| 摘要 |
PURPOSE:To eliminate the waveform distortion, by transmitting a multi-polarity signal of the pulse transmitted to a part to be controlled from a control part and giving the shaping of waveform to the transmitted pulse at the part to be controlled by means of a diode. CONSTITUTION:A synchronous pulse, an address code, a command signal, etc. are produced from a logical circuit part a2 by operating a selection control switch a1 at a control part A. Thus line driver circuits a5 and a6 are actuated, and the energy of power supplys a3 and a4 is supplied to transmission lines l1 and l2 in accordance with the signal. The transmitted pulse is transmitted alternately in the form of a multi-polarity signal and with the same contents of signal for polarities l1 and l2. At a part Bi to be controlled, the power supply is charged with a diode bridge BG and a smoothing capacitor C, and at the same time the received waveform is shaped by a circuit of a resistance R and a Zener diode ZD. Then the received signal is supplied to a logic deciding circuit b1 and a relay drive circuit b2 is actuated in accordance with a command given from the part A. The state of a monitor contact group b4 is sent back via a display signal transmitting circuit b3. The part A receives and decided the sent-back signal at a receiving circuit a7 to display it through a display lamp 8. |
