本程序是自己制作的一种4位数码管模块的内部程序，该模块用于大屏上动态数据的显示，通过RS485接口为其传送待显示数据，芯片是89C2051-This program is a four to produce their own digital control module' s internal procedures, the module for large-screen display of dynamic data, transmitted through the RS485 int