private void button6_Click(object sender, EventArgs e)
 {
     timeup = 0;
     //wait for return signal//
     Myport.setcomstep(true); //reset comstep
     Myport.TxText("XYX" + textBoxTXdata.Text);
     do
     {
         Thread.Sleep(10); if (timeup == 1)
         {
             break;
         }
     } while (Myport.setcomstep() != '6');
     textBoxRXtopic.Text = Myport.getRx();
     Myport.TxText("XWX" + textBoxTXdata.Text);
     do
     {
         Thread.Sleep(10); if (timeup == 1)
         {
             break;
         }
     } while (Myport.setcomstep() != '5');
     textBoxRXdata.Text = Myport.getRx();
     //buttonRefresh.Text = "Refresh OK";
     aTimer.Enabled = false; //disable timer
 }