Problema comunicazione seriale linux - arduino

Mi sa che usa il dtr

da Arduino-usbserial.c

void EVENT_CDC_Device_ControLineStateChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
{
	bool CurrentDTRState = (CDCInterfaceInfo->State.ControlLineStates.HostToDevice & CDC_CONTROL_LINE_OUT_DTR);

	if (CurrentDTRState)
	  AVR_RESET_LINE_PORT &= ~AVR_RESET_LINE_MASK;
	else
	  AVR_RESET_LINE_PORT |= AVR_RESET_LINE_MASK;
}