| 摘要 |
PURPOSE:To provide a low-cost key telephone system that excludes any setting error by connecting directly a diode to a key input board and reading a set value in accordance with the connected status of the diode. CONSTITUTION:With power supply on, a microcomputer 7 detects the board to which a diode 11 for setting telephone set, then informs the value to a master station through a communication part 8 The station, as conventionally, discriminates the telephone set model and performs a control corresponding to the model. Thus, because the model setting is done by connecting the diode to a key input board, no additional board is necessary, and furthermore, the diode is mounted on a printed circuit board in production line to exclude errors in setting. In the figure, 9 and 10 represent a display part and key part to be scanned by the microcomputer 7, respectively. |
