No data from Davis VP at data history extraction at start up

if you have inserted the data logger with power on the console, you will need to reset data logger:
power down the console completly
then remove the data logger and cable to the pc
then wait 1 minute
then put back in, re power up the console, do the done - key pad thing
then check the time and date is ok
then set the data logger to 1 minute loggin either with wlink of WD (i.e click on abort in wd with that data logging window open)
then wait for data to accumulate in wd before retesting