree percent amperes Celsius hexadecimal hertz inches kilobytes of memory meters megabytes of memory ounce seconds volts volts alternating current volts direct current © National Instruments Corp. GPIB-232CV User Manual...

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