| 摘要 |
PURPOSE:To prevent surely the generation of error at reception side without incurring complicated wiring regardless of the generation of hit at a transmission line by generating a reception signal in response to the detected direction. CONSTITUTION:When an H level original transmission signal 100 is fed to a base of a transistor TR22 from a sensor circuit 20, the TR22 is turned on, its collector voltage goes to an earth level and a communication current flows to the TR22 from a resistor 30 via a transmission line 14. When the L level signal 100 is fed to the base of the TR22, the TR22 is turned off, a Zener diode 32 is turned on and a current flows to the diode 32 via the transmission line 14 from a resistor 28. The direction of the current is detected by a reception signal generating circuit 36 of a reception side circuit 12 and a reception signal 102 is generated from the detection result. |
