| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to specify a fault place in each signal line. SOLUTION: This system is provided with an input/output controller with a compactor 21 for receiving a transmitted signal and detecting the presence/ absence of the abnormality at the pertinent communication line and a data transfer controller 4 having a signal switching device 57 capable of looping the testing signal back to the device 2. The controller 4 houses plural serial interface signal lines 101a to 101h respectively combined with the controller 2 and transmits the testing signal received by receiving line in a first group through a transmission line in some group. |
