Connectivity Interfaces for Instrument Control
When getting started, NI recommends using an instrument driver. Instrument drivers save you development time and cost because you do not need to learn the programming protocol for each instrument. The two types of instrument drivers are described further in this document.
1. Use Plug and Play Instrument Driver
A LabWindows/CVI Plug and Play instrument driver is a set of ANSI C software routines exported from a DLL. You can call these instrument drivers from any development environment that supports calls into DLLs.
2. Use IVI Instrument Driver
IVI drivers are DLL-based drivers developed in LabWindows/CVI that allow for simulation and instrument interchangeability. To achieve interchangeability, the IVI Foundation defines specifications for the following instrument classes: DMM, oscilloscope, arbitrary waveform/function generator, DC power supply, switch, power meter, spectrum analyzer, and RF signal generator. IVI drivers also provide additional benefits like instrument state caching for improved performance, multithread safety, and instrument attribute access.
3. Modify Existing Instrument Driver
If an instrument driver doesn’t exist for your instrument but a similar driver exists, you can modify the existing driver to fit your application needs.
4. Create Instrument Driver
If an instrument driver doesn’t exist for your instrument and there aren’t any similar drivers, you can create an instrument driver from the Instrument Driver Project Wizard.
5. Use NI-VISA API
NI-VISA is the NI standard I/O API for instrumentation programming. NI-VISA can control GPIB, serial, USB, Ethernet, PXI, or VXI instruments, making the appropriate driver calls based on the instrument type so you do not have to learn instrument-specific communication protocol.
6. Use NI-488.2 API
Use NI-4882 to develop and debug an application program for GPIB instruments. The NI-488.2 driver has high-level commands that automatically handle all bus management. Low-level commands are also available. LabWindows/CVI examples installed with the driver can be found in NI Example Finder.
7. Use NI Device Driver
For NI modular instruments, use the device drivers provided by NI found in NI Driver Downloads. LabWindows/CVI examples installed with the driver can be found in NI Example Finder.
8. Submit Instrument Driver Request
If the Instrument Driver Network does not have the driver you need, you can submit an instrument driver request. These requests are monitored by the NI Instrument Driver group and are developed based on popular demand.