Block Diagram of Servo Gimbal

Hi, I want to know the control block diagram of servo gimbal, can anyone tell me? Thank you!

what are you trying to do ?

And if you are using a gimbal you should not be using arducopter 4.0.x.
Update to arducopter 4.4.0 and change the header of this post from 4.0 to 4.4

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I am curious about the control principle.