Method for operating a coupled unit

A method for operating a coupled unit with a tractor, a swather attached to the tractor as a first processing device, and a round baler attached to the swather as a second processing device, the method comprising:

• using the swather to pick up a crop lying on the ground via processing elements which are arranged on a swather frame;
• using the swather to deposit the picked-up crop in a deposit area so as to form a swath which has a swath center;
• using the round baler to pick up the swath via a pick-up device which extends along a round baler transverse axis;
• using the round baler to further compress the picked-up swath into at least one crop bale;
• and
• performing an automatic pick-up adjustment via a device adjustment on at least one of the swather and on the round baler via an actuator-based device setting, at which automatic pick-up adjustment a relative picking up position taken at the swath center and at the pick-up device relative to one another with respect to the round baler transverse axis is adjusted so as to achieve a uniform build-up of the at least one crop bale along the round baler transverse axis,
• wherein,
• the round baler sends an adjustment signal to the swather,
• the swather performs the device adjustment based on the adjustment signal, and
• the tractor, the swather attached to the tractor as the first processing device, and the round baler attached to the swather as the second processing device are provided as three separate vehicles.