@asoler My concern is that this digitizer code has been working for a long time for Fastrak devices. If you need this extra line in your specific case, it probably means that you are using a different type of hardware than what was used to write this function.
Maybe we need to add an extra test before sending this F character, maybe checking the version of the hardware? or control this with a checkbox in the GUI?
Could someone with a Polhemus Fastrak device check this?