| 摘要 |
PROBLEM TO BE SOLVED: To structure an LAN system wherein local systems connected to the same line with a main system connected to a LAN line do not interfere with each other without increasing a line nor a communication protocol. SOLUTION: In an LAN system wherein a local system 2 connected to the same LAN line with the main system, the main system 1 and local system 2 have a master A and slaves B to D and the master and slaves each have a transmitting and receiving function. The master A' and slave B' of the local system have an individual communication with each other and receive only a broadcasting communication from the main system 1. The master A' and B' of the local system 2 receive necessary previously set data included in the transmitted broadcasting communication only in such a case.
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