Model 2601B-PULSE System SourceMeter Instrument Reference Manual Section 2: Installation
2601B-PULSE-901-01A April 2020 2-37
VXIPnP drivers
VXIplug&play (VXIPnP) style drivers are Win32 DLLs that have some standard functions defined by
the IVI Foundation (ivifoundation.org), such as:
• init
• close
• error_message
• reset
• self_test
• read
• initiate
• fetch
• abort
The application programming interface (API) was defined so that users of instruments would have a
familiar API from instrument to instrument. There are some basic guidelines when creating APIs for
your instrument, such as using VISA data types and how to construct the CVI hierarchy.
LabVIEW drivers
Native LabVIEW drivers
A native LabVIEW
TM
driver is a LabVIEW driver that is created using entirely built-in LabVIEW VIs. It
does not make any calls to external DLLs or Library files. This makes the driver portable to all the
platforms and operating systems that LabVIEW and VISA supports (such as Linux
®
on x86, Mac OS
®
X, and Microsoft
®
Windows
®
).
National Instruments (NI
TM
) maintains a native LabVIEW driver style guide
(zone.ni.com/devzone/cda/tut/p/id/3271).
LabVIEW driver wrappers
All IVI-C drivers have a function panel file (.fp) that shows a hierarchy of the function calls into a DLL.
It is a tool that guides a user to select the correct function call in the driver, since a DLL only has a flat
API entry point scheme (unlike COM or .NET). Any CVI-generated .fp file can be imported into
LabVIEW and LabVIEW will generate a wrapper for the DLL. The drawback here is that the driver is
dependent on the DLL, which is not portable and is therefore specific to the Windows
operating system.
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