FTDI_SIO_SET_RTS_HIGH
FTDI_SIO_SET_RTS_HIGH : FTDI_SIO_SET_RTS_LOW;
uf->uf_mctl &= ~FTDI_SIO_SET_RTS_HIGH;
uf->uf_mctl |= mctl & FTDI_SIO_SET_RTS_HIGH;
if ((uf->uf_mctl & FTDI_SIO_SET_RTS_HIGH) == FTDI_SIO_SET_RTS_HIGH)