초록 ▼

A remote unit for a remote meter reading system. The remote unit initiates a telephone call to a central complex at a predetermined callback time. In response to an acknowledgement signal indicative of a completed connection, the remote unit transmits indicia of its identity and collected data. The

A remote unit for a remote meter reading system. The remote unit initiates a telephone call to a central complex at a predetermined callback time. In response to an acknowledgement signal indicative of a completed connection, the remote unit transmits indicia of its identity and collected data. The central complex responds with an instruction word, to control the next scheduled callback time and operational mode of the remote unit. Error code, load management and demand metering provisions are disclosed.

대표청구항 ▼

A method for remote monitoring of sensors adapted for automatic communication with a central complex through a telephone line, said central complex having a telephone number assigned thereto, comprising the steps of: selectively seizing said telephone line at a predetermined real time; generating si

A method for remote monitoring of sensors adapted for automatic communication with a central complex through a telephone line, said central complex having a telephone number assigned thereto, comprising the steps of: selectively seizing said telephone line at a predetermined real time; generating signals onto said telephone line representative of said central complex telephone number to address said central complex; generating, responsive to acknowledgement signals from said central complex, coded signals indicative of the identity of said sensors, and data indicative of the states of said sensors; and receiving and storing subsequent signals from said central complex indicative of the time of the next scheduled seizure of said telephone line.