| 摘要 |
PURPOSE:To perform efficient operation without using a complicate multiprocessing program, and to increase the degree of freedom of physical arrangement, by providing a small-scale processor for every objective of a device to be controlled. CONSTITUTION:A key telephone device consists of a trunk circuit 4 equipped with >=1 trunk line 1, a sender circuit 2 which sends a selection signal to the trunk line 1, telephone sets 10 and 12, an extension circuit 6 which allows a telephone call between telephone sets, and a channel switch 8 which connects one telephone set to the other telephone set or trunk line. Then, processors 3, 5, 7, 9, 11, and 13 are installed to control the sender circuit 2, trunk circuit 4, extension circuit 6, channel switch 8, and telephone sets 10 and 12 exclusively. Those processors are coupled respectively through a serial data bus 14, and optional processors are allowed to have mutual communication. |
