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[NI驱动程序] NI-VISA3.5Linux 美国国家仪器虚拟仪器软件架构VISA3.5Linux版下载

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    发表于 2020-3-3 15:20:25 | 显示全部楼层 |阅读模式 来自:广东省东莞市 联通

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    NI-VISA3.5Linux 美国国家仪器虚拟仪器软件架构VISA3.5Linux版下载

    NI-VISA为使用GPIB、串行、PXI和其他类型仪器的用户提供支持。
    NI-VISA是一个NI仪器驱动程序,是虚拟仪器软件架构(VISA) I/O标准的具体实现。虚拟仪器软件架构(VISA)这一标准用于配置和编程基于GPIB、VXI、PXI、串口(RS232/485)、以太网/LXI和/或USB接口的仪器系统以及故障分析。NI-VISA包括实用程序、底层控制功能和范例,可帮助您快速创建应用程序。

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    请购买附件下载查看
    VISA3.5L.txt (612 Bytes, 下载次数: 0, 售价: 10 元)

    National Instruments NI-VISA(TM) Software for Linux x86. Version 3.5.
    Copyright(c) 1995, 2005 National Instruments Corporation. All rights reserved.

    NATIONAL INSTRUMENTS HOLDS MULTIPLE COPYRIGHTS, TRADEMARKS, AND PATENTS
    FOR THIS PRODUCT.  BY DOWNLOADING AND/OR INSTALLING THIS PRODUCT, YOU AGREE
    TO THE TERMS OF THE LICENSE.txt FILE THAT RESIDES IN THE SAME DIRECTORY AS
    THIS readme.txt FILE ON THE CD AND/OR WEB SITE.  FOR PATENTS COVERING
    NATIONAL INSTRUMENTS PRODUCTS, REFER TO THE patents.txt FILE ON THE ROOT
    DIRECTORY OF YOUR CD (IF APPLICABLE) AND/OR www.ni.com/patents.


    CONTENTS OF THIS FILE
    ---------------------
    System Requirements
    Installation From the Internet
    Installation FAQs
    LabWindows(TM)/CVI Run-Time Engine
    VISA Support for Multiple GPIB-VXI Controllers
    VISA Probes for LabVIEW 7.x
    USB Issues on Linux
    NI-VISA 2.5 Improvements and Bug Fixes
    NI-VISA 2.6 Improvements and Bug Fixes
    NI-VISA 3.0 Improvements and Bug Fixes
    NI-VISA 3.1 Improvements and Bug Fixes
    NI-VISA 3.2 Improvements and Bug Fixes
    NI-VISA 3.3 Improvements and Bug Fixes
    NI-VISA 3.4 Improvements and Bug Fixes
    NI-VISA 3.5 Improvements and Bug Fixes
    Credits
    Known Issues


    SYSTEM REQUIREMENTS
    -------------------
    NI-VISA 3.5 for Linux software for the Intel x86 architecture requires
    one of the following distributions:

        Mandrakelinux 10.1 Official
        Mandriva Linux 2006
        SUSE LINUX Professional 9.2
        SUSE LINUX Professional 9.3
        Red Hat Enterprise Linux WS 3
        Red Hat Enterprise Linux WS 4

    You must use the provided INSTALL script to install NI-VISA 3.5. Manual
    installation using rpm is not supported.

    After installation, you must reboot your machine before attempting to use
    NI-VISA 3.5.  

    Refer to ni.com/linux for the most recent information about Linux
    support at National Instruments.


    INSTALLATION FROM THE INTERNET
    ------------------------------
    You should be logged in as 'root' to perform this installation.

    1) Download the installation script file "INSTALL" and the compressed tar
       file "NICVISA_.TZ" from the ftp site into a temporary directory.

    2) Type ./INSTALL to execute the install script, and follow the instructions
       as prompted.

    3) Add the following environment variables to your shell setup file as shown
       in the following example for csh. The following commands assume that
       you installed NI-VISA into /usr/local/vxipnp:

       setenv VXIPNPPATH       /usr/local/vxipnp
       setenv LD_LIBRARY_PATH  /usr/local/vxipnp/linux/bin

    Note:  If your setup file already contains the LD_LIBRARY_PATH environment
           variable, you need to append /usr/local/vxipnp/linux/bin to the end of
           the statement. The required commands may vary from those shown in the
           previous section if you are not using csh.


    INSTALLATION FAQS
    -----------------
    Q1: What action needs to be taken if I upgrade/change my kernel?

    A1: Some action is required to make the existing NI-VISA installation
        work for the new kernel. After upgrading your kernel, run
        updateNIDrivers utility as root. The utility is located in
        /usr/local/bin. Be sure to have sources for your new kernel properly
        installed on your system before running the utility. The utility
        rebuilds the driver using the new kernel sources and copies it to
        the appropriate location for the new kernel. For the changes
        to take place, you will be asked to reboot your machine after the
        utility completes.

    Q2: During installation I get a message similar to the following one:
        "Kernel source does not appear to be configured for the running kernel.
         Configuration of kernel source is required to continue installation."
        I do have kernel sources installed; is there anything else that needs to
        be done?

    A2: This problem has been seen on SUSE LINUX Professional 9.1 running the 2.6.5
        kernel or newer versions of SUSE LINUX Professional. However, it is possible
        that other distributions will require similar steps to resolve this problem.

        On SUSE LINUX Professional complete the following steps:
        1. Ensure you have installed kernel-source and kernel-syms packages
           corresponding to the version of the currently running kernel. The version
           of the currently running kernel can be determined by issuing the command
           `uname -r`.
        2. Change the directory to the /usr/src/linux- directory, where
           corresponds to the currently running kernel version.
        3. Run "make cloneconfig" as root to configure the sources for the
           currently running kernel.
        4. Run "make modules_prepare" as root to prepare the headers for
           compilation.
        5. THIS STEP IS STRICTLY OPTIONAL. Completing this step removes the
           warning:
           WARNING: Symbol version dump /usr/src/linux/Module.symvers is missing,
                    modules will have CONFIG_MODVERSIONS disabled.
           Run "make modules" as root to compile all modules and generate
           Module.symvers; this step may take 30 minutes or more to complete.
        6. Run the INSTALL script for the NI-VISA software for Linux from this
           directory.


    LABWINDOWS/CVI RUN-TIME ENGINE
    ------------------------------
    The INSTALL script now automatically installs the LabWindows/CVI Run-Time
    Engine when necessary. The NI-VISA interactive utility, VISAIC, requires the
    LabWindows/CVI Run-Time Engine 5.0.1 or later to be installed. When you
    install this utility, the INSTALL script also installs the LabWindows/CVI
    Run-Time Engine if it is not already present.


    VISA SUPPORT FOR MULTIPLE GPIB-VXI CONTROLLERS
    ----------------------------------------------
    NI-VISA supports multiple GPIB-VXI controllers in a single system. Because the
    National Instruments GPIB-VXI controller ships with a primary address of 1,
    NI-VISA automatically searches for any GPIB-VXI controllers at that address.

    If you have changed the primary address (for example, if you added a second
    GPIB-VXI controller to your system, and set the address of the second
    controller to 9), or if you have a GPIB-VXI controller from another vendor,
    then you need to use the VISA configuration utility so NI-VISA can find it.
    This app's path is /linux/NIvisa/visaconf.  While in the Resource
    Editor, click the 'Add' button to add a new resource.  Specify a valid
    resource name for the new controller, such as GPIB-VXI2::0::INSTR.  You will
    then be prompted for the GPIB board number and the GPIB-VXI's primary and
    secondary addresses.  For most users, the only number that will change
    (from the default selections) is the primary address (for the above example,
    you would change it to 9).  Click 'OK' to add this new resource, and then
    select the File>>Save menu option to save this to the NI-VISA database.

    If you are using a GPIB-VXI command module from another vendor, you also need
    to obtain and install that vendor's VISA GPIB-VXI component.

    If you have a GPIB device at primary address 1 and that device does not
    recognize "*IDN?", you should disable the GPIB-VXI auto-detect feature in
    visaconf on the Settings tab.


    VISA PROBES FOR LABVIEW 7.x
    ---------------------------
    The VISA probes for LabVIEW 7.x greatly extend the amount of relevant
    information displayed when using LabVIEW probes on VISA refnums. They are used
    automatically by LabVIEW in place of the generic probe when they are
    installed.

    The NI-VISA installer will install the probes for LabVIEW 7.1. However,
    if you are using LabVIEW 7.0, you can download and install them yourself.
    To install them, download them from "ftp.ni.com/support/visa/labview/probes/"
    and copy them into "/vi.lib/_probes/default/VISA/" where
    is the installation directory of LabVIEW.


    USB ISSUES ON LINUX
    -------------------
    NI-VISA relies on a Linux kernel feature for its USB support. This feature
    is called "usbfs", and on older Linux kernels was referred to as "usbdevfs".
    For NI-VISA to support USB devices, this feature must be present and
    mounted (like a virtual filesystem). This is supported in most major Linux
    distributions such as Red Hat, SuSE, and Mandrake. You may use the "mount"
    command to display what filesystems are currently mounted to see if your
    system currently supports this feature.

    Also, the VISA user must have write accress to the file that represents
    the USB device, which is typically somewhere in a subdirectory within
    "/proc/bus/usb". If this is not the case, the USB device is not
    accessible by VISA (it will not be found using viFindRsrc and viOpen will
    fail). The default configuration on most systems is that the 'root' user
    has write access; however, no other user has this access.

    There are a number of options that you can take to provide a non-root
    user access to a USB device.

    1) Use the hotplug package. This package is installed by default on most
    distributions including Red Hat, SuSE, and Mandrake. The hotplug package
    allows the user to run scripts for a specific USB device based on
    characteristics such as Vendor ID (VID) and Product ID (PID). If the
    hotplug package exists, the NI-VISA Installer by default will install
    scripts to give all users write access to all USB TMC devices and a
    framework for USB RAW devices. To add write permissions for a specific
    USB RAW device, simply run the included script:
    "/linux/NIvisa/USB/AddUsbRawPermissions.sh".
    For more information on the hotplug package, please visit:
    http://linux-hotplug.sourceforge.net

    2) "usbfs" (formerly known as "usbdevfs") may be mounted with the option
    "devmode=0666". This gives all users read and write access to all USB
    devices.

    3) The 'root' user may add write permissions to the file that represents
    the USB device which is typically somehere in a subdirectory within
    "/proc/bus/usb". Unfortunately, these permissions will be lost if the
    device is unplugged and then plugged back in. Because of this, this
    approach is not recommended.


    NI-VISA 2.5 IMPROVEMENTS AND BUG FIXES
    --------------------------------------
    GPIB and Serial performance have been improved over Version 2.01.

    If you are using the GPIB-ENET controller, the previous version of NI-VISA
    would take a minute or more to time out if a GPIB-ENET controller were not
    connected or powered on. The timeout is now much shorter.

    This version of NI-VISA incorporates general bug fixes and improvements for
    GPIB-VXI. The NI-VISA code instrument will now load properly in configurations
    where it previously failed.

    If a GPIB-VXI chassis is reset while an application has VISA loaded, the
    GPIB-VXI would previously become accessible only as GPIB but not GPIB-VXI.
    This release of NI-VISA will now properly re-detect the GPIB-VXI.

    Fixed bug with the GPIB-VXI and hardware triggers.

    This version of NI-VISA incorporates general bug fixes and improvements for
    formatted I/O, especially with very large buffers and with the following
    modifiers: "%b", ",", "#", "!ob", "!ol", and "%[".

    The documentation for viPrintf and viFlush better describes when formatted
    I/O buffers are sent. The documentation for viScanf better describes the ","
    and "#" modifiers.

    Fixed bug with the Serial End Last Bit mode for reads and writes.


    NI-VISA 2.6 IMPROVEMENTS AND BUG FIXES
    --------------------------------------
    Fixed bug with enabling the exception event on GPIB-VXI.

    viScanf %f modifier will now properly scan numbers bigger than 2^31-1.

    viGpibPassControl now returns an error if the primary and/or secondary address
    is invalid.

    In VXI, mapping a trigger line already mapped produced VI_ERROR_LINE_IN_USE
    (0xBFFF0042), instead of VI_SUCCESS_TRIG_MAPPED (0x3FFF007E).  This now
    returns the expected status code.

    In VXI and GPIB-VXI, using viMoveInXX and viMoveOutXX with a negative
    value for the length parameter would occasionally cause the system to reboot.
    This now returns the error code VI_ERROR_INV_LENGTH (0xBFFF0083) instead.

    viReadToFile now writes the correct data to the file.

    For TCP/IP SOCKET and INSTR resources, the openTimeout specified in viOpen
    is now used as the network timeout during the connection sequence.  The
    default openTimeout, if not specified, is 2 seconds (2000 milliseconds).

    For TCP/IP INSTR resources, trying to do a viRead or viReadAsync on a buffer
    with a size larger than a few kilobytes, would either return an error or
    occasionally crash.  This has been fixed.

    viFindRsrc would previously reject certain valid expressions and accept
    certain invalid expressions, usually involving spaces.  This has been fixed.

    The NI-VISA driver would not initialize properly on libc version 5.4.44.
    This has been fixed.

    If an application called fork, the NI-VISA driver didn't initialize
    properly in the child process.  Exiting either the child or parent process
    caused the other's VISA calls to stop working.

    In Serial, we now support baud rates higher than 38400.  Specifically,
    the values 57600, 115200, 230400, and 460800 are now valid as long as the
    system driver allows them.

    In Serial, if data arrives at the same time as viTerminate is called or a
    timeout occurs, the data now gets read.  If this satisfies the read request,
    then the read operation returns a successful status.

    Enabling VI_EVENT_SERVICE_REQ for VI_HNDLR with a GPIB-ENET controller
    would cause an application to hang if an SRQ event arrived while I/O was
    in progress.  This has been fixed.

    Multiple VISA processes using GPIB could not perform I/O simultaneously
    even if the I/O was to different controller cards.  This has been fixed.
    Multiple I/O requests to the same GPIB controller will still be handled
    sequentially due to the nature of GPIB.

    Calling viOpen with access mode 1 (exclusive lock) did not work as expected
    on GPIB interface sessions.  This has been fixed.


    NI-VISA 3.0 IMPROVEMENTS AND BUG FIXES
    --------------------------------------
    When you open a VISA session to GPIB0::INTFC and immediately query the
    attribute VI_ATTR_GPIB_SRQ_STATE, it previously returned the value
    VI_STATE_UNASSERTED.  It now returns VI_STATE_UNKNOWN because the SRQ line
    cannot be monitored if the interface is not yet CIC.  The correct state is
    returned after calling viGpibSendIFC.

    For a TCPIP INSTR resource, calling viTerminate did not work correctly.

    For a TCPIP INSTR resource, calling viRead or viWrite with a large buffer
    occasionally would return an error without transmitting the entire buffer.

    For a TCPIP INSTR resource, opening and closing sessions to multiple host
    addresses would cause NI-VISA to crash.

    For a TCPIP INSTR resource, calling viLock with a timeout longer than the
    I/O timeout for that session could cause NI-VISA to return VI_ERROR_TMO.

    For a TCPIP SOCKET resource, viReadAsync was not implemented.  Now it is.

    For a Serial INSTR resource, viOpen will now open a port if the process
    that had been using that port exited ungracefully (such as with Ctrl-C).
    The previous behavior had been that viOpen would return VI_ERROR_RSRC_BUSY.

    For a Serial INSTR resource, if you enabled RTS/CTS flow control and then
    manually tried to set the state of the RTS line, some operating systems
    would generate VI_ERROR_NSUP_ATTR while others would return VI_SUCCESS but
    not actually modify the state of the line.  Neither of these behaviours was
    correct.  Now NI-VISA will return VI_ERROR_INV_SETUP in this case on all
    operating systems.

    For a Serial INSTR resource, NI-VISA now supports the baud rates 50, 75,
    134, 200, 1800, and 576000.  This list is now identical to the OS list.

    For a Serial INSTR resource, if a binding existed to a valid file/device
    but that file/device was not really a serial port, then NI-VISA would
    not close the handle.  Repeated calls to viFindRsrc or viOpen would cause
    the process to eventually run out of file handles.  This has been fixed.

    If you had a GPIB device at primary address 1 that generated a response to
    *IDN? that was longer than 100 characters, viFindRsrc would occasionally
    crash.  This has been fixed.

    viFindRsrc would crash on a complex expression with multiple "|" symbols.
    This has been fixed.

    viScanf %# modifier will now output the number of characters put into the
    buffer excluding the terminating null character.  This applies to the %#s,
    %#t, %#T, and %#[] modifiers. NI-VISA treats the maximum array size
    (specified on input) as the total buffer size including the terminating null
    character.

    Once viScanf returned VI_ERROR_TMO, it would no longer work properly on
    that session.

    Calling viFindRsrc repeatedly when logged in as root would eventually run
    out of file descriptors.  This has been fixed.

    The attributes VI_ATTR_MANF_NAME and VI_ATTR_MODEL_NAME are now correctly
    implemented for GPIB-VXI regardless of whether NI-VXI is installed.

    The maximum simultaneous number of GPIB-VXI controllers supported by
    NI-VISA has changed from 10 to 32.

    When calling viWaitOnEvent repeatedly with a timeout of 0 (immediate), some
    interfaces and event types would still consume excessive CPU time.  Now doing
    this will yield the CPU regardless of the interface or event type.

    viFindRsrc would return VI_ERROR_INV_EXPR if the expression exceeded 255
    characters.  Now it will accept resource expressions of any length.

    Calling viFindRsrc would always assert REN on each GPIB board after finding
    devices.  Now viFindRsrc will re-assert REN on each board only if there is
    at least 1 open VISA INSTR session on that board.

    For a TCPIP SOCKET resource, using viRead with termchar enabled was much
    slower than reading the exact number of bytes.  The performance of using
    termchar with viRead is now much better than it was.


    NI-VISA 3.1 IMPROVEMENTS AND BUG FIXES
    --------------------------------------
    Reading data from a Serial port was slow.  The performance has improved.

    Using the Serial Break VI from LabVIEW did not work with remote NI-VISA.
    This has been fixed.

    For a Serial INSTR resource, if a parity or framing error occurred, NI-VISA
    would not return the correct error condition.  This has been fixed.

    The hostname "localhost" or the IP address "127.0.0.1" did not work properly
    with remote NI-VISA.  Only the DHCP name or network IP address would work.
    This has been fixed.

    Calling viEnableEvent on a remote VISA session would leak memory in the
    server.  This has been fixed.

    The remote NI-VISA server did not properly validate a hostname with an
    underscore.  This has been fixed.

    Calling viOpen on a remote NI-VISA resource did not honor the openTimeout
    parameter.  This has been fixed.

    Calling viClose on an ethernet resource would leak a socket handle.  This
    has been fixed.

    The global attributes on a GPIB INTFC resource were not properly shared
    across sessions.  This has been fixed.

    Using the system call "fork" on a process with VISA loaded would sometimes
    cause the forked process to hang.  This has been fixed.


    NI-VISA 3.2 IMPROVEMENTS AND BUG FIXES
    --------------------------------------
    Added complete support for USB (both RAW and INSTR).

    Added a new UNINSTALL script for Linux.  This UNINSTALL script is installed
    in the /usr/local/vxipnp/linux/NIvisa directory.

    Calling viPrintf on a remote VISA session would return VI_ERROR_IO instead
    of VI_ERROR_RSRC_LOCKED when the remote resource was locked.  This is fixed.

    The VISA Interactive Control utility (NIvisaic) now displays an error message
    box when viFindRsrc returns an error.


    NI-VISA 3.3 IMPROVEMENTS AND BUG FIXES
    --------------------------------------
    The PXI/PCI INSTR Resource is now supported on Linux.  PXI specific
    functionality is not supported at this time.  You must generate an INF file
    for your PXI/PCI device with the VISA Driver Development Wizard on Windows
    using NI-VISA 3.3 or higher.  INF files generated with older versions of
    NI-VISA are not supported on Linux.  You can find installation instructions
    in the generated file.  This is a new feature.

    For USB RAW sessions, now interrupt-out endpoints may be used for viWrite.

    For USB RAW sessions, viReadAsync is now implemented.

    Opening a VISA session to a resource and then exiting the application
    without closing either the VISA session or the Resource Manager
    could crash the application.  This is fixed.

    viFindRsrc could be very slow if the Serial Passport is enabled.
    This is fixed.

    viFindRsrc would crash when given long strings that use remote NI-VISA.
    This is fixed.

    Calling viMoveAsync on a remote VISA session would return an error.
    This is fixed.

    For Serial INSTR sessions, viClear previously would flush (discard) the I/O
    buffers and then send a break.  According to the VISA spec, VISA must flush
    (discard) the I/O output buffer, send a break, and then flush (discard) the
    I/O input buffer.  This is fixed.

    viScanf and variants did not support the "%u" identifier for arrays.
    This is fixed.

    viPrintf and variants did not support the "%zy" and "%Zy" identifiers for
    floating point data.  This is fixed.

    viPrintf and variants previously generated "NaN", "+Inf", and "-Inf".  It
    now generates "NAN", "INF", and "NINF", respectively.

    viScanf and variants did not correctly interpret the input values "NAN",
    "INF", and "NINF". This is fixed.

    The function viUsbControlIn would report an incorrect return count when it
    read fewer bytes than requested.  This is fixed.


    NI-VISA 3.4 IMPROVEMENTS AND BUG FIXES
    --------------------------------------
    Added support for PXI system identification, trigger routing, and
    reservation. PXI-1006 trigger routing is not supported.
    Type "man nipxiconfig" for more information.

    The VISA Driver Development Wizard is now supported on Linux. It is
    located in /usr/local/vxipnp/linux/NIvisa. Previously, the wizard was
    supported on Windows only.

    For PXI INSTR sessions, non National Instruments PXI/PCI devices would not
    be correctly detected and hence communication to them was not possible.
    This is fixed.

    Performing asynchronous I/O to a remote VISA resource would return an
    incorrect transfer count and/or data. This is fixed.

    For USB RAW sessions, communication with non-zero control endpoints is now
    supported with the use of VI_ATTR_USB_CTRL_PIPE.

    For USB RAW sessions, the default setting for VI_ATTR_USB_END_IN has been
    changed from VI_USB_END_SHORT to VI_USB_END_SHORT_OR_COUNT.

    For USB RAW sessions, viReadAsync would fail if the transfer size was over
    8KB and not a multiple of the maximum packet size of the endpoint.
    This is fixed.

    For USB RAW sessions, changing the USB Alternate Setting on a USB
    Interface number other than 0 would fail. This is fixed.

    For TCP/IP SOCKET sessions, VI_ATTR_SUPPRESS_END_EN set to VI_TRUE did not
    work in all cases. This is fixed. The default attribute setting for
    VI_ATTR_SUPPRESS_END_EN on TCP/IP SOCKET sessions is now VI_TRUE.

    For PXI INSTR sessions, when enabling for VI_EVENT_PXI_INTR using VI_QUEUE,
    viDiscardEvents did not work properly. This is fixed.

    For GPIB INSTR sessions, when using a GPIB-USB controller, if you unplug
    and replug the GPIB-USB cable, you would have to exit and restart your
    application to communicate with it again. This is fixed.


    NI-VISA 3.5 IMPROVEMENTS AND BUG FIXES
    --------------------------------------
    For TCP/IP INSTR sessions, viWrite would fail if the transfer size was over
    8KB. This is fixed.

    Significantly optimized PCI interrupts and block moves.

    Significantly optimized calls to viFindRsrc and viOpen for all interface
    types.

    In some cases, floating point formatted I/O would hang. This is fixed.

    For Serial INSTR sessions, a call to viSetBuf, which did not modify the
    buffer size, still returned VI_SUCCESS. viSetBuf now returns a warning
    indicating the operation is not supported on the current platform.


    CREDITS
    -------
    This product includes components that use the socket++ library.  The library
    is Copyright(C) 1992-1995 Greg Lavender (University of Texas) and
    Gnanasekaran Swaminathan (University of Virginia).  All rights reserved.


    KNOWN ISSUES
    ------------
    The new PXI/PCI Express attributes are not yet implemented.

    If your application crashes or terminates abnormally, NI-VISA cannot always
    clean up properly.  In order to run another VISA application, you should
    first run the application /linux/NIvisa/viclean.  This deletes
    any remaining shared memory segments and system semaphores.

    The GPIB INSTR and GPIB INTFC resources depend on the presence of an NI-488
    driver installed on the system.  For PCI-GPIB products on Linux, NI-VISA
    requires NI-488.2 for Linux version 2.3 or higher.  For GPIB ethernet
    products on Linux, NI-VISA requires NI-488.2 for Linux version 2.2 or higher.

    For USB resources, there are issues using interrupt-in endpoints. These
    issues vary depending on the version of the Linux kernel and the USB
    controller hardware that is on the system. On 2.4.x kernels, only one
    packet may be requested at a time. Hence, if the value for the attribute
    VI_ATTR_USB_MAX_INTR_SIZE exceeds the maximum packet size of the current
    interrupt-in endpoint, interrupts will not be received. Also, depending
    on the chipset of the USB controller hardware, it is possible for a
    kernel panic (system crash) to occur while attempting an interrupt-in
    transfer. These issues have been fixed in 2.6.x kernels. However, in some
    2.6.x kernels, interrupt-in transfers will not work on EHCI (USB 2.0)
    controllers with USB 2.0 devices.

    On some Linux desktop environments, visaconf and NIvisaic may not respond
    to keyboard input while 'Num Lock' is on. To avoid this problem, turn
    'Num Lock' off.
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