The present invention is directed to a method for bidirectional communication between a command unit and a plurality of LED control units connected thereto. In accordance with the invention, it is possible to supply control commands to LED control units with high speed, or to return execution results from these control units to a command unit. Therefore, the present invention provides for a highly efficient and thus highly performant method for communication between several serially connected control units. Furthermore, the invention is directed to a respective device for bidirectional communication as well as a computer program product including control commands for implementation of the method.