SDI-12 to cRIO-9040

Hi there,

I'm looking to log data from a weatherstation with a cRIO-9040. An NI tutorial recommends using a RS-232 to SDI-12 converter (http://www.ni.com/tutorial/7706/en/). However they seem difficult to get hold of in the UK. 

A USB to SDI-12 converter is easier to source, is this still supported by the LabVIEW SDI-12 API? If not can anyone recommend viable alternatives? 

Kind regards.

Oliver