Central to remote signalling system having roll call interrogation

Claim 1

A SYSTEM OF TWO-WAY COMMUNICATION OVER A COMMUNICATION CHANNEL CONNECTING A CONTROL OFFICE AND A PLURALITY OF REMOTE FIELD STATIONS WHEREIN THE SYSTEM IS OPERABLE AT TIMES DURING A CONTROL CYCLE TO TRANSMIT SELECTED CODES FROM THE CONTROL OFFICE TO THE FIELD STATIONS AND AT OTHER TIMES DURING AN INDICATION CYCLE TO TRANSMIT SELECTED INDICATION CODES FROM ONE OF THE FIELD STATIONS TO THE CONTROL OFFICE COMPRISING, ROLL CALL TRANSMITTING MEANS AT THE CONTROL OFFICE FOR NORMALLY TRANSMITTING OVER SAID COMMUNICATION CHANNEL SUCCESSIVE SERIES OF RELATIVELY SHORT TIME SPACED ROLL CALL PULSES FOR QUICKLY SCANNING THE FIELD STATIONS, THERE BEING ONLY ONE PULSE FOR EACH FIELD STATION IN EACH SERIES OF PULSES, CONTROL DESIGNATING MEANS AT THE CONTROL OFFICE FOR DESIGNATING THE START OF A CONTROL CYCLE, INDICATION DESIGNATING MEANS AT EACH OF THE FIELD STATIONS FOR DESIGNATING THE START OF AN INDICATION CYCLE, CONTROL CODE TRANSMITTING MEANS AT THE CONTROL OFFICE CONTROLLED JOINTLY BY SAID CONTROL DESIGNATING MEANS AND BY SAID ROLL CALL TRANSMITTING MEANS FOR INITIATING A CONTROL CYCLE OF OPERATION FOR TRANSMISSION OVER THE COMMUNICATION CHANNEL OF SELECTED CONTROL CODE PULSES FOR A SELECTED FIELD STATION, SAID CONTROL CODE TRANSMITTING MEANS BEING RENDERED OPERABLE TO TRANSMIT ONLY DURING A TIME SPACE BETWEEN THE ROLL CALL PULSES, AND INDICATION CODE TRANSMITTING MEANS FOR EACH OF THE FIELD STATIONS CONTROLLED JOINTLY BY SAID INDICATION DESIGNATING MEANS AND SAID ROLL CALL PULSES FOR INITIATING AN INDICATION CYCLE OF OPERATION FOR TRANSMISSION OVER THE COMMUNICATION CHANNEL OF SELECTED INDICATION PULSES, SAID INDICATION CODE TRANSMITTING MEANS BEING RENDERED EFFECTIVE ONLY DURING THE RECEPTION AT THE ASSOCIATED STATION OF A PARTICULAR ROLL CALL PULSE, SAID ROLL CALL TRANSMITTING MEANS AT THE CONTROL OFFICE BEING CONTROLLED TO EXTEND THE DURATION OF A ROLL CALL PULSE TO COVER THE TIME OF TRANSMISSION OF INDICATION CODE DURING AN INDICATION CYCLE.

Claim 2

A SYSTEM OF TWO-WAY COMMUNICATION OVER A COMMUNICATION CHANNEL CONNECTING A CONTROL OFFICE AND A PLURALITY OF REMOTE FIELD STATIONS WHEREIN THE SYSTEM IS OPERABLE AT TIMES DURING A CONTROL CYCLE TO TRANSMIT SELECTED CODES FROM THE CONTROL OFFICE TO THE FIELD STATIONS AND AT OTHER TIMES DURING AN INDICATION CYCLE TO TRANSMIT SELECTED INDICATION CODES FROM ONE OF THE FIELD STATIONS TO THE CONTROL OFFICE COMPRISING, ROLL CALL TRANSMITTING MEANS AT THE CONTROL OFFICE FOR NORMALLY TRANSMITTING OVER SAID COMMUNICATION CHANNEL SUCCESSIVE SERIES OF RELATIVELY SHORT TIME SPACED ROLL CALL PULSES FOR QUICKLY SCANNING THE FIELD STATIONS, THERE BEING ONLY ONE PULSE FOR EACH FIELD STATION IN EACH SERIES OF PULSES, CONTROL DESIGNATING MEANS AT THE CONTROL OFFICE FOR DESIGNATING THE START OF A CONTROL CYCLE, INDICATION DESIGNATING MEANS AT EACH OF THE FIELD STATIONS FOR DESIGNATING THE START OF AN INDICATION CYCLE, CONTROL CODE TRANSMITTING MEANS AT THE CONTROL OFFICE CONTROLLED JOINTLY BY SAID CONTROL DESIGNATING MEANS AND BY SAID ROLL CALL TRANSMITTING MEANS FOR INITIATING A CONTROL CYCLE OF OPERATION FOR TRANSMISSION OVER THE COMMUNICATION CHANNEL OF SELECTED CONTROL CODE PULSES FOR A SELECTED FIELD STATION, SAID CONTROL CODE TRANSMITTING MEANS BEING RENDERED OPERABLE TO TRANSMIT ONLY DURING A TIME SPACE BETWEEN THE ROLL CALL PULSES, AND INDICATION CODE TRANSMITTING MEANS FOR EACH OF THE FIELD STATIONS CONTROLLED JOINTLY BY SAID INDICATION DESIGNATING MEANS AND SAID ROLL CALL PULSES FOR INITIATING AN INDICATION CYCLE OF OPERATION FOR TRANSMISSION OVER THE COMMUNICATION CHANNEL OF SELECTED INDICATION PULSES, SAID INDICATION CODE TRANSMITTING MEANS BEING RENDERED EFFECTIVE ONLY DURING THE RECEPTION AT THE ASSOCIATED STATION OF A PARTICULAR ROLL CALL PULSE, SAID ROLL CALL TRANSMITTING MEANS AT THE CONTROL OFFICE BEING CONTROLLED TO EXTEND THE DURATION OF A ROLL CALL PULSE TO COVER THE TIME OF TRANSMISSION OF INDICATION CODE DURING AN INDICATION CYCLE.