| 摘要 |
PURPOSE:To permit the input of various operation commands by the common use of an analog-digital converter by processing numeral analog signal pressure corresponding to controlling function into a digital signal selectively. CONSTITUTION:A multiplexer 8 to select signal line input by the selective signal 10a of a digital computer 10 alternately outputs the signal voltages V1-V3 of resistance voltage dividing circuits 5-7 and the signal voltage Vs from signal processing circuit such as a temperature sensor, etc. Also, an analog-digital processing circuit 9 compares the analog conversion voltage of a digital value signal 10b with output signal voltage 8a from the multiplexer 8 and gives a signal 9a to the computer 10, where these operations are repeated in such a way that the signal 10 is recognized as an analog signal voltage by the computer 10. The computer 10 determines the operation of air conditioner on the basis of various digital value signals and performs a treatment in the process of control program in order to judge how each of switching groups 1, 2, and 3 is opened or closed. |
