| 摘要 |
PURPOSE:To prevent the deterioration of the performance of each secondary station by detaching an unnecessary load by comparing the contents recorded in an address storage device and a transmitting destination address in command data and eliminating the transmission of unnecessary data. CONSTITUTION:A down-telegraphic message (command) becomes a primary station side S/P conversion MPU RAM MPU P/S conversion a secondary station side, and an up-telegraphic message (response) becomes the secondary station side S/P conversion MPU RAM MPU S/P conversion the primary station.side. In such a state, address data transferred from the primary station is compared with the address set contents, and a data block of unnecessary address is revoked. It is executed between the MPU and the RAM in the down-telegraphic message. The speed conversion realizes a data transfer between different circuit temporarily speeds by storing temporarily the data between the primary station and the second station in a data buffer. |
