| 摘要 |
There are provided a plurality of terminals (10, 20, 30) which are connected by a power line (1) and exchange information through the power line (1) and to which intrinsic terminal identifiers are respectively given, and the feature is that each of the terminals (10, 20, 30) holds a house code to prevent interference between another system and its own system, and the house code is generated as a code common to the same system on the basis of the terminal identifier given to a master terminal selected from the respective terminals (10, 20, 30) belonging to the same system.
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