| 摘要 |
PURPOSE:To make the system processing efficient by assigning the time transmitting a communication request from a master station to each slave station and allowing the master station to establish a data link with a slave station having high priority based on the transmitted communication request. CONSTITUTION:The master station 1 gives a common address GA to the slave stations 2a, 2b and 2c to inform timings Ta, Tb, Tc at which each slave station generates a communication request. Each slave station transmits the communication request to the master station 1 in the timing assigned to the own station. The master station 1 receives a communication request from a slave station having the highest priority among the communication requests and informs the permission of transmission to the slave station. When the slave station receives the transmission permission addressed to the own station, the slave station transmits data to the master station. Thus, the data transfer from the slave station to the master station is attained efficiently. |
