Numerical control device, and screen display and data input and output method for numerical control device

A numerical control device comprising a numerical control device body and a personal computer connected to said numerical control device body through a bus, wherein

• said personal computer comprises:
• a display circuit to generate a video signal from display contents of said personal computer;
• signal converting means comprising data storing means for receiving and storing display contents of the numerical control device body, the display contents comprising digital data, including bit map data or graphics commands;
• a data analyzing means for analyzing the digital data stored in the data storing means and generating an analogue video signal corresponding to the display contents of the numerical control device body;
• a driver for controlling the output of the video signal generated by said signal converting means;
• and
• video signal switching means for selecting whether the display contents of the personal computer are transmitted, as a video signal for display on a screen, by said display circuit to the display device body connected to said personal computer, and displayed, or whether the display contents of the numerical control device body are transmitted, as a video signal by said signal converting means to said display device, and displayed.

A numerical control device including a numerical control device body and a personal computer connected to said numerical control device body through a bus, wherein said numerical control device body comprises:

• a first data RAM which functions as a data input/output buffer between the numerical control device body and an external input/output device;
• and
• said personal computer comprises:
• a display circuit to generate a video signal from display contents of said personal computer,
• signal converting means including data storing means for receiving and storing display contents of the numerical control device body, the display contents including digital data, such as bit map data or graphics commands;
• data analyzing means for analyzing the digital data stored in the data storing means and generating an analogue video signal corresponding to the display contents of the numerical control device body;
• a second data RAM, which is connected to a microprocessor of said personal computer via an internal bus, and functions as a data input/output buffer between the personal computer and the external input/output device;
• a data input/output circuit including an interface to connect to said external input/output device, which is connected to an internal bus of said personal computer;
• and
• first input/output control means having a first data input function and a first data output function;
• wherein the first data input function includes reading data from the external input/output device by said data input/output circuit and temporarily storing the data in said second data RAM, when display contents of the personal computer are displayed on said display device, and storing the contents stored temporarily in said second data RAM in the main memory of said personal computer, and
• wherein the first data output function includes reading data stored in the main memory of said personal computer and temporarily storing the data in said second data RAM, and these temporarily stored contents are fetched to be output to said data input/output circuit, and the data is transferred to the external input/output device.