| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To perform system switching wherein transmission and reception data are completely match with each other for data transmission and reception by a duplex system. <P>SOLUTION: For data transmission and reception to and from a device A, a device B1 system of a master system transmits start bit data initiating transmission allocated by kinds of transmission data in the data transmission to a device B2 system of a slave device, and the device B2 system generates transmission data on the basis of the start bit data and stores the transmission data as history data, when the data transmission by the device B1 system ends in failure, the device B2 system which newly becomes a master system after system switching transmits the history data to the device A and performs data transmission thereafter. The master system device transmits transmission end bit data allocated by the kinds of the transmission data to a slave system device when the data transmission is completed, and the salve system device deletes the history data on the basis of the transmission end bit data. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
