Code integrity checks for coded remote control systems

Claim 1

IN A CODED REMOTE CONTROL SYSTEM INCLUDING A PLURALITY OF LOCATIONS CONNECTED BY A COMMUNICATION CHANNEL, SAID SYSTEM BEING OPERABLE TO TRANSMIT FUNCTIONS OVER SAID CHANNEL IN THE FORM OF STEPPED CODES AT LEAST FROM ONE OF SAID LOCATIONS TO ANOTHER OF SAID LOCATIONS, EACH CODE STEP HAVING A LONG DURATION FIRST OR SHORT DURTION SECOND CHARACTER, EACH CODE FROM SAID ONE LOCATION INCLUDING A FIRST PORTION OF SUCCESSIVE STEPS WHICH CHARACTER A STATION CALL COMBINATION OF FIRST AND SECOND CHARACTER CODE STEPS UNIQUE TO SAID ONE LOCATION AND A SECOND PORTION WHICH DEFINES TRANSMITTED FUNCTIONS BY SUCCESSIVE SELECTED FIRST AND SECOND CHARACTER CODE STEPS, THE FIRST CHARACTERS STEPS OF SAID STATION CALL HAVING A DISTINCT TOTALIZED CHARACTERISTIC, THE COMBINATION COMPRISING: (A) A FIRST AND A SECOND COUNTING MEANS AT SAID ONE LOCATION EACH OPERABLE BETWEEN TWO CONDITIONS WHEN SUCCESSIVELY ACTUATED, (B) A DRIVE CIRCUIT CONTROLLED BY SAID SYSTEM FOR SUCCESSIVELY ACTUATING SAID FIRST COUNTING MEANS TO RECORD EACH FIRST CHARACTER CODE STEP IN A FIRST GROUP OF CODE STEPS TRANSMITTED DURING SAID SECOND PORTION OF A PARTICULAR CODE, (C) ANOTHER DRIVE CIRCUIT CONTROLLED BY SAID SYSTEM FOR SUCCESSIVELY ACTUATING SAID SECOND COUNTING MEANS TO RECORD EACH FIRST CHARACTER CODE STEP IN A SECOND GROUP OF CODE STEPS TRANSMITTED ALTERNATELY WITH SAID FIRST GROUP CODE STEPS DURING SAID SECOND PORTION OF SAID PARTICULAR CODE, (D) CIRCUIT MEANS AT SAID ONE LOCATION WITH CONNECTIONS TO SAID SYSTEM AND CONTROLLED BY BOTH ASSOCIATED COUNTING MEANS AND RESPONSIVE TO THE TOTALIZED CHARACTERISTIC OF THE STATION CALL FOR EFFECTING THE TRANSMISSION DURING SAID PARTICULAR CODE SUBSEQUENT TO SAID SECOND PORTION THEREOF OF SEPARATE INDICATIONS CHARACTERIZING THE COMBINED CHARACTERISTICS OF THE STATION CALL TOTALIZED CHARACTERISTIC AND THE EXISTING CONDITION OF EACH COUNTING MEANS, (E) REGISTRY MEANS AT SAID OTHER LOCATION RESPONSIVE TO SYSTEM OPERATION FOR RECORDING THE CHARACTERIZING INDICATIONS RECEIVED DURING A CODE, (F) A THIRD AND A FOURTH COUNTING MEANS AT SAID OTHER LOCATION EACH OPERABLE BETWEEN TWO CONDITIONS WHEN SUCCESSIVELY ACTUATED, (G) DRIVE CIRCUIT MEANS CONTROLLED BY SAID SYSTEM AND HAVING CONNECTIONS FOR SUCCESSIVELY ACTUATING SAID THIRD AND FOURTH COUNTING MEANS TO RECORD EACH FIRST CHARACTER CODE STEP IN SAID FIRST AND SAID SECOND CODE STEP GROUPS RESPECTIVELY RECEIVED DURING SAID SECOND PORTION OF SAID PARTICULAR CODE, (H) A STATION SELECTION MEANS AT SAID OTHER LOCATION CONTROLLED BY SAID SYSTEM FOR REGISTERING THE STATION CALL COMBINATION RECEIVED DURING SAID FIRST PORTION OF SAID PARTICULAR CODE, (I) COMPARISON CIRCUIT MEANS AT SAID OTHER LOCATION CONTROLLED JOINTLY BY SAID THIRD AND FOURTH COUNTING MEANS, BY SAID STATION SELECTION MEANS, AND BY SAID REGISTRY MEANS FOR COMPARING THE COMBINED CHARACTERISTIC PROVIDED BY THE EXISTING CONDITION OF SAID THIRD AND FOURTH COUNTING MEANS AND THE TOTALIZED CHARACTERISTIC OF THE REGISTERED STATION CALL COMBINATION WITH THE REGISTERED CHARACTERIZING INDICATIONS, (J) SAID COMPARISON CIRCUIT MEANS HAVING CONNECTIONS, FOR EFFECTING THE COMPLETION OF THE RECEPTION OF SAID PARTICULAR CODE AND THE FINAL REGISTRY OF THE FUNCTIONS CARRIED THEREBY ONLY WHEN TE COMPARISON DETERMINES EACH CORRESPONDING PAIR OF COMPARED CHARACTERISTICS TO BE EQUIVALENTS.