LOOP COMMUNICATION SYSTEM

摘要

PURPOSE:To perform instantaneously the transmission/reception processing of signals with no waiting mode by transmitting a control signal to a node connect to a terminal from a node connected to a host computer and controlling the timing between transmission and reception of a frame. CONSTITUTION:Data communication is carried out between a host computuer 1 and terminals A-C respectively via a node 3 at the host side, a loop transmission line 8 and nodes 5-1-5-3 at the terminal side. Processing 10 is carried out at an interval ti for times ts-1-ts-3 when the first fixed length of a frame is sent. The first frame is regarded as control signals CS-1-CS-3 sent from the computer 1 at nodes 5-1-5-3. Then the reception processing 11 is carried out. The storage of signals is started immediately after the end of the processing 11. The transmission processing 13 is carried out immediately when the time tp elapses since the processing 12 is through with nodes 5-1-5-3. Then the reception processing 14 is carried out immediately at the node 3. Then transmission processing 15 is carried out at this time point since a frame of a fixed length to be sent to the terminal is stored.