| 摘要 |
PURPOSE:To reduce the number of processings at a master station side and to save time and labor to calculate a transmission delay value according to the addition of a slave station and to add a preset value on the master station by providing a processing part which performs time synchronization between the master station and the slave station at the slave station. CONSTITUTION:The master station 1 sends a notice (a) to take the synchronism of time from a synchronizing signal sending part 11 to the slave station 2, and the slave station 2 sends slave station present time b, from a slave station clock 22 to a synchronizing time calculation processing part 21 replying to the above notice, and furthermore, the synchronizing time calculation processing part 21 replies to a synchronizing signal sending part 11 by sending a slave station time notice (b). The master station 1, replying to the above, sends a master station time notice C to the synchronizing time calculation processing part 21 after inputting the slave station present time b1, master station present time C2, and master station internal processing time C1 to the notice C. The slave station 2 calculates the transmission delay value based on a difference between the reception time of the master station time notice (c) and the time synchronism notice (a), and the master station internal processing c1, and adds the transmission delay value on the master station present time c2, and sets an obtained time value on the slave clock 22 as the present synchronizing time (d). |
