Make sure that you have created the RTDX channel in your CCS code with the following command:
RTDX_CreateInputChannel(channelname);
You then need to make sure that the datatypes match up when you call the command to read.
RTDX_read(...);
Are you able to run the example programs that shipped with the toolkit? You should find them installed at
"C:\Program Files\National Instruments\LabVIEW 7.0\examples\DSPTest". If you have the 6701EVM, you should find an example especially for it.
If you continue to see the error, please post a reply.
Regards,
Kristi H
National Instruments