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Method and device for performing a bus request and collective acknowledgement in a process bus system

  • US 4,628,503 A
  • Filed: 02/09/1984
  • Issued: 12/09/1986
  • Est. Priority Date: 02/09/1983
  • Status: Expired due to Term
First Claim
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1. Method for performing a bus request or collective acknowledgement on a bus system, in a process bus system for serial data transmission, including subscribers of the process bus system, and a bus control device, which comprises generating a band-limited signal capable of superimposition at all of the subscribers in accordance with a common given principle, transmitting the band limited signal by the subscribers for performing a bus request or collective acknowledgement, and analyzing the signal with the bus control device, the method which further comprises forming the signal which is capable of superimposition in the form of an identical digital pseudo noise signal at all of the subscribers, by:

  • phase modulating a pulse sequence of square-wave oscillations by means of a digital signal formed of a pseuodostochastic binary sequence;

    selecting a number of pulses per period of the binary sequence which is substantially twice as high as the maximum number of subscribers connectible to the process bus system;

    selecting the frequency of the square-wave oscillations in such a manner that the maximum of the power density spectrum of the pulse sequence substantially corresponds to the band center frequency fM of a predetermined frequency band having a band width B; and

    selecting a number k of the square-wave oscillations per pulse of the binary sequence in such a manner that 1/k substantially correspond to a relative band width B/fM.

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