Read Me First, July 2006

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Using NI-VISA 4.0

Supported Platforms

NI-VISA for Windows supports the following platforms:

Windows (Win32) XP x64
Windows (Win32) XP/2000
LabVIEW Real-Time (Phar Lap ETS) 8.2/8.0/7.1.1
LabWindows/CVI Real-Time (Phar Lap ETS) 8.0.1
LabVIEW Real-Time (RTX) 8.2/8.0
LabVIEW PDA Module (Windows Mobile/CE) 8.2/8.0
LabVIEW Touch Panel Module (Windows CE) 8.2

While this distribution targets all these platforms, you can run setup.exe only on Windows XP/XP x64 and Windows 2000.

Installing and Uninstalling NI-VISA 4.0

NI-VISA 4.0 does not support Windows 9x/NT. To run your VISA application on Windows 95, you must install NI-VISA 2.6.1 or lower. To run your VISA application on Windows 98/Me, you must install NI-VISA 3.0.1 or lower. To run your VISA application on Windows NT, you must install NI-VISA 3.3.1 or lower.

Before you install NI-VISA 4.0, we strongly recommend that you uninstall any versions of VISA prior to NI-VISA 2.0.1. NI-VISA 4.0 should upgrade properly over NI-VISA versions 2.0.1 through 3.6.

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 reinstall 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.

PXI Support

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_CHASSIS1 && VI_ATTR_SLOT3}' 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::<busNum>-<devNum>[.<funcNum>]::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<busNum>::<devNum>[::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

To enable geographic addressing, a PXI system description file (pxisys.ini) must be present on the system. Beginning with NI-VISA 3.0, Measurement & 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:

Launch MAX.
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.
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 such as MXI-3, select this option from the menu.
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. The 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 allows drivers (including NI-VISA) and other configuration software to enable geographic addressing and other features of PXI. On Windows, this file is in the Windows directory. For LabVIEW RT systems, the pxisys.ini file is automatically copied to the remote system's c:ni-rtsystem directory.

Multiple GPIB-VXI Controller Support

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 MAX 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 MAX from the Tools»NI-VISA»VISA Options menu.

Agilent/HP Controller Support

NI-VISA now works with Agilent/HP GPIB and VXI controller cards. To use this feature, go

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