| 摘要 |
<p>PURPOSE:To improve the sureness and reliability by controlling time, calendar and calendar time by a transmission interface (I/F) of each station, thereby transmitting and receiving data. CONSTITUTION:A calendar 2b of a dual port memory(DPM) 2 of stations A-D is revised by a transmission l/F3. For example, when the station A implements time synchronization, the transmission I/F3 transfers clock data (current time) in a time synchronization command 2a in the DPM 2 to a calendar 2b and sets the command 2a to a transmission buffer 3b. In this case, data in the calendar 2b are set to the transmission buffer 3b. The transmission I/F3 sends data of the transmission buffer 3b to each of the stations B-D in a way of multiple address communication to start a re-transmission timer. The transmission I/F3 of the stations B-D receives a command from the station A and transfers the clock data to the calendar 2b of the DPM 2. A CPU 1 sets the calendar time to a clock 1a in the CPU 1.</p> |
