| 摘要 |
PURPOSE:To reduce the scale of a central control device, by providing a numerical arithmetic device and carrying out a desired numerical arithmetic for said arithmetic device through the control of the central control device. CONSTITUTION:A numerical arithmetic device CAL is driven by a central control device CC via a trunk driving device RC and performs a numerical arithmetic according to the contents of the CC to then display the result of arithmetic on a scanner SCN. The CC reads the result of scanning of the SCN to obtain a desired numerical arithmetic result. Accordingly the CC can permit the CAL to perform a desired numerical arithmetic by a control same as a general trunk TRK without using any special interface, and thus it is unnecessary that the CC itself posses a numerical arithmetic function, and the CC only performs a process of an arithmetic result. |
