초록 ▼

A remote telemetry unit (RTU) for use in an automated telemetry paging system for providing remote pager notification of changes in selected operating parameters measured at a specific site location. The selected parameters and the unacceptable changes therein are provided in the form of a plurality

A remote telemetry unit (RTU) for use in an automated telemetry paging system for providing remote pager notification of changes in selected operating parameters measured at a specific site location. The selected parameters and the unacceptable changes therein are provided in the form of a plurality of electrical status signals each representative of one of the selected parameters. The RTU includes a programmed microprocessor, including data input/output circuits, a memory circuit, a central processing unit (CPU) and a real time clock. The RTU also includes a status signal receiving circuit for receiving and electronically isolating and digitally shaping the received status signals. An interrogation circuit controlled by the CPU scans the digital status signals, and a discrimination circuit controlled by the CPU reads the digital status signals and determines if a valid deviated or changed status signal is present. If a valid change has occurred, a formatting circuit controlled by the CPU format a digital message to indicate the site location and codes for indicating the changed status or deviation of the monitored parameters. The digital status signals are transmitted to appropriate pager communications equipment for display in remote paging devices.

대표청구항 ▼

In an automated telemetry paging system for providing remote pager notification of deviations in selected operating parameters measured at a specific site location wherein indication of each of the selected parameters and the unacceptable deviation therefrom is provided in the form of a plurality of

In an automated telemetry paging system for providing remote pager notification of deviations in selected operating parameters measured at a specific site location wherein indication of each of the selected parameters and the unacceptable deviation therefrom is provided in the form of a plurality of electrical status signals each representative of one of the selected parameters, telephone company line connections to telephone central switching equipment for dialing selected telephone numbers is provided at the site location, and pager network communications equipment is provided that is in communication with the telephone central switching equipment and in communication with a plurality of paging devices, a remote telemetry unit located at the site location comprising a programmed microprocessor including data input/output means, memory means, a central processing unit (CPU), and a real time clock, status signal receiving means for receiving and isolating the received electrical status signals, said receiving means isolating said received signals for eliminating short duty-cycle over-voltage signals and shaping said received signals into digital signals representative of said received status signals, said digital signals applied as inputs to said input/output means, interrogation means controlled by said CPU and cooperating with said real time clock for continuously scanning said digital status signals applied to said input/output means at a predetermined rate, discrimination means controlled by said CPU for reading and comparing said digital status signals applied to said input/output means against a current status signal reference stored in said memory means and in response to detecting a deviation therefrom initiating a time delay prior to again reading and comparing said digital status signals against said current status signal reference, and if said second comparison after said time delay detects a deviation from said reference signalling said CPU of the presence of a valid status signal indicating an unacceptable parameter deviation, formatting means controlled by said CPU for reading said digital status signals, correlating said digital signals with a message table preprogrammed into said memory means and converting said digital status signals appearing at said input/output means into a digital status message of a preselected format that is representative of the identification of the specific site location and successive codes indicating the parameters that have reached an unacceptable deviation, digital to multiple frequency (DTMF) conversion means for converting said digital status message generated by said formatting means to audio frequency signals for transmission over the telephone lines to said paging network equipment, and telephone interface means for interfacing between said DTMF conversion means and the telephone company line interconnected to the telephone central switching equipment for applying audio frequency telephone signals to the telephone lines for application to said telephone central switching equipment and the pager network equipment, wherein said CPU in response to said formatted digital status message reads digital signals stored in said memory means representative of a preselected number of pager telephone numbers and applies said digital signals in serial order to said DTMF conversion means for converting said signals representative of said pager telephone numbers to audio frequency signals for application through said telephone interface means and the telephone central switching equipment directly to the paging network equipment for automatically and sequentially dialing said preselected pager telephone numbers, and wherein said CPU further applies said digital status message in serial order to said DTMF conversion means for converting said digital signals to audio frequency signals for transmission over the telephone lines to the pager network equipment for broadcast to the paging devices for alphanumeric display and said digital status message therein in said preselected message format.