| 摘要 |
PURPOSE:To increase the reliability of the transmission by providing the input latch circuit to the input of the terminal unit and the circuit which detects the change of the output of the terminal unit and then generates the output pulse to the output of the terminal unit respectively and then resetting the input latch circuit with the output pulse. CONSTITUTION:Input latch circuit 7 is provided between terminal unit 2a and operation switch 4, and at the same time pulse generating circuit 8 is installed at the output side each. When switch 4 is pushed, output B of circuit 7 is set at the H level. Thus unit 2a transmits the H level to the master unit. At the same time, the pulse differentiated by capacitor Co is supplied to circuit 8. And the output of unit 2a becomes different from the former state when the control data comes back with inversion from the master unit. As a result, the output of circuit 8 sets the output of circuit 7 again to the L level. Now if the transmission error of the return signal occurs temporarily owing to the noise of the thunder or the like, circuit 7 transmits the output continuously unitil the data of the output terminal of unit 2a reverses. Thus the signal is transmitted correctly when no noise exists to realize an assured transmission system. |
