公开(公告)号：US4032908A

公开(公告)日：1977-06-28

申请号：US592425

申请日：1975-07-02

申请人： Richard C. Rice ,  Barry N. Horn

发明人： Richard C. Rice ,  Barry N. Horn

IPC分类号： G08B25/00 ,  G08B26/00

CPC分类号： G08B25/00 ,  G08B26/006

摘要： A plurality of alarm conductors are coupled to a multiplexer which connects the conductors one at a time in sequence to the input of an alarm detector which detects alarm conditions on the conductors. A shift register having the same number of stages as the number of alarm conductors has its input coupled to the multiplexer output and its output coupled back to its input to form a recirculating serial memory. The shift register is clocked in synchronism with the multiplexer. The output of the shift register is selectively coupled through a switchable memory output control to the input of the alarm detector to recall a previous alarm condition on one or more of the alarm conductors. A second shift register having a number of stages equal to an integral multiple of the number of alarm conductors has its input coupled to the output of the alarm detector means. The second shift register is also clocked in synchronism with the multiplexer. An exclusive OR circuit has one input coupled to the output of the second shift register, another input coupled to the output of the alarm detector, and the output coupled to the control means for a data transmitter which transmits the alarm to a remote location. The second shift register and exclusive OR circuit limit the number of times the alarm is transmitted to the remote location.

公开(公告)号：US3939460A

公开(公告)日：1976-02-17

申请号：US463713

申请日：1974-04-24

申请人： Barry N. Horn ,  Richard S. Swain ,  Richard C. Rice

发明人： Barry N. Horn ,  Richard S. Swain ,  Richard C. Rice

IPC分类号： G08B25/00 ,  G08B26/00

CPC分类号： G08B26/006 ,  G08B25/00

摘要： Fire alarm and intrusion alarm conductors are wired from a plurality of dwellings to a nearby data transmitter circuit which is linked by a single pair of conductors to a remote data receiver circuit. The alarm conductors are sequentially scanned in the data transmitter circuit by a binary counter which sequentially enables or opens gates that are coupled to the alarm conductors. When an alarm condition is detected on one of the alarm conductors, the scanning counter is stopped and the counter number is converted from parallel form to serial form. The serial number is transmitted from the data transmitter circuit to the data receiver circuit. The least significant bit of the number signifies whether the alarm is a fire or an intrusion. The remaining bits signify the location. In the receiver circuit, the received data is converted back to parallel form and is printed out on a printer. The transmitted data includes a first bit which is always a binary 1 and a last bit which is always a binary zero. The first bit starts the serial to parallel converter in the receiver circuit and the last bit insures that the output of the parallel to serial converter in the transmitter circuit is left in the low state after the transmission is completed. The data is preferably transmitted from the transmitter circuit to the receiver circuit by frequency shift keying. The data is clocked out of the parallel to serial converter and into the serial to parallel converter by clock pulses which are derived by dividing down the frequency of the frequency shift keying carrier.

摘要翻译： 火灾报警和入侵报警导体从多个住宅接线到由一对导体链接到远程数据接收器电路的附近数据发射机电路。 报警导体通过二进制计数器在数据发送器电路中顺序地扫描，该二进制计数器依次启用或打开耦合到报警导体的门。 在其中一个报警导体上检测到报警条件时，扫描计数器停止，计数器编号从并行形式转换为串行形式。 序列号从数据发送电路传输到数据接收电路。 数字的最低有效位表示报警是火还是入侵。 剩余的位表示位置。 在接收机电路中，接收到的数据被转换成并行形式，并被打印在打印机上。 发送的数据包括总是二进制1的第一位和总是二进制零的最后一位。 第一位在接收机电路中启动串行到并行转换器，最后一位确保发送器电路中的并行到串行转换器的输出在传输完成后保持在低电平状态。 数据优选地通过频移键控从发射机电路发送到接收机电路。 数据通过时钟脉冲从并行到串行转换器的时钟脉冲输出到串并转换器中，时钟脉冲是通过分频频移键控载波的频率得出的。