Sensor (10, 30) for an automatic door monitoring a detection area comprising a first detection unit (12, 34 a,b,c,d) and a second detection unit (14, 36 a,b,c,d) for detecting an object within the detection area, an internal control unit (24, 44a), to which the first detection unit (12, 34 a,b,c,d) and the second detection unit (14, 36 a,b,c,d) are connected, the sensor furthermore comprises a first output port (18, 38 a,b,c,d) dedicated to output the signal related to the first detection unit (12, 34 a,b,c,d) that is connected to the internal control unit (24, 44a), and a second output port (20, 39 a,c,d) dedicated to output the signal related to the second detection unit (14, 36 a,b,c,d) that is connected to the internal control unit (24, 44a), the sensor furthermore comprises a configuration means (22, 32 a,b,c,d) which allows configuration of at least two alternative transmission modes, where according to a first transmission mode a first output mode is set, where a signal based on the source signal provided by the first detection unit (12, 34 a,b,c,d) is output on the first output port (18, 38 a,b,c,d) and / or a signal based on the source signal provided by the second detection unit (14, 36 a,b,c,d), is output on the second output port (20, 39 a,c,d), and in a second transmission mode a second output mode is set, where a combined output signal, which is created based on - the source signal provided by the first detection unit (12, 34 a,b,c,d) and - the source signal provided by the second detection unit (14, 36 a,b,c,d), is output on the first output port (18, 38 a,b,c,d) and / or the second output port (20, 39 a,c,d) the sensor furthermore comprises an input port (16, 40 a,b) that is connected to the internal control unit, and where the configuration means (22, 32 a,b,c,d) is adapted to select a transmission mode where an output signal is created in dependency of the input signal received via the input port (16, 40 a,b) and fed to the first output port (18, 38 a,b,c,d) and / or the second output port (20, 39 a,c,d), characterized in that the first output port (18, 38 a,b,c,d) or the second output port (20, 39 a,c,d) is connectable to an input port of an identical sensor (10, 30) via a physical line. a first detection unit (12, 34 a,b,c,d) and a second detection unit (14, 36 a,b,c,d) for detecting an object within the detection area, an internal control unit (24, 44a), to which the first detection unit (12, 34 a,b,c,d) and the second detection unit (14, 36 a,b,c,d) are connected, the sensor furthermore comprises a first output port (18, 38 a,b,c,d) dedicated to output the signal related to the first detection unit (12, 34 a,b,c,d) that is connected to the internal control unit (24, 44a), and a second output port (20, 39 a,c,d) dedicated to output the signal related to the second detection unit (14, 36 a,b,c,d) that is connected to the internal control unit (24, 44a), the sensor furthermore comprises a configuration means (22, 32 a,b,c,d) which allows configuration of at least two alternative transmission modes, where according to a first transmission mode a first output mode is set, where a signal based on the source signal provided by the first detection unit (12, 34 a,b,c,d) is output on the first output port (18, 38 a,b,c,d) and / or a signal based on the source signal provided by the second detection unit (14, 36 a,b,c,d), is output on the second output port (20, 39 a,c,d), and in a second transmission mode a second output mode is set, where a combined output signal, which is created based on - the source signal provided by the first detection unit (12, 34 a,b,c,d) and - the source signal provided by the second detection unit (14, 36 a,b,c,d), - the source signal provided by the first detection unit (12, 34 a,b,c,d) and - the source signal provided by the second detection unit (14, 36 a,b,c,d), is output on the first output port (18, 38 a,b,c,d) and / or the second output port (20, 39 a,c,d) the sensor furthermore comprises an input port (16, 40 a,b) that is connected to the internal control unit, and where the configuration means (22, 32 a,b,c,d) is adapted to select a transmission mode where an output signal is created in dependency of the input signal received via the input port (16, 40 a,b) and fed to the first output port (18, 38 a,b,c,d) and / or the second output port (20, 39 a,c,d), characterized in that the first output port (18, 38 a,b,c,d) or the second output port (20, 39 a,c,d) is connectable to an input port of an identical sensor (10, 30) via a physical line.