| 摘要 |
PROBLEM TO BE SOLVED: To attain communication between a plurality of master nodes included in a network and all slave nodes. SOLUTION: A master node 10B transmits a request message including a requester station number specifying its own station and a request message ID identifying the request message. A slave node 20C receives the request message from the node 10B, adds the requester station number and request message ID included in the request message to an answer message to be replied to the request message and sends this message to the node 10B as an answer. When the requester station number and request message ID added to the received answer message are not identical to those added to the request message, the node 10B recognizes that the answer message does not reply to the request message and is a request message that is transmitted from another master node 10A, for example.
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