| 摘要 |
PURPOSE:To impart the same time to each processor, by providing a means, which transmits the time of the built-in clock of one of data transmission apparatuses to the other transmission apparatus, to one of the data transmission apparatuses and providing a means correcting the time of the built-in clock to the other data transmission apparatus. CONSTITUTION:The output of a receiving circuit 11 is analyzed by a command analyzing circuit 12 and, when the analytical result is a clock setting command, the output of the circuit 12 is inputted to a clock transmission part 13 and, when said result is other than the clock setting command, the output of the circuit 12 is inputted to a transmission line transmitting circuit 15. The clock transmission circuit 13 sets the time of a built-in clock 14 to the data part of a transmission data frame and the output of the circuit 15 is sent out to a data transmitting line 4. Next, the time of the clock 14 is corrected, the output of the transmission line 4 is inputted to a transmission line receiving circuit 16 to be analyzed by a command analyzing circuit 17. When this analytical result is a clock setting command, the output of the circuit 17 is inputted to a clock correction part 18 and, when said result is other than the setting command, the output of the circuit is inputted to a transmission circuit 19. The output of the circuit 19 is inputted to a processor 2 or monitor apparatus 3. Therefore, when each processor reads time, the same time is obtained.
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