I am currently designing a data acquisition system to run tests at my work using a cDAQ-9174 chassis, and we have a programmable variable power supply that we would like to control and measure data from in LabVIEW. There was not a driver for this specific power supply on the NI website, so I followed the tutorial http://www.ni.com/tutorial/4478/en/#toc2 for configuring and installing a driver. However, I am unable to create a block diagram that runs properly because I run into "Timeout expired before operation completed" or "Invalid buffer mask specified" errors. At first DAQmx was able to validate the port settings, but even after making no changes it seems to randomly get an error "The resource is valid, but VISA cannot currently access it." Has anyone used a similar setup with greater success? I do not know much about USB protocol and the two times I have restarted the process, NI-VISA named it first as a RAW resource, and then as a INSTR resource, which to my understanding use completely different configuration settings in the block diagram. If it helps, I am using LabVIEW 2011.
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