Hello Mouli,
You always need software that makes the link between FSX and the PoKeys cards. If you are going to use ProSim737 in combination with FSX than you could use PoKeys USB or Pokeys Ethernet cards. ProSim works with both cards and supports encoders, rotaries, switches, 7-segment, leds ...
If you are going to use FSX, and than I mean without ProSim, than I would suggest looking at FSSymphony as intermediate software between FSX and PoKeys cards. FSSympony is great and free to use, but only works with PoKeys ethernet cards (PoKeys 57E). With FSSymphony you could also use encoders, rotaries, switches, 7-segment, leds...
FSSympony is available http://www.flying-the-winglets.de/Re...tml#FSSymphony
Regards, Wendy