Baler system and a method of operating the baler system

A method of operating a combination of a tractor and a baler connected to the tractor, wherein the tractor includes a drive motor connected to a drive shaft of the baler, and a tractor controller operable to control a driving speed of the tractor and a rotational speed of the drive shaft of the baler, wherein the baler includes a pick-up for picking up crop, a baling chamber in which the picked-up crop is compressed to form a bale, a bale sensor with which the size of a bale in the baling chamber is sensed, and a baler controller connected to the bale sensor and to the tractor controller, the method comprising:

• sensing a diametric size of the bale in the baling chamber with the bale sensor and sending a bale signal to the baler controller indicative thereof;
• sending a stop signal from the baler controller to the tractor controller when the bale signal of the bale sensor indicates that the size of the bale is greater than a first predetermined size;
• and
• initiating a braking operation with the tractor controller for stopping the tractor and adapting a driving rotational speed of the drive shaft of the baler when the tractor controller receives the stop signal from the baler controller.