Настройка порта USB (FLOW CONTROL)

DCB SetDCB;
GetCommState(ConDevice, &SetDCB);
SetDCB.DCBlength = sizeof(SetDCB);
SetDCB.BaudRate = System::Convert::ToInt64(BaudRateCB->SelectedItem);
SetDCB.fBinary = TRUE;
SetDCB.fOutxCtsFlow = FALSE;
SetDCB.fOutxDsrFlow = FALSE;
if (FlowControlCB->SelectedIndex == 1) {
    SetDCB.fDtrControl = DTR_CONTROL_HANDSHAKE;
}
if (FlowControlCB->SelectedIndex == 0) {
    SetDCB.fDtrControl = DTR_CONTROL_DISABLE;
}
SetDCB.fDsrSensitivity = FALSE;
SetDCB.fNull = FALSE;
SetDCB.fRtsControl = 0x01;
SetDCB.fAbortOnError = FALSE;
SetDCB.ByteSize = System::Convert::ToInt64(DataBitsCB->SelectedItem);
SetDCB.Parity = ParityCB->SelectedIndex;
SetDCB.StopBits = ONESTOPBIT;
SetCommState(ConDevice, &SetDCB);