| 摘要 |
The object of the present invention is to provide a data transmission system, wherein even when more than two among a plurality of stations interconnected by one common transmission line try to communicate mutually by a start-stop transmission PWM mode, if the phases within a bit in the data of the own station and a corresponding bit of the data on the transmission line which has been received through a plurality of own station are compared and they coincide with each other as the result thereof, then the own station continues transmitting the data, while otherwise it comes to stop transmitting, whereby even if there is a difference between the clock frequency of the own station and that of another station, the phases in the corresponding bits of the two different data can be smoothly compared. In order to achieve the above objective, the present invention provides an external synchronizing means which, when a rising edge of the data on the transmission line received through a filtering means (RX data) is detected during the period in which the last phase of the data of the own station (TX data) is being transmitted, forces to transmit the next bit in the TX data in synchronization with the detection of the rising edge of the RX data.
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