| 摘要 |
PURPOSE:To prevent data from flowing from an unsubscribed terminal equipment by allowing each subscriber terminal equipment in a data communication network to supervise a sent data transmission station address and to output a disturbing data when the address is coincident with the own address. CONSTITUTION:The subscriber terminal equipment 111-115 using the bus transmission line 12 of a data communication network in common have respectively corresponding address to supervise data flowing to the line 12. If a data from an unsubscribed terminal equipment 116 flows to the network intensionally or in error, the subscriber terminal 113 whose address is coincident with the sending station address outputs a disturbing data. The subscriber terminal equipment 11 being a reception station inputs the synthesized data between the data from the equipment 116 and the disturbing data and does not fetch any data.
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