Now, you need to post the COMPLETE Xantrex Model number of your Inverter/Charger. IF JUST A XANTREX 2012, This RC7-GS will not function for a Genstart. The Model 2012 GS Inverter/Charger does have the Genstart capability.
Please post Year and Model of RV. Doug
Since you state you HAVE Genset wiring connections, then it must be a 2012 GS.