Alex - On my Trac Vision L3, the controller is built into the antenna mounting assembly. However, it requires a compatible receiver to direct antenna position. A serial interface using an RJ 45 or 9 pin serial type connector on the receiver communicates with the antenna controller. Without a compatible interface on the receiver, you will have to get software to manually control the antenna through the serial port of a computer or some special device. The receiver type depends on whether you have Dish or Direct TV.
'01 Alpine 36 FDDS