PURPOSE: To weight signals different in type or to easily control a controlled equipment by transmitting an address signal and type information simultaneously from the characteristic signal generator of plural fire, gas leakage, crime prevention sensors.

CONSTITUTION: When a switching element 12 connected to the sensor 11 is turned on, a pilot lamp 13 is lighted and a transmitter OSC is operated, and a start bit, an address bit, a type bit and a stop bit are sequentially preset and outputted for every overflow of a counter 22. Then, an alarm current is modulated and intermittently and repeatedly transmitted to lines l1, l2 through a driver 24. In a receiver, the read information is fed to a processing circuit, weighted according to the type to control a controlled circuit. Accordingly, the controlled equipment can be easily interlocked or the sensor can be exchanged correspondingly to the type.