| 摘要 |
PURPOSE:To prevent a trouble of a low-order bus from exerting influence upon a high-order bus, by providing a bus repeating installation with a low-order bus monitor means and a high-order bus releasing means. CONSTITUTION:A bus monitor means 1 of a bus repeating installation IF1 starts a timer simultaneously with the end of the bus sequence of a low-order bus BS1 and monitors whether the side of a slave S1 completes the bus sequence within a prescribed time of not. If the bus sequence is completed within the prescribed time, data indicating this state is transmitted to a high-order bus releasing means 2. The high-order bus releasing means 2 releases the connection between a high-order bus BU and the low-order bus BS1 and aborts forcibly the sequence operation to the high-order bus BU. |
