Patent ID: 6721338
Filing Date: 2004-04-13
Classification: H04L

Abstract:
Synchronous communication systems including one control apparatus and at least one controlled apparatus carrying out synchronous communication with said control apparatus under control of said control apparatus in a predetermined order, each of a plurality of said synchronous communication systems is located adjacently, said synchronous communication system comprising in said control apparatus:a transmission unit transmitting a packet stored with control information to said at least one controlled apparatus, a reception unit receiving at least a packet stored with response corresponding to contents of the packet transmitted by said transmission unit from said at least one controlled apparatus, an error count unit counting the numbers of synchronous communication errors occurred and the number of times a packet from said at least one controlled apparatus was not received by said reception unit within a constant period carrying out said synchronous communication with said at least one controlled apparatus, a packet count unit counting how many of packets transferred in another said synchronous communication system is received by said reception unit in said constant period, and a communication timing adjust unit adjusting timing of said synchronous communication according to a predetermined procedure based on count results of said error count unit and said packet count unit.