Supervisory control system with message traffic control

• US 3,349,374 A
• Filed: 08/05/1963
• Issued: 10/24/1967
• Est. Priority Date: 08/05/1963
• Status: Expired due to Term

• Current Assignee: Lawrence R. Smith, Reidar G. Gabrielson
• Original Assignee: Lawrence R. Smith, Reidar G. Gabrielson
• Inventors: Gabrielson, Reidar G., Smith, Lawrence R.
• Application Number:
  US04/299,859
• Time in Patent Office: 1,541 Days
• US Class Current: 340/3.41
• CPC Class Codes: G08B 29/00 Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
• CPC Class Codes: G08C 25/00 Arrangements for preventing or correcting errors; Monitoring arrangements
• CPC Class Codes: H04Q 9/14 Calling by using pulses

Claims

17. A DIGITAL COMMUNICATION SYSTEM HAVING A CENTRAL STATION AND A PLURALITY OF REMOTE STATIONS JOINED BY A COMMON COMMUNICATION CHANNEL WITH THE CENTRAL STATION HAVING FIRST TRANSMITTING MEANS, FIRST RECEIVING MEANS, AND DATA PROCESSING MEANS, AND EACH OF THE REMOTE STATIONS HAVING SECOND TRANSMITTING MEANS, SECOND RECEIVING MEANS, AND SECOND DATA PROCESSING MEANS, AND THE STATIONS INTERCHANGING DIGITALLY ENCODED SIGNALS OVER THE COMMON CHANNEL, THE IMPROVEMENT INCLUDING IN COMBINATION, THE FIRST AND SECOND DATA PROCESSING MEANS BEING OPERATIVE TO EFFECT A FIRST TYPE OF COMMUNICATION OPERATION BETWEEN THE CENTRAL AND REMOTE STATIONS, MESSAGE SECURITY MEANS IN THE FIRST DATA PROCESSING MEANS EXAMINING EACH RECEIVED MESSAGE FOR CORRECTNESS AND SUPPLYING A FIRST SIGNAL UPON DETECTION OF AN INCORRECT MESSAGE, ENCODING MEANS RESPONSIVE TO SAID FIRST SIGNAL TO SUPPLY A UNIQUE COMMAND SIGNAL TO THE FIRST TRANSMITTING MEANS FOR TRANSMISSION TO ALL THE REMOTE STATIONS, EACH REMOTE STATION HAVING MEANS FOR INDICATING A RECENT MESSAGE TRANSMISSION THEREFROM, EACH OF THE SECOND DATA PROCESSING MEANS BEING INDEPENDENTLY JOINTLY RESPONSIVE TO RECEIPT OF SAID UNIQUE COMMAND SIGNAL AND THE RESPECTIVE RECENT MESSAGE TRANSMISSION INDICATIONS TO INITATE A RETRANSMISSION OF EACH OF SAID RECENT MESSAGES, RESPECTIVELY, AND EACH SECOND DATA PROCESSING MEANS INCLUDING A TIMING MEANS PRESET TO TIME OUT A GIVEN CYCLE, THE DURATION OF WHICH IS DIFFERENT THAN THE DURATION OF ANY OTHER REMOTE STATION GIVEN CYCLE AND INHIBITING SUCH RETRANSMISSIONS UNTIL EXPIRATION OF SAID GIVEN CYCLES, RESPECTIVELY.