| 摘要 |
PURPOSE:To simply perform a switching job of input/output devices at a high speed by applying the switch control to the connecting state between a channel device and a channel connecting part based on the switch information and the non-communication state information regardless of the presence or absence of the data or a status to be transferred. CONSTITUTION:A switch informing part 4 delivers the switch information to indicate a valid or invalid state of a path between a channel connecting part 2 and a channel device 1. A channel interface control part 5 delivers the non- communication state information showing that the data or a status is not under a transfer state regardless of the presence or absence of the data or the status to be transferred. Then a switch control part 6 switches a path between the part 2 and the device 1 to an invalid state from a valid state and vice versa based on the switch information and the non-communication state information. Thus the switching action is carried out quickly. At the same time, it is possible to perform a switching action between an input/output device and a host computer an also to load a program to the input/output device from the host computer with high efficiency. |
