Svein,
Can you post a link / name / photo of your USB to Serial RS232 lead please.
The way this works is that the USB end plugs into the spare port on PilotAware (normally top left,
which is PORT 1 - important as this port has to be configured to 'FLARM In' on the PilotAware (PAW) Configure Screen.
You then need an RJ12 6-pole 6-core data lead which plugs into the splitter supplied with the FlarmMouse. This splitter is normally used to connect the FlarmMouse Power Lead and feed FLARM data from the FlarmMouse to an external FLARM display, but we are going to divert this data into PilotAware instead. You then need to connect the
ground of the RJ12 cable to the ground of the RS232 lead and the Data
OUT of the RJ12 cable to the Data
IN of the serial end of the RS232 to USB lead - which is why I want to check which lead you have, though the Data IN of the serial cable is normally Pin 2 and the Ground normally Pin 5 - see attachment. The pinouts for the FlarmMouse lead are clearly shown in Section 5.2 of the FlarmMouse Manual, which comes with the unit, but can also be downloaded from...
http://lxnav.com/downloads/manuals/FlarmMouseManualEnglishVer0101.pdf (also available in German or French)
Regards
Peter