I think you might have to play around, a little, and see if this works.
Go into the Tuner Configuration menu.
Select the Advanced option.
Select LNB 1 for the motorized dish and manually set up a few satellites, using Diseqc 1.2. then test it to see if your motor works, if not try altering some of the settings, like uncommitted Diseqc commands.
If you get your motorized dish working, with the Diseqc switch, then try setting up the fixed dish, by going into the tuner, selecting LNB 2, and setting this up on Diseqc 1.