Using Fetch3600 with a WS3502?

Does anyone know if it’s possible to use fetch 3600 with a WS3502?
I have tried setting it up as if I was using a 3600, and it seems to get some data - ie the out3600 text file updates and seems to contain all the relevant data from the console, but the wind display in WD never updates. It remains on whatever value was shown from Heavy Weather before closing that and starting Fetch.
I have tiked the “use fetch instead” box, and the get data evry 30secs box. The com port is set to the same port that HW uses. The data logger master switch is turned on - can’t think of anything ele to try.

Thanks for any help