| 摘要 |
PURPOSE:To reduce the overhead cost of the communication controlling program and to improve the processing capacity, by reducing the number of participations of program processing in the transfer of message blocks between a high- order device and the communication controller. CONSTITUTION:A processor 90 executes communication control processings, and plural message blocks to be used for data communication with a high-order device are stored in a memory 100. First-in first-out cues 80 and 70 for transmission and reception store the information which represents positions of each said message block which is to be transmitted and which has been received in the memory 100. When the transmission is completed, a transmission controlling circuit 50 controls the storage of the position information of the message block in the memory in another first-in first-out cue 60. When the reception is completed, a reception controlling circuit 40 stores the position information in the out cue 70 for reception. |
