| 摘要 |
PURPOSE:To share a console with plural units of CPU, by using a changeover switch containing a CPU selecting function of a switch device and a switch circuit for connection between a specific CPU and the console. CONSTITUTION:When data are delivered from plural units of CPU 1, the data of the CPU 1 which is first delivered is printed by a printer 5 regardless of the designation of a changeover switch 7 containing a CPU selecting function. In this case, if a data output request is given from another CPU 1, a switch device 3 sends a busy signal back to the corresponding CPU 1. After the data is printed, the device 3 searches a data output request through a switch circuit 6 and then sends the data to the printer 5 via a printer control part 8 if a data output request is given. Thus the data is printed. When the input and output of data are carried out exclusively between a specific CPU 1 and a console 4, the specific CPU 1 is selected first by the output of the switch 7. Then this selected CPU 1 is electrically connected to the console 4 with 1:1 correspondence through the circuit 6. |
