Do you not need to send data to your device to get a response?

Try something like this:
Qt Code:
  1. QString cmd("a command for your device");
  2. deneme->write(cmd.toAscii(), cmd.length());
  3. deneme->waitForReadyRead();
  4. qDebug() << "Bytes availible:" << deneme->bytesAvailible() << "data:" << deneme->readAll();
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