The present disclosure relates to a control system for controlling a medical system. The control system comprising: a portable device, a transmitter placed in a location of a local use environment of the portable device, and a data handling system comprising a detection module, a data interface, and a device controller functionally connected to the detection module and the data interface. The data handling system is configured to detect local vicinity of the portable device to the at least one transmitter by the detection module, receive input data from the at least one transmitter via the data interface, generate device control data for a medical device, comprising processing of the input data, and transmitting the device control data to a control device. Furthermore, a portable device, a method for controlling a medical system, and a computer program product for controlling a medical system by a control system are disclosed.