Two-wire bus-system comprising a clock wire and a data wire for interconnecting a number of stations

Abstract From the Canadian patent

A communication system comprises a number of stations which are interconnected by means of a clock bus wire and a data bus wire which both form a wired logic function of the signals generated thereon by the stations. During the clock pulses the signal on the data bus wire is stationary; it may change between the clock pulses. Start and stop conditions are formed by a signal combination between clock bus wire and data bus wire which is not permissible in a data stream. If there is more than one master station so that a composite clock signal occurs on the clock bus wire the clocks of the, relevant master stations are each time resynchronized to the actual transitions in the composite clock …