NISTC_DIO_IN_REG
data[1] = ni_stc_readw(dev, NISTC_DIO_IN_REG);
if (ni_stc_readw(dev, NISTC_DIO_IN_REG) & NISTC_DIO_SDIN)
[NISTC_DIO_IN_REG] = { 0, 0 }, /* Unknown */