Patent ID: 8896392

Claim:
A transmission system comprising: a receiver; a plurality of sensors; and a pair of transmission lines that electrically connect the receiver to the plurality of sensors, wherein the receiver regularly polls the plurality of sensors by outputting a voltage pulse to between the pair of transmission lines as a bit string corresponding to a downward telegraphic message, each of the plurality of sensors transmits a response to the receiver by outputting a current pulse to between the pair of transmission lines as a bit string corresponding to an upward telegraphic message, the receiver includes a transmission circuit section that outputs the voltage pulse and receives the current pulse, and a first resistor having a predetermined resistance value depending on a characteristic impedance of the pair of transmission lines, the first resistor is connected in series between the transmission circuit section and only one of the pair of transmission lines, and each of the plurality of sensors does not include a resistor having a predetermined resistance value depending on a characteristic impedance of the pair of transmission lines.