In Devexpress when you are plotting you need to provide 2 values per SeriesPoint
your code should look like this :
assuming ChartControl1
is your control and se is your series name from chart
private void chartTimer_Tick(object sender, EventArgs e)
{
ChartControl1.Series["SeriesNameHere"].Points.Add(new SeriesPoint("AnyOtherValueHere",wf.BitsPerSecond * 0.000001)) ;
}
Replace AnyOtherValueHere
with any thing you like to see in the SwiftChart, this way your chart will view 2 values on 2 axis each time you tick event is triggerd