| 摘要 |
PURPOSE:To make a station use a computer exclusively in a system in which plural computers and plural stations are connected to a loop bus. CONSTITUTION:A frame transmitted by a loop bus 7 is sent to the loop bus 7 again through a receiving buffer 31 and a transmitting buffer 30. A station 8 determines whether the frame is to be entered in the station or not by a register 16A and a comparator 17A in case of the frame for a specific station or a register 16B and a comparator 17B in case of the frame for common stations. When the station 8 is used by a specific computer exclusively, a frame indicating exclusive use is sent to the station 8, which sets up the station address of the said computer on a register 16C by the frame and sets up a switching circuit 22 so as to output ''0''. Thus, if frame is not outputted from the said computer, a comparator 17C is not turned to ''1'', an AND circuit 21 does not operate and the frame is not entered. |
