| 摘要 |
PURPOSE:To minimize the fault restoration time by allowing all terminal devices and a transmission master station to detect individually a fault of each terminal device and a transmission line so as to discriminate easily the faulty location. CONSTITUTION:A transmission/reception control section B receives a data from a transmission line A and transmits the received data in a reception buffer E. The control section B checks the data for reception error or parity check, and if a fault is found out, it is registered at each error kind in an error message file Q to abolish the data. The address is decoded by the buffer E, a transmission station of the reception data is discriminated, the result is stored in a reception history register D and the transmission data is stored in an arithmetic control unit I. Further, a print data fed to the unit I is transferred to a transmission buffer H at each prescribed period, the own station address is added, the transmission data is transferred to the control section B to check and process similarly various errors as the case with the reception data. Then troubleshooting of the fault of the transmission line is attained easily. |
