public frmMain()
		{
			InitializeComponent();
			string[] ports = System.IO.Ports.SerialPort.GetPortNames();
			cmbPort.Items.AddRange(ports);
			cmbPort.SelectedIndex = 0;
			mPlot = new frmPlot();
		}
		private void btnPlot_Click(object sender, EventArgs e)
		{
			mPlot.Close();
			mPlot = new frmPlot();
			if (mPlot.plot(dataArr))
				mPlot.Show();
		}