NI-VISA3.1Windows 美国国家仪器虚拟仪器软件架构VISA3.1 Windows版下载

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NI-VISA3.1Windows 美国国家仪器虚拟仪器软件架构VISA3.1 Windows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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VISA3.1W

National Instruments NI-VISA(TM) Software for Windows. Version 3.1.
Copyright(c) 1995-2004 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
---------------------
Installing and Uninstalling NI-VISA 3.1
LabWindows(TM)/CVI(TM) Run-Time Engine
Support for new VISA Features
PXI Geographic Addressing Support
PXI Resource Naming
PXI System Configuration
Support for Multiple GPIB-VXI Controllers
Support for Agilent/HP Controllers
Using viPeekXX/viPokeXX Macros
NI-VISA 2.5 Improvements and Bug Fixes
NI-VISA 2.5.2 Improvements and Bug Fixes
NI-VISA 2.6 Improvements and Bug Fixes
NI-VISA 2.6.1 Improvements and Bug Fixes
NI-VISA 3.0 Improvements and Bug Fixes
NI-VISA 3.0.1 Improvements and Bug Fixes
NI-VISA 3.1 Improvements and Bug Fixes
Credits
Known Issues


INSTALLING AND UNINSTALLING NI-VISA 3.1
---------------------------------------
NI-VISA 3.1 does not support Windows 9x.  If you need to run your VISA
application on Windows 95, you must install NI-VISA 2.6.1 or lower.
If you need to run your VISA application on Windows 98 or Windows Me,
you must install NI-VISA 3.0.1 or lower.

Before you install NI-VISA 3.1, we strongly recommend that you uninstall
any versions of VISA prior to NI-VISA 2.0.1.  NI-VISA 3.1 should upgrade
properly over NI-VISA versions 2.0.1 through 3.0.1.

After uninstalling NI-VISA, some DLLs and executables may remain in the
NI-VISA directories. To complete the uninstall process, you must restart your
machine. Note: the uninstaller application will not notify you when rebooting
is necessary. If you plan to re-install NI-VISA, you should always reboot
the machine after running the uninstaller.


LABWINDOWS/CVI RUN-TIME ENGINE
------------------------------
The Setup program now automatically installs the LabWindows/CVI Run-Time
Engine when necessary. The NI-VISA interactive utility, VISAIC, requires the
LabWindows/CVI Run-Time Engine 6.0 or later to be installed. When you install
this utility, Setup also installs the LabWindows/CVI Run-Time Engine if it is
not already present.


SUPPORT FOR NEW VISA FEATURES
-----------------------------
Starting with NI-VISA 2.6, we now support remote NI-VISA access.  Any machine
with the NI-VISA server can export its resources to other NI-VISA clients.
Configure client and server settings in Measurement & Automation Explorer.
To use a remote VISA resource, the name is a URL including the machine name or
IP address, followed by the traditional VISA resource name.  Examples include:
"visa://machine.domain.com/GPIB0::5::INSTR"
"visa://1.2.3.4/ASRL2::INSTR"

We have added support for the PXI::MEMACC resource.  This resource supports
viMemAlloc and viMemFree for allocating blocks of physically contiguous locked
memory on your controller.  You can access that memory with viInX/viOutX,
viMoveInX/viMoveOutX, and viMapAddress/viPeekX/viPokeX/viUnmapAddress.  Use
the address space VI_PXI_ALLOC_SPACE (9).  viFindRsrc will not detect this
resource by default, but you can still call viOpen with that resource string.
To make it appear in the list returned by viFindRsrc, change the PXI setting
in Measurement & Automation Explorer in Tools>>NI-VISA>>VISA Options.

IVI driver developers can use the new VISA COM API.  NI-VISA 3.1 does not yet
document this API, so only those developers familiar with the specification
should use it in this release.  The relevant COM classes for getting started
include IResourceManager and IVisaSession, registered in GlobMgr.dll.  The
VISA COM API is functionally equivalent to the VISA C API.  It does not add
features; it is just another language interface.  The VISA COM API can only
be installed if you have Internet Explorer 4.01 or higher on your system.

Starting with NI-VISA 3.0, we added support for USB devices without their own
Windows drivers.  To use NI-VISA for such a device, you must first run the
VISA Driver Development Wizard and create an INF file for binding your device
to the NI-VISA driver. The resource format you use to open such a device is:
"USB::::::[::]::RAW".  To use
this functionality in your C program, you must #define NIVISA_USB before
including the visa.h header file.

Starting with NI-VISA 3.0, we added several new features for PXI resources.
First, NI-VISA now includes the ability to determine a PXI device抯
geographical address, such as its chassis and slot number, using two new
PXI attributes.  Second, NI-VISA includes two new resource name formats that
improve upon the existing naming convention.  Finally, Measurement and
Automation Explorer (MAX) now includes a PXI System tree view for enabling
geographic addressing and other features.


PXI GEOGRAPHIC ADDRESSING SUPPORT
---------------------------------
Starting with NI-VISA 3.0, we now support geographic addressing for PXI
resources.  Geographic addressing includes the ability to identify the
chassis number and slot number for a PXI module.  To support geographic
addressing, the following attributes have been implemented on the PXI INSTR
resource type:

VI_ATTR_SLOT - specifies the PXI slot number for instrument
VI_ATTR_PXI_CHASSIS - specifies the PXI chassis number for the instrument

Using these attributes, PXI resources can be located based on their geographic
address in a system.  For example, the resource description string
"PXI?*INSTR{VI_ATTR_PXI_CHASSIS==1 && VI_ATTR_SLOT==3}" can be used to
locate a PXI device in chassis 1, slot 3.


PXI RESOURCE NAMING
-------------------
Starting with NI-VISA 3.0, we now include a new PXI resource format based on
the traditional bus number/device number/function number addressing scheme:

"PXI0::-[.]::INSTR"

For example, given a PXI device at bus 2, device number 17, function
number 1, the corresponding resource name for this device would be
"PXI0::2-17.1::INSTR".

In this new resource name, the "0" in "PXI0" represents the PCI interface
number for the PXI system.  Currently, this interface number is always "0".
Note that the interface number is not necessarily the same as a device's
PCI bus number.

Of course, NI-VISA continues to support the legacy PXI naming convention:

"PXI::[::funcNum]::INSTR"

Note that, for a single-function PXI device on PCI bus 0, both of these
resource formats yield an identical string.


PXI SYSTEM CONFIGURATION
------------------------
In order to enable geographic addressing, a PXI system description file
(pxisys.ini) must be present on the system.  Beginning with NI-VISA 3.0,
Measurement and Automation Explorer (MAX) includes the ability to identify
components in a PXI system.  Through the hardware identification process, MAX
collects the information necessary to generate a PXI system description file.

Follow these steps to configure your PXI system for geographic addressing:

1) Launch MAX.
2) Expand the "Devices and Interfaces" folder.  If you are configuring a
   LabVIEW RT system, locate that system's "Devices and Interfaces" folder
   under the "Remote Systems" view.
3) Identify your PXI controller.  Locate the "PXI System 0" item.  "PXI
   System 0" represents the PXI system and its controller.  To identify this
   controller, right-click on "PXI System 0" and use the "Identify As"
   feature, selecting your controller from the resulting list.
   NOTE: If you are using an external PC to control the PXI system via a PXI
         bridge like MXI-3, select this option from the menu.
4) Identify your PXI chassis.  Expand the "PXI System 0" view to locate your
   PXI chassis in the system.  For embedded controllers, a chassis is added
   when the controller has been identified.  For a chassis controlled via
   MXI-3, these chassis are added automatically by the software.  To identify
   a chassis, right-click on the chassis and use the "Identify As" feature,
   selecting your chassis from the resulting list.  Chassis will be assigned
   a number based on the PCI bus number that the chassis resides on.

Once the controller and chassis have been identified, a pxisys.ini file is
created.  This file conforms to the PXI specification, and it is used to
allow drivers (including NI-VISA) and other configuration software to enable
geographic addressing and other features of PXI.  On Windows, this file is
placed in the Windows directory.  For LabVIEW RT systems, the pxisys.ini file
is automatically copied to the remote system's "c:\ni-rt\system" directory.


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 primary address of the second
controller to 9), or if you have a GPIB-VXI controller from another vendor,
you need to add it using Measurement & Automation Explorer so NI-VISA can find
it. Right-click on "Devices and Interfaces" and select "Create New..." to add
a new GPIB-VXI interface. Specify the controller's GPIB primary and secondary
addresses, as well as the GPIB board to which it is connected. Then specify a
new GPIB-VXI interface number and its logical address (usually 0).

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
Measurement & Automation Explorer from the Tools>>NI-VISA>>VISA Options menu.


SUPPORT FOR AGILENT/HP CONTROLLERS
----------------------------------
NI-VISA now works with Agilent/HP GPIB and VXI controller cards. To
use this feature, go into the Measurement & Automation Explorer, select
"Tools>>NI-VISA>>VISA Options", choose the Passports tab, and enable the
NiVisaTulip.dll Passport. NI-VISA will automaticaly find and access any
GPIB or VXI devices. However, NI-VISA will not configure the Agilent/HP
hardware; you must still do that with the Agilent/HP I/O Config utility.

If you have both National Instruments and Agilent/HP controllers in the same
system, you must configure the cards at different system addresses, such as
GPIB0 and GPIB1. If both vendors try to use the same interface address,
NI-VISA will report an error from viFindRsrc or VISA Find Resources.


USING viPeekXX/viPokeXX MACROS
------------------------------
Users who want to use the viPeekXX/viPokeXX macros for platforms on which the
macros are available must define a macro called NIVISA_PEEKPOKE before
including "visa.h". Note that the macros are currently available
on only the following platforms:

- Win32 (All C compilers)
- Solaris (LabWindows/CVI only)

If you have used these macros with a version of NI-VISA prior to 2.0, your
application will continue to run, but the peek/poke performance will decrease.
You should relink with the libraries supplied with this installation to regain
the prior peek/poke performance.


NI-VISA 2.5 IMPROVEMENTS AND BUG FIXES
--------------------------------------
GPIB performance has improved. Its performance is now identical to NI-488.

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.

Serial performance has improved. It no longer consumes excessive CPU time
during read operations when the data is not immediately available.

The VISA serial driver now works with baud rates higher than 256000. NI-VISA
will allow any baud rate that the Windows driver will accept.

If you set the Flow Control serial setting in T&M Explorer, it was not stored
properly. This has been fixed in Measurement & Automation Explorer.

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.

Fixed bug for PXI in Windows NT where it would occasionally crash on exit.

Fixed bug for PXI where repeated calls to viOpen or VISA Open would
occasionally return an undocumented status code.

The documentation now includes resource strings and valid parameter values
for PXI operations.

The PXI Driver Development Wizard will now also generate a .inf file for
Windows 2000.

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.

Added capability to see low-level VISA formatted I/O buffers in NI Spy.

Improved NI Spy performance when capturing calls, logging to disk, and opening
files.

Fixed bug with starting NI Spy while DLLs are in use.

Fixed bugs in NI Spy where invalid buffer addresses or invalid buffer sizes
would previously cause NI Spy to crash.

Fixed installer bugs where the PATH and VXIPNPPATH environment variables were
occasionally incorrect, especially with long directory names on Windows 95/98.


NI-VISA 2.5.2 IMPROVEMENTS AND BUG FIXES
----------------------------------------
Fixed bug with enabling the exception event on GPIB-VXI.

Fixed bug with GPIB-USB-A and NI-VISA on Windows 2000.

The performance of viFindRsrc has improved.

On Serial reads where the data is not immediately available, the CPU usage is
now lower.

Fixed bug with using NI-VISA on Windows 2000 as Guest users.

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

By default, viFindRsrc will return only the PXI/PCI instruments for which you
created INF files using the PXI driver development wizard. But you can open
sessions to all resources that you were able to find using earlier versions of
NI-VISA. To enable viFindRsrc to return all available resources, change the PXI
setting in Measurement & Automation Explorer in Tools>>NI-VISA>>VISA Options.

Fixed bug with Measurement & Automation Explorer with GPIB on Windows 2000.

The PXI Driver Development Wizard will now also generate a .inf file for
LabVIEW RT.


NI-VISA 2.6 IMPROVEMENTS AND BUG FIXES
--------------------------------------
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 PXI, 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.

In PXI, viMoveInXX and viMoveOutXX would access the same location rather than
incrementing the address.  This has been fixed.

In PXI, if the device memory window was less than 4KB and the Windows OS put
it at an offset that was not aligned on a 4KB boundary, NI-VISA would not be
able to access it properly.  This has been fixed.

In PXI, the ability to query VI_ATTR_MANF_NAME and VI_ATTR_MODEL_NAME was not
implemented.  This has been added.  You should generate new INF files using
the new version of the PXI Driver Development Wizard.  Many supported cards
have already been added to the NI database and should be listed in MAX.  Any
devices using the new INF files will also have their names listed properly.

In PXI, if the device model code began with a zero (0), using viEnableEvent
would return an error.  This has been fixed.

If you opened and closed a parallel port quickly, viOpen would occasionally
return VI_ERROR_SYSTEM_ERROR (0xBFFF0000).  This problem may still occur, but
it is the result of an OS error indicating the resource is busy.  In this
case, NI-VISA now returns VI_ERROR_RSRC_BUSY (0xBFFF0072) instead.

If you wrote data to a parallel port on Windows NT/2000, the timeout was
being ignored.  This has been fixed.

In Serial, if you tried to set 8 data bits and 1.5 stop bits, NI-VISA would
return the error VI_ERROR_SYSTEM_ERROR (0xBFFF0000).  On Windows this is an
invalid combination, because 1.5 stop bits is supported only with 5 data bits.
With 8 data bits, you may use either 1 or 2 stop bits only.  In this case,
NI-VISA now returns VI_ERROR_INV_SETUP (0xBFFF003A) instead.

viReadToFile now writes the correct data to the file.

If you created a TCP/IP VXI-11 device entry in Measurement & Automation
Explorer, and then exited and restarted MAX, that device would no longer
show up.  This has been fixed.

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 SOCKET resources, trying to set the attribute VI_ATTR_TCPIP_NODELAY
to VI_TRUE would return an error on Windows 98.  This has been fixed.

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.

In Measurement & Automation Explorer, the GPIB resources could not be dragged
into LabVIEW 6i.  This has been fixed.

After uninstalling NI-VISA 2.5.x, Measurement & Automation Explorer would
display a VISA Error.  This has been fixed.

Fixed installer bugs where the PATH and VXIPNPPATH environment variables were
incorrect, when using directory names with spaces on Windows 95/98.

NI Spy would crash if the application being spied upon had a pathname greater
than 72 characters.  This has been fixed.

Calling viTerminate on a Serial transfer would return the incorrect number
of bytes transferred up to that time.  This has been fixed.

Calling viTerminate on a Serial transfer would cause subsequent transfer
attempts (read or write) on the same session to appear to complete
prematurely.  This has been fixed.

Fixed LabWindows/CVI function panel help.  Added descriptions of the new
resource string formats and event types that NI-VISA 2.5 and higher supports.

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

Calling viUninstallHandler from the callback is not recommended, but is
supported.  Doing this in NI-VISA 2.5.2 would take 15 seconds.

Calling viEnableEvent on VI_EVENT_SERVICE_REQ for GPIB would not generate
an event if the SRQ line was already asserted.  This has been fixed.

viFindRsrc now automatically detects parallel ports other than just LPT1.

In Serial, RS-485 does not support all the lines that RS-232 does.  Querying
the attributes corresponding to those lines will return VI_UNKNOWN_STATE.

In Serial, the DTR line was always asserted on viOpen.  For RS-232, that
continues to happen.  For RS-485 we no longer assert the line automatically.

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.

Improved NI Spy performance.  Each call now takes less space in memory and
on disk.  Large files now load much faster.  When loading files larger than
the call history depth, there is now an option to load only the first or
last calls, instead of the entire file.

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


NI-VISA 2.6.1 IMPROVEMENTS AND BUG FIXES
----------------------------------------
NI-VISA is now partially localized for Japanese.  The localized portions
include the installer, NI Spy, and the VISA provider in MAX.

In PXI, handling interrupts using the VISA queue is now faster on LabVIEW RT
and Windows 2000/NT/XP.

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.

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.

Opening and closing a serial port in a loop on Windows 2000/NT/XP would
cause a memory leak.

LabVIEW RT now supports the attribute VI_ATTR_ASRL_WIRE_MODE.


NI-VISA 3.0 IMPROVEMENTS AND BUG FIXES
--------------------------------------
The driver now works properly with Fast User Switching on Windows XP/2000.

For a PXI INSTR resource, we now support PXI/PCI devices that rely on the
subvendor ID and/or the subvendor model code.  To use this functionality
you must create a new .INF file with the VISA Driver Development Wizard.
The attributes VI_ATTR_PXI_SUB_MANF_ID and VI_ATTR_PXI_SUB_MODEL_CODE
are no longer supported by the VISA driver.  The correct attributes to
query are now VI_ATTR_MANF_ID and VI_ATTR_MODEL_CODE.  These will return
the primary vendor information if no subvendor information is present,
and they will return the subvendor information if it is present.

For a PXI MEMACC resource, viMemFree now frees all memory correctly.

For a Serial INSTR resource, viOpen on both Windows and LabVIEW RT will now
accept "COMx" as a valid resource name even if MAX has not yet been run.

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, viWriteAsync was not implemented.  Now it is.

For a Serial INSTR resource, multiple sessions to the same port caused
weird behavior if you tried to both write and read data simultaneously.
This has been fixed.

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, the RS-485 wire mode attribute now works
properly on Windows XP/2000.

In GPIB, the attribute VI_ATTR_INTF_INST_NAME would report an unknown
board type for some GPIB-USB and GPIB-ENET controllers.  The symptom was
also visible in the VISA Interactive Control utility.  This attribute now
reports the correct information.

In GPIB, the implementation of viFindRsrc could take up to 10 seconds if
you had NI-488.2 version 2.0 installed.  The symptom was also visible in
LabVIEW when you dropped the first VISA resource control on the front
panel.  This now takes less than 1 second on most machines.

NI Spy would occasionally incorrectly report an output jobID of 0 for
viReadAsync or viWriteAsync even though the operation completed
successfully with a valid non-zero jobID.

NI Spy would not restore the window location on a monitor other than the
primary monitor.  This now works as expected.

If you ran MAX as a guest user and edited the Passport settings, the new
settings could not be saved to the registry, but MAX did not generate a
warning.  This has been fixed, and you will now get a warning.

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

The remote NI-VISA server could not be started on the same machine as
the remote DAQ server because they both used the same port.  Now the
remote NI-VISA server uses port 3537 by default.

viFindRsrc would crash on a complex expression with multiple "|" symbols.
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.

Some VISA COM components were not being correctly registered.

The VISA COM API would return an incorrect string from ReadString if the
number of bytes read was exactly what was requested.

The VISA COM API would not return output string parameters correctly if
the variable passed into the function was uninitialized or had a garbage
value.  This problem was normally only seen from C++ when using a raw BSTR
instead of CComBSTR.  This has been fixed.

In GPIB, the implementation of viFindRsrc on LabVIEW RT would find GPIB
resources only on GPIB0.  It now finds GPIB resources on any configured
GPIB interface number.

Calling viUnmapAddress when using an Agilent HP-E1406A GPIB-VXI controller
would cause the application to crash.  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.

The VISA Driver Development Wizard (formerly known as the PXI Driver
Development Wizard) now allows multiple logical-OR PXI interrupt conditions.

You can now edit the binding properties of a VISA TCPIP resource in MAX.
For example, you can change the hostname or IP address.

MAX can now auto-detect VXI-11 TCPIP resources on your subnet.  When you
right-click on Devices and Interfaces and choose Create New..., you then
need to specify a VXI-11 instrument and click the option to have MAX browse
your local subnet.

If you enabled the VISA COM API for VI_EVENT_SERVICE_REQ for a callback,
it would crash when the event was being raised.  This has been fixed.

If you tried to exit the VISA Interactive Control utility by right-clicking
on the taskbar icon and choosing Close, the utility would hang.  This has
been fixed.

Using remote NI-VISA with asynchronous I/O did not properly transmit data
asynchronously.  This has been fixed.

In Serial on LabVIEW RT, you can now configure advanced settings (such as
FIFO triggers and the default RS-485 wire mode) in MAX.

In Serial, if the Windows configuration settings for a given port were
different from the NI-VISA settings, MAX would overwrite the Windows settings
when you hit Refresh.  Now, MAX points out the different settings and lets
you choose.

In MAX, selecting Rename on an alias and changing merely the case of the
alias would cause an error.  This has been fixed.

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.

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.

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

If a PXI multi-function device did not have function 0 registered as an
NI-VISA resource, then viFindRsrc would not return any of the other functions
of that device either, even if they were registered with NI-VISA.  This now
works properly.

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 3.0.1 IMPROVEMENTS AND BUG FIXES
----------------------------------------
For a PXI INSTR resource, calling viEnableEvent and viDisableEvent in a loop
would leak memory.  On LabVIEW RT, this would eventually cause a reboot.

For a GPIB INTFC resource, performing any asynchronous I/O would
occasionally cause a crash when you later close the VISA session.

Installing NI-VISA 3.0 on a system with LabVIEW 6.1 would cause user VIs
that use "VISA Configure Serial Port" to have a broken wire.


NI-VISA 3.1 IMPROVEMENTS AND BUG FIXES
--------------------------------------
NI-VISA 3.1 supports the PXI/PCI interface type in the RTX real-time
environment in LabVIEW RT.  This is a new feature.

The VISA Driver Development Wizard can install the generated INF file onto
your local system.  This is a new feature.

The BACKPLANE resource type is supported in the PXI resource class.  This is
a new feature.

For a VI running on LabVIEW RT, calling VISA Close on an ENET-Serial resource
would occasionally either hang or return an error.  This has been fixed.

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

In MAX, it was not possible to create static TCPIP resources on a LabVIEW RT
system.  This has been fixed.

On Windows NT, 2000, or XP, calling viEnableEvent on a PXI/PCI INSTR resource
would occasionally cause a system crash.  This has been fixed.

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.

Querying VI_ATTR_ASRL_AVAIL_NUM on a parallel port would return a large
random number.  The correct value for this is always 0.  This has been fixed.

If you created a TCPIP resource in MAX with an alias, it wouldn't show up.
This has been fixed.

In MAX, choosing the Tools>>NI-VISA>>VISA Options menu item would not always
bring up the options.  This has been fixed.

In MAX if you disabled a COM port and hit Refresh, the Serial resource
would disappear completely.  This has been fixed.  The resource now continues
to exist but has a black X overlay icon to indicate that it is disabled.

The VISA Driver Development Wizard now supports the PXI standard module.ini
format.  It will generate that file along with the .INF files for NI-VISA.
You can also use this wizard to load module.ini files from other vendors.

In MAX, if you inserted a new Serial port, it would erroneously claim that
the settings have a conflict.  This has been fixed.

The VI_EVENT_USB_INTR event attributes did not work properly.  This has been
fixed.

If you unplugged a VISA USB device and plugged it back in, NI-VISA could not
access the device properly.  This has been fixed.

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

Creating a new remote NI-VISA system would hang MAX.  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.

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

Calling viGetAttribute on VI_ATTR_INTF_INST_NAME on TCPIP resources with
Internet Explorer 2 would crash.  This has been fixed.

If you enabled a LabVIEW RT system that was using DHCP as a VISA remote
system to search when finding resources, NI-VISA would use the IP address
rather than the DNS name.  Starting with LabVIEW RT 7.1, remote systems are
correctly assigned DNS names, and NI-VISA can use the DNS name when
finding remote resources.  Any existing remote VISA system that was enabled
for finding will remain listed using its IP address unless you disable and
re-enable the system for finding.  Enabling a remote system with LabVIEW RT
7.1 already installed will result in NI-VISA using the DNS name if it is the
same as the name of the remote controller.  Otherwise, if the remote system
is not using DHCP, or if the DNS name does not match the controller name,
then NI-VISA will still use the IP address of the remote system.

In MAX, if you changed the VISA Options and browsed to another item, your
changes would sometimes be lost.  This has been fixed.

The manufacturer and model name for PXI/PCI resources were incorrectly
reported as unknown.  This has been fixed.

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

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


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
------------
Installing this on a system with NI-VISA 2.01 might remove T&M Explorer even
if NI-VXI 2.x is installed.

The VISA COM API is not yet documented.  This release of the VISA COM API
should only be used by IVI driver developers who are familiar with the
specification.  The VISA COM API can only be installed if you have
Internet Explorer 4.01 or higher on your system.