SIGNAL TRANSMITTING METHOD

PURPOSE:To reduce the load on a transmitter by providing a master device capable of transmission and reception, and generating a check sum code on the basis of a reception signal and transmitting it to a receiver. CONSTITUTION:Numbers of transmitters T1-Tn and receivers R1-Rn are connected to common transmission lines l1 and l2, and the master device M capable of transmissin and reception is connected. When some of the transmitters, e.g. T1 sends a bit-serial signal to the transmission lines l1 and l2, the address-specified receiver T2 fetches the signal in a specific register of its control circuit. The master device M, on the other hand, fetches it in its control circuit 2 and calculates the check sum code to send out a serial signal of the receive signal to the transmission lines l1 and l2. The receiver R2 receives the signal to perform a sum check, and validates the signal fetched in the register when normal. A specific resending request signal is generated when abnormal.