Meithod and apparatus for transmission of command combinations by means of coded frequency-shift keying

The method involves assigning a frequency pair to the command or command combinations. One of the frequencies of the frequency pair of the subsequent command or command combinations is selected dependent on another assigned frequency, during a command transmission from a preceding command or command combinations to a subsequent command or command combinations. The frequency of the command or command combination lies in a limited frequency band, which has a width of four kilohertz. Independent claims are also included for the following: (1) a device for transmission of command or command combinations via a communication connection (2) a computer program product comprising a computer program code units for controlling one or several processors of a device.