Thanks Michael & Support, I will try these setting although having just played around with various settings I now have "Flarm OK" showing on the Map screen, and the TX/RX on the serial port data screen are counting up and good sentences are counting as well. Am I correct in assuming that the Dynon is talking to the Flarm correctly.
I have been flying once, but no targets were displayed. There were other aircraft around within the detection limits. I am not sure they would have had Flarm, but they would have had transponders.
Does anything display on the PFD screen about traffic information if no traffic is detected?