Alwarerc Senrigan GP-55 3-Axis Brushless Gimbal V2 With Bluetooth (For 600 -1000 Size Multicopter) - Manual (Page 14)

Connect Motors to the Controller. Secure the Top Mounting Frame using
4pcs M3x6mm Hex Cap Screws.
The Pan(+-360 degree) and Tilt(+45-90
degree) axis of GP-55 can be controlled
by using any two Free channels of your
receiver. Also by assigning a 2-way/ 3-
way switch channel to “FC ROLL” Port
of the controller can control the Gimbal
operation modes (Lock Mode or Follow
Pan Mode)
14