| 摘要 |
A communication control apparatus is constituted such that, when functioning as a receiving side, an IFR 20 is replied only when receiving normally or only when not receiving normally, also at the time of multiple address communication, when functioning as the receiving side, the IFR 20 is replied only when receiving normally or only when not receiving normally, and furthermore, at the time of multiple address communication, a reply data row is replied only when an IFR control code 57 sent from a transmitting side is larger than respective source addresses, or only when smaller. It is possible to find out occurrence of errors in a unit on the transmitting side, by one frame communication, and accuracy of the multiple address communication is improved, besides the source address of the unit having an unspecific source address can be retrieved easily in one specific unit.
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