| 摘要 |
PURPOSE:To use all communication ports in a control board at the time of data transfer by providing a copying controller with a serial communication controller which exchanges data with the controlled parts of a copying machine and also transfers data in a nonvolatile memory between the control board. CONSTITUTION:The control board is provided with a master CPU 301 and a slave CPU 302, which communicate with each other by means of a dual port RAM 303 a control copying. The serial communication controller has an interruption controller 310, an operation part controller 311, etc., which are connected with each control part by an optical fiber. A backup circuit is added to a RAM 305, and machine history concerning data required for copying, the number of fed papers, energization time, etc., is stored in the RAM 305 and remains even when a main switch is truned off. Thus, data in the nonvolatile memory can be maintained without adding a new communication port even when the control board is replaced. |
