Abstract: Method of and communication system for controlling operation of at least one transmitter and/or one receiver in a communication system, e.g. a system for transmission of control signals, request signals, interrogation signals etc. wherein a signal comprising a message frame transmitted from a transmitter to a receiver comprises a message part indicative of the time of transmission for a later signal.

Abstract: Method of and system for transmitting signals, e.g. control signals, request signals, interrogation signals etc. in a control system comprising at least two units, wherein at least one of said units is designed to operate as a master unit and wherein at least one of said units is designed to operate as a slave unit, whereby a plurality of channels may be used for the transmission, whereby a first unit performs the steps of detecting a vacant channel and transmitting a signal via said vacant channel, and whereby at least one other unit performs the step of scanning the channels for transmitted signals.

Abstract: Method of and system for transmitting signals, e.g. control signals, request signals, interrogation signals etc. to a node in the form of a controllable unit associated with a device, e.f. a controllable device, measuring means, etc. and wherein said controllable unit may be linked to at least one further node by means of a communication bus, at least one of said nodes comprising radio frequency receiving means, said method comprising the steps of a) transmitting a signal from a controller, b) reception of said signal by at least said node comprising radio frequency receiving means, c) detection of at least part of said signal indicating a destination node, and d) retransmittal of said signal or part of said signal by said nore comprising radio frequency receiving means to said destination node via said communication bus.