| 摘要 |
PURPOSE: To reduce time for inspecting a system by constituting a device selection module to select one of second scanning lines and to completely bypass the second scanning line of a previously fixed circuit concerning a circuit respectively and previously fixed by a bus master. CONSTITUTION: Each device selection module 18 of a circuit board 16 are constituted to select one of scanning lines 1 to (m) on the circuit board 16 of their each by the bus master 12 or to completely bypass the second scanning line. By selection a second scanning line on a first scanning line or not selecting it, the whole length of the first scanning line can be made in a necessary length so as to include only a necessary scanning line during a specific scanning operation. Time necessary for scanning data through the first and second scanning lines specified by a user is reduced by this performance. |
