Thanks for the response and suggestion.
However my Model C-225 has 5 wires for connecting to the controller.
I also understand the the C-255 controller allows moving the antenna to any position ,compared to the U-100 which move the in 9 (?) degree steps.
As a result I don't believe the U-100 controller will work on my C-225.
If anyone knows how to make them work together , please advise.
The U-100 controller absolutely will not work with the C-225.