Bioreactor, end plate for bioreactor and data transmission unit for end plate

The invention relates to a bioreactor (1), comprising a container (13), an end plate (11), an agitator, a drive unit (15), at least one field device (50, 50a, 50b) arranged in an interior (14), said field device having field device electronics and a data transmission unit arranged on the end plate (11), said data transmission unit having a motor head (40), the invention relates to a motor head (40) which can be connected to an evaluation unit in a signaling manner and to a drive unit (15) in an energy manner, and which comprises motor head electronics, and at least one communication unit which is connected to the motor head (40) in a signaling manner, comprising: an adapter (20, 20a, 20b) having adapter electronics which are electrically connected to field device electronics of a field device (50, 50a, 50b), the adaptive electronic device and/or the communication electronic device comprises a signal converter; and a communication unit (20, 20a, 20b) having communication electronics, the communication electron