| 摘要 |
PURPOSE:To simplify the circuit and to save the transmission time by applying pulse width conversion to an analog signal so as to digitize it and sending once plural pieces of analog information. CONSTITUTION:A signal from analog sensors 101, 102,... is subject to pulse width conversion by using, e.g., a 10Hz rectangular wave by a pulse width converting circuit 21. The signal is inputted to a CIM 22 in parallel together with signals from switches 3, 4, the result is converted into a serial signal and sent to the CIM 24 via a signal line 20. The CIM 24 converts the serial signal into a parallel signal, a parallel output signal is amplified respectively by amplifiers 161, 162,...18, 19 to drive analog meters 301, 302,... lamps 9, 11. After the CIM 24 outputs the parallel signal, the CIM 24 converts the signal of the switches 12, 13 serially and sends it to a CIM 22 via the signal line 20, then the CIM 22 converts the serial input signal into a parallel signal, the output signal is amplified by amplifiers 14, 15 to drive lamps 5, 6.
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