Neither DAQmx nor DAQmx Base support Linux RT kernels, but I have seen reports of success from hardware owners using Comedi with RTAI on their mailing list.
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Principal Software Engineer :: Modular Instruments Application Software
Senior Software Engineer :: Multifunction Instruments Applications Group (until May 2016)
Software Engineer :: Measurements RLP Group (until Mar 2014)
Applications Engineer :: High Speed Product Group (until Sep 2008)