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    • 4. 发明授权
    • Remote meter reader and method for reading meters over non-dedicated
telephone lines
    • 远程仪表读取器和用于通过非专用电话线读取仪表的方法
    • US4394540A
    • 1983-07-19
    • US264723
    • 1981-05-18
    • Alan E. WillisJohn R. LowdenslagerNeal Goldstein
    • Alan E. WillisJohn R. LowdenslagerNeal Goldstein
    • H04M11/00H04M11/08
    • H04M11/002
    • A meter reader is disclosed for automatically reading utility meters at a telephone subscriber station and transmitting the meter data read to a central office over non-dedicated telephone lines in response to a call initiated by the central office. The meter reader is located at the subscriber station and includes, a microprocessor, a telephone isolating device, a call answering device, a ring detector, an off-hook detector, a ring generator, a data transmitter-receiver device and a modem. Each day the telephone is isolated from the telephone lines for a predetermined data access time. Any call made to the subscriber station during the data access time is answered by the meter reader. A coded signal is sent out over the telephone lines by the meter reader for the purpose of determining the source of the call. If the call is from the central office a coded reply signal is sent back and, the meter reader transmits the data to the central office. If the coded reply signal is not returned, the meter reader generates ringing signals for activating the bell in the subscriber's telephone. If the subscriber telephone is picked up at any time during the data access time, it is immediately unisolated from the telephone line.
    • 公开了一种用于在电话用户台自动读取公用事业计量表的仪表读取器,并且响应于由中心局发起的呼叫,通过非专用电话线将读取的仪表数据传送到中心局。 仪表读取器位于用户站,并且包括微处理器,电话隔离设备,呼叫应答设备,环形探测器,摘机检测器,环形发生器,数据发射器 - 接收器设备和调制解调器。 每天电话与电话线隔离预定的数据访问时间。 在数据访问时间内对用户台进行的任何呼叫由仪表读取器应答。 编码信号由仪表读取器通过电话线路发送出去,以确定呼叫的来源。 如果呼叫来自中心局,则发回编码应答信号,并且仪表读取器将数据发送到中心局。 如果编码的回复信号没有返回,则仪表读取器产生用于激活用户电话中的铃声的振铃信号。 如果在数据访问时间内的任何时间接收到用户电话,则它将立即从电话线路中断开。