You can use LabVIEW Real-Time (RT) Express VIs, LabVIEW RT Low Level VIs, and LabVIEW FPGA I/O nodes to program the Analog Input channels.
The LabVIEW ELVIS III Toolkit provides examples of using analog input channels to perform signal acquisition. You can find these examples in the labview\examples\ELVIS III\Real-Time Control Applications\Analog IO\Analog IO.lvproj directory.
Use the Express VIs to interactively configure the settings for the I/O channels. When you place an Express VI on the block diagram or double-click an Express VI, a configuration dialog box appears. Use this configuration dialog box to configure the Express VI. Find the Express VIs on the subpalette on the Functions palette, as shown in the following figure:
The LabVIEW ELVIS III Toolkit provides Analog Input Express VI to access the Analog Input channels.
Use the Low Level VIs to have more programmatic access to settings of I/O channels. For example, you can use the Low Level VIs to open or close certain channels and change the channel configuration at run time. Find the Low Level VIs on the Low Level palette, as shown in the following figure:
The LabVIEW ELVIS III Toolkit provides the following Low Level VIs to access the Analog Input channels:
Select or press <Ctrl-H> to display the Context Help window, from where you learn the basic information about each of the Express VIs and Low Level VIs. To learn more details about the VIs, refer to the LabVIEW ELVIS III Toolkit Help by clicking Detailed help at the bottom of the Context Help window, shown as follows:
Use the FPGA I/O nodes from the FPGA palette to access the Analog Input channels on the NI ELVIS III. You can also use the FPGA I/O property nodes if needed. Channels from both banks on the NI ELVIS III can be used in a single FPGA I/O node. The I/O banks are denoted as connectors in the software. The following figure shows a VI that uses FPGA I/O nodes to read inputs from AI channels 0 to 1 on Bank A and Bank B.
The FPGA palette does not provide any devoted FPGA I/O nodes for specific protocols such as PWM and Encoder. To access these protocols, use the LabVIEW RT VIs instead.
Refer to the FPGA I/O Functions section of the LabVIEW FPGA Module Help for detailed information about using the FPGA I/O nodes to perform operations on FPGA targets. Refer to the NI ELVIS III section in the NI Compact RIO Device Drivers Help to learn what terminals and I/O methods and properties you can access for the NI ELVIS III. You can access these help files by selecting in LabVIEW, or search for their online versions on ni.com/manuals.