function TComPort.WritePort(Const Buffer; Count: Integer): Integer;
var
 Task: ITask;
 I: Integer;
 Stopwatch: TStopwatch;
 Success: Boolean;
 BytesWritten: DWORD;
 WriteBuffer: TMyByteArray;
 Overlapped: TOverlapped;
begin

 SetLength(WriteBuffer, Count);
 MoveMemory(@WriteBuffer[0], @Buffer, Length(WriteBuffer));

 Task := TTASK.Create(

   procedure
   begin
    PurgeComm(PHandle, PURGE_TXABORT or PURGE_RXABORT or PURGE_TXCLEAR or
   PURGE_RXCLEAR);
 FillChar(Overlapped, SizeOf(Overlapped), 0);
 Overlapped.hEvent := CreateEvent(nil, False, False, nil);

 Success := WriteFile(PHandle, WriteBuffer[0], Count, BytesWritten,
   @Overlapped) or (GetLastError = ERROR_IO_PENDING);

 WaitForSingleObject(Overlapped.hEvent, 4000);
 if Overlapped.hEvent <> 0 then
   CloseHandle(Overlapped.hEvent);




   end

   );
 Task.Start();

 Stopwatch := TStopwatch.StartNew;
 try
   I := 0;
   while I < 10 do
   begin
     I := Ceil(Stopwatch.Elapsed.TotalSeconds);
     IF Task.STATUS = TTASKSTATUS.COMPLETED THEN Break;

     IF Task.STATUS = TTASKSTATUS.EXCEPTION THEN exit(-1);

     Application.ProcessMessages;
   end;


   if not Success then
     exit(-1);

   Result := BytesWritten;
 finally
   Stopwatch.Stop;
 end;
end;