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();
}