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USB8451, c++, SPI command of 14 bits

Im trying  to communicate with USB8451 to a DAC (MAX5105/06). Can´t read and write with

command ni845xSpiWriteRead. I don´t reply any error code.

The command length of the DAC is 14 bits. Will it work even though  USB8451 always sends multiples of 16 bits?

Ihave looked  at example in C:\Program Files\National Instruments\NI-845x\MS Visual C\Examples.
 
/Irene
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