Controlling the hardware with Ethernet

[Hooovahh]

I've used a few programmable loads, the last one was a Chroma with a USB or Ethernet interface.  For either you used the same VISA calls for reading and writing data.  The only thing that changed was the open to determine if it was using LXI communication over ethernet, or serial communication over a COM port.  The manual on the USB commands will likely be the same commands used for ethernet communication if you can get it working.  Oh I've also seen a few cases where the TCP VIs are used for reading and writing instead of the VISA ones.  In this case you use the TCP open with the IP address of your hardware, and the appropriate port which in my case was 2101.  I've also seen 9221 or 5025 used on Ametek power supplies.

As for other general LabVIEW help here is some training links.  Check out the 6 hour introduction, or the self-paced training if you have an active SSP (1 year of SSP is included in the price of several LabVIEW versions)

NI Learning Center

NI Getting Started

-Hardware Basics

-MyRIO Project Essentials Guide (lots of good simple circuits with links to youtube demonstrations)

-LabVEW Basics

-DAQ Application Tutorials

-cRIO Developer's Guide 

Learn NI Training Resource Videos

6 Hour LabVIEW Introduction
Self Paced training for students
Self Paced training beginner to advanced, SSP Required