Randy,
The newer units, e.g. Prosine 2 don't have a reset switch that I'm aware of but the older units did. If I remember correctly it was on one end of the unit. Check your Xantrex manual. If your coach has a house battery disconnect switch, usually located in the battery bay, use it to remove power from the inverter. Otherwise you can disconnect the positive feed line at the battery for 10-20 seconds. Have all lights and a other 12v loads off when doing this to reduce the chance of arcing.
Steve