M_DUART_IN_PIN2_VAL
(!(status & M_DUART_IN_PIN2_VAL) ? TIOCM_DSR : 0);
if (delta & (M_DUART_IN_PIN2_VAL << S_DUART_IN_PIN_CHNG))
if (delta & ((M_DUART_IN_PIN2_VAL | M_DUART_IN_PIN0_VAL) <<