Excavating
Patent
1983-04-18
1985-07-09
Atkinson, Charles E.
Excavating
340310R, G08C 2500, G06F 1100
Patent
active
045286671
ABSTRACT:
A house system for the transmission of information messages which are encoded in the form of digital signals wherein a code is selected which facilitates the testing of each information bit, including a central station and a series of substations at which the information messages of the central station are selectively deliverable through the electrical power supply wiring as the transmission path which is utilized by further similar systems. Each substation, due to an erroneously recognized information bit, will terminate the further information evaluation, whereby each of the information messages evidences a selectable subsequence of digital signals which represents a house code which is specific with respect to the applicable house system, which preferably occurs near the beginning of the total sequence of digital signals representing the information message. The central station generates an operating signal when it is transmitting information messages which is received by a monitoring unit. When an information message originating in a neighboring system with the same house code enters into the house system, then the monitoring unit emits a signal, which, due to the lack of the operating signal of its own central station, recognizes this immediately as a foreign (i.e. nonhouse) information message and emits a signal on the transmission path which causes a code alteration in the incomming information message. The substation which is addressed during the sequence receives this information message containing the code alteration, and consequenty terminates further information evaluation.
REFERENCES:
patent: 3624603 (1971-11-01), Delcomyn
patent: 3652988 (1972-03-01), Yamamoto et al.
patent: 3689886 (1972-09-01), Durkee
patent: 3978449 (1976-08-01), Sanders et al.
patent: 4156866 (1979-05-01), Miller
patent: 4386436 (1983-05-01), Kocher et al.
patent: 4429299 (1984-01-01), Kabat et al.
Atkinson Charles E.
Siemens Aktiengesellschaft
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