Pixhawk storm32 gimbal

Good day,
i bought a 3axis gimbal with Storm 32 board, after i connected it on frsky x8r channel and configured it on mp gimbal remain in the same position.
I noticed that after powered the red and green led blink after this the green led remain off.
Any advice for solve this issue??
My fc pixhawk is connected from the rcin pins to the sbus of x8r.