User Manual
146 
the robotic arm moves in the direction of α angle. If the robotic 
arm needs to be moved in the direction of the β angle, a new 
position between the angles of β should be inserted, and the angle 
that formed by the inserted point and A should be smaller than α.  
● The +180° and -180°points of the Roll/Pitch/Yaw are coinciding 
in the space, and the valid range is ±180°, so it is possible to 
have both ±180° when the robotic arm is reporting the position. 
● Roll angle, pitch angle, and yaw angle (RPY). The RPY rotation 
matrix (X, Y', Z" rotation) is determined by the following formula: 
R rpy (γ, β, α) = R Z (α) · R Y (β) · R X (γ) 










