After the gimbal is powered on, the Focus Wheel’s indicator will blink red once, indicating that Focus Wheel is not connected. If the Focus Wheel’s indicator is solid yellow, it means that the external Focus motor is detected, but the calibration is not done. If the Focus Wheel’s indicator is solid green, the camera supporting E-Focus Control is connected, or the external Focus motor is connected, and the calibration was done. If the Focus Wheel’s indicator blinks green twice, the motor’s A and B points have been set.