| 摘要 |
PURPOSE:To realize a simple constitution with a low cost for a device which transmits and receives various types of data in a series transfer system, by comparing the contents between a transmitting/receiving register and a receiving storage register. CONSTITUTION:A center device 1 transmits the data group including the designated code of a terminal device and the data type code in a cyclic and successive way and at the same time transmits more than twice the same type of data in a cycle. For terminal devices 2A-2N, the contents of a register circuit 21 of the received data of this time and that of a register circuit 23 of the precedently received data are decided during a pause period of transmission of data if the designated code of the terminal device in the group received this time is identical with the code of the corresponding terminal device. The terminal pass the parity inspection if the received data of this time is identical with that of the corresponding terminal device. The contents of the circuit 23 is fed to output buffers 271-27n when the coincidence is obtained between the above-mentioned two contents. While, the contents of the register 23 is replaced with the contents of the register 21 when no coincidence is obtained between both contents. Then the collation is repeated for the received data. |
