SHIFT TRANSMISSION SYSTEM

PURPOSE:To control plural detecting media through a few transmission lines by responding to a signal for different periods at the time when the detecting medium is turned ON/OFF successively from a foremost stage input terminal connected to a controller while a current is supplied from a controller side. CONSTITUTION:At the time when a sensor circuit S is turned ON,, a transmitting gate G2 is turned ON for the period (T1) until reference voltage (Vt1) generated through a set resistor RS1 and a control resistor Rc matches with the charge voltage (Vc) of a timer capacitor Ct, and at the time when the sensor circuit S is turned OFF, the transmitting gate G2 is turned ON for the period (T2) until the reference voltage (Vt2) generated by only the set resistors Rs1 and Rs2 matches with the charge voltage (Vc). Then, while the transmitting gate G2 is kept ON, namely, while a signal current is generated, the signal current is extracted at a controller SU side as potential difference at both the terminals of an extracting resistor Rp, and the turning ON/OFF of the sensor circuit S is decided. Thus, plural detecting media can be controlled by a few transmission lines.