| 摘要 |
PURPOSE:To prevent an operation error in case of switching the system, by connecting between the master station and the slave station by plural transmission lines, and sending out the switching information of the same system to the specified time slot of plural transmission lines, so that the system can be switched without an error by the slave station. CONSTITUTION:The master station and the slave station are connected by plural transmission lines L1, L2, a data from the master station, which has been transmitted by the transmission lines L1, L2 is discriminated by the discrimination part (not shown in the figure) provided on the slave station, and clocks CLK1, 2 are generated. These clocks CLK1, 2 are provided to the synchronizing circuits 1a, 1b and the timing circuit 2, one clock CLK1 or CLK2 is selected by the circuit 2, the timing signal is provided to the system switching information receiving part 3, and also the data is provided from the transmission lines L1, L2. And, the system switching information of the specified same time slot of the transmission lines L1, L2 is sampled in accordance with the timing signal in the receiving part 3, the system switching information of both the transmission lines L1, L2 is collated, and in case of coincidence, a system switching signal SC is sent out. |
