Paul, I overlooked your remark your windmeter has ID=4. To select this one you have to set -tr 16 (ID 0=1, ID 1=2, ID 2=4, ID 3=8, ID 4=16, ID 5=32, ID 6=64, ID 7=128) Add the numbers of all transmitters to select. In your case to select both transmitters use -tr 17
Note: the weewx-rtldavis driver will preset -tr based upon data in the Rtldavis config section in weewx.conf. Luc
