NETWORK SYSTEM, MASTER DEVICE, SLAVE DEVICE, AND START-UP CONTROL METHOD FOR NETWORK SYSTEM

摘要

A network system ( 10 ) comprises a master device ( 5 ) and a plurality of slave devices ( 1, 2, 3 ), and those devices are serially connected to one another in such a way that the master device ( 5 ) comes to the most upstream side, thereby configuring an optical multidrop network which ensures data transmission and reception by optical communications among contiguous devices. Each of the slave devices ( 1, 2, 3 ) self-controls so as to be in such a state as not to receive data from any slave device on the downstream side when starting an operation, and the master device ( 5 ) controls the individual slave devices ( 1, 2, 3 ) sequentially from the upstream side to the downstream side in such a way that each slave device is capable of receiving data from a downstream side slave device.