| 摘要 |
PURPOSE:To transmit an urgent signal speedily without any hindrance, by sending an emergency control signal while other transmitters stop sending signals temporarily due to an error of transmission caused by a signal for interruption such as the emergency signal. CONSTITUTION:In a figure, the 1st one-shot multivibrator 16 operates at a rise of the output of an input part 6, and the 2nd one-shot multivibrator 17 operates at a rise of the output of the 1st one-shot multivibrator 16 to send its output to a transmission data generation part 7; and an OR gate 18 inputs the output of the 1st one-shot multivibrator 16 and the output of the transmission part 8 and supplies its output to a modulation and demodulation part 13, and an AND gate 19 inputs the output of the modulation and demodulation part 13 to a reception data regeration part 12 only when the output of the 1st one-shot multivibrator 16 is at a level L. Thus, when there is an input from a switch 5, a busy signal is outputted firstly regardless of whether a circuit is used or not to stop the signal transmission of other transmitter and receivers temporarily, and an interruption to the circuit is caused. |
