| 摘要 |
PURPOSE:To simplify the wiring by arranging only a switch for closing corresponding to each operation to an operating section and connecting the switch to a control mechanism through two signal wires. CONSTITUTION:A control section A is provided with a microcomputer 2, an output buffer 3, and an input buffer 4, and an operating section B is provided with a 2n notation counter 5, an oscillator 6, an operating switch 7, and an indicator diode lamp 8 corresponding to the switch 7. When a current is applied from the output buffer 3 to the operating section B, a timing pulse is generated. Since this pulse drops momentarily a voltage of the signal line 1, it is received by an input buffer 4 and given to the microcomputer 2. When the timing pulse is detected, the microcomputer 2 calculates n-division and then detects the divided pulse to which a pulse is incoming and outputs a power supply voltage from the control section A in the timing lighting the indicator lamp 8 corresponding to the signal from the operating section B. |
