Method for operating an agricultural machine having a tractor and an implement hitched to the tractor, the method comprising: - connecting a control device provided on the tractor to a data bus, wherein the control device is configured to process data indicative for a plurality of implement operation parameters assigned parameter identifiers P1 to Pn (n ≥ 2); - connecting a control unit provided on the implement to the data bus, wherein the control unit is assigned to at least one functional element of the implement; and - establishing data communication between the control device and the control unit through the data bus, comprising: - in response to connecting the control unit to the data bus, transmitting a response data message from the control unit to the control device, the response data message indicating the control unit being configured to provide present parameter values for only a subset of implement operation parameters assigned parameter identifiers P1 to Pm (m < n), but not for a subset of remaining implement operation parameters assigned parameter identifiers Pm+1 to Pn; and - in response to receiving the response data message in the control device, - limiting future data collecting messages transmitted from the control device to the control unit to requesting present parameter values for the subset of implement operation parameters assigned parameter identifiers P1 to Pm only, and - preventing the future data collecting messages transmitted to the control unit from requesting present parameter values for the subset of the remaining implement operation parameters assigned parameter identifiers Pm+1 to Pn. - connecting a control device provided on the tractor to a data bus, wherein the control device is configured to process data indicative for a plurality of implement operation parameters assigned parameter identifiers P1 to Pn (n ≥ 2); - connecting a control unit provided on the implement to the data bus, wherein the control unit is assigned to at least one functional element of the implement; and - establishing data communication between the control device and the control unit through the data bus, comprising: - in response to connecting the control unit to the data bus, transmitting a response data message from the control unit to the control device, the response data message indicating the control unit being configured to provide present parameter values for only a subset of implement operation parameters assigned parameter identifiers P1 to Pm (m < n), but not for a subset of remaining implement operation parameters assigned parameter identifiers Pm+1 to Pn; and - in response to receiving the response data message in the control device, - limiting future data collecting messages transmitted from the control device to the control unit to requesting present parameter values for the subset of implement operation parameters assigned parameter identifiers P1 to Pm only, and - preventing the future data collecting messages transmitted to the control unit from requesting present parameter values for the subset of the remaining implement operation parameters assigned parameter identifiers Pm+1 to Pn. - in response to connecting the control unit to the data bus, transmitting a response data message from the control unit to the control device, the response data message indicating the control unit being configured to provide present parameter values for only a subset of implement operation parameters assigned parameter identifiers P1 to Pm (m < n), but not for a subset of remaining implement operation parameters assigned parameter identifiers Pm+1 to Pn; and - in response to receiving the response data message in the control device, - limiting future data collecting messages transmitted from the control device to the control unit to requesting present parameter values for the subset of implement operation parameters assigned parameter identifiers P1 to Pm only, and - preventing the future data collecting messages transmitted to the control unit from requesting present parameter values for the subset of the remaining implement operation parameters assigned parameter identifiers Pm+1 to Pn. - limiting future data collecting messages transmitted from the control device to the control unit to requesting present parameter values for the subset of implement operation parameters assigned parameter identifiers P1 to Pm only, and - preventing the future data collecting messages transmitted to the control unit from requesting present parameter values for the subset of the remaining implement operation parameters assigned parameter identifiers Pm+1 to Pn.