| 摘要 |
PURPOSE:To omit a switching circuit and to decrease the number of connection cables with a remote supervising controller master station by providing the master station with buffers which serves as amplifiers. CONSTITUTION:The remote monitor controller master station 1 has buffer amplifiers 4-1 to 4-N, and 5-1 to 5-N (serving as amplifiers). The buffer amplifiers 4-1 to 4-N amplify a received signal and are connected to other lines through resistances 3-1 to 3-N. Further, a signals sent by the master station 1 is sent to slave stations 1-N through the buffer amplifiers 5-1 to 5-N. The master station and slave stations can make a mutual voice call from either side since the lines are connected at all times. |
