Help file for serenum
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* Connect the serial PnP device to one of the COM ports say COM1.
* Goto the property sheet of COM1 and change polling to manual.
* Then run serenum.exe. Click on GetID in the File menu.
* The scope should show various hardware signals while the PnP ID
  of the device should also be dumped on the screen.
* It also creates a log file serenum.log which contains the PnP ID