| 摘要 |
A plurality of smoke (or heat) detector-transmitter units (17, 19) and/or a plurality of intrusion detector-transmitter units (21) are mounted at various positions throughout a premises to be protected (11a, 11b, 11c . . . ). The units are wireless and transmit a signal whose code relates to whether the unit is a smoke (or heat) detector-transmitter unit (17, 19) or an intrusion detector-transmitter unit (21). Also located on the protected premises (11a, 11b, 11c . . . ) is a receiver-alarm unit (23) that receives and decodes the signals produced by the smoke (or heat) detector-transmitter and intrusion detector-transmitter units (17, 19, 21). Upon receipt of a coded signal, the receiver-alarm unit (23) automatically seizes the telephone line (13a, 13b, 13c . . . ) running from the protected premises (11a, 11b, 11c . . . ) to a central location (15) and produces an "operator" dial signal. The receiver-alarm unit ( 23) also produces an alarm signal whose tone is related to whether the received coded signal was produced by a smoke (or heat) detector-transmitter unit (17, 19) or an intrusion detector-transmitter unit (21). When the central location (15) responds to the "operator" dial signal, the alarm tone is applied to the telephone line (13a, 13b, 13c . . . ). Thus, the operator hears the alarm, as well as sees the premises telephone number, which is produced at the operator's console (29) by the automatic number identification (ANI) circuitry of the central location (15). Thus, the operator has all of the information needed to respond in a suitable matter, i.e., call the fire or police department. The receiver-alarm unit (21) includes a manually operated delay switch (67) that can be used by a subscriber to delay the sending of a "fire" alarm tone to the central location (15) while a potential fire situation is being evaluated. The receiver-alarm unit (21) also includes a manually operable send immediate switch ( 69) that in combination with an activate switch (70) or a received fire alarm signal can be used to cause the telephone line to be seized and the fire alarm tone sent immediately.
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