| 摘要 |
PURPOSE:To connect a master station and plural slave station by two common lines and to facilitate wiring work by controlling the master and slave stations by a microcomputer, etc., and also to shorten an operation time by eliminating malfunction at the master station and performing a direct communication among the slave stations. CONSTITUTION:Two common lines such as power lines l are connected to plural slave stations 1a-1h installed in respective rooms of a building and the master station 2 is connected to the power lines l to constitute a communication system. Those slave stations 1a-1h are each provided with a processing circuit 8A consisting of a microcomputer, etc., and a receiving circuit 10A which receives signals from the power lines l and a transmitting circuit 9A which transmits data to the power lines l are connected to the processing circuit 8A. Further, a dip switch 6 for setting unit codes of the slave stations 1a-1h previously, a call button 3, a call sign light emitting diode 4 for displaying a call, and an alarm sound generator 7 are connected to the processing circuit 7. Thus, the wiring work is facilitated and malfunction at the master station is eliminated to perform a direct communication among the slave stations 1a-1h. |
