I use one similar to this :- http://www.ebay.co.uk/itm/22-in-1-Flight-Simulator-Cable-USB-For-RC-Realflight-G7-G6-G5-5-G5-Phoenix-5-0-/171987124919?hash=item280b3b42b7:g:wosAAOSwezVWwT49
Works a treat in the aerofly switch position.
Can't get it to work in Liftoff though....