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Webasto Diagnostic Adaptor Coms Failure.

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Calling all you computer experts with experience of W.T.T. Adaptor https://www.ebay.co.uk/itm/402121622145.


Boat has Webasto Thermo Top C (Not W-Bus) with temperature control via Honeywell Room Thermostat and Motorised Valve. 


Purchased W.T.T. Adaptor and software to enable Windows 10 Laptop to monitor Thermo Top C but unfortunately unable to open communications with W.T.T. Adaptor 


Windows10 Laptop W.T.T.version 2.16.1 (latest available) and  selected appropriate model from Menu.


Have loaded latest W.T.T. Drivers.


Device Manager Com Port same as in W.T.T in Extras but any attempts to Start Diagnosis results in 'selected com port can not be used' message irrespective of selected port; automatic port selection results in endless repeat of same message and having to power down laptop to terminate.


Have been playing email tennis with supplier without success.


Grateful for any help or guidance.





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