The LED(light-emitting diode) dot matrix screen is constitute of computer, data transfer unit and display unit.
大型LED（发光二极管）显示屏由计算机、数据转换单元与显示单元组成。
It USES PC to transform Chinese character interior code in the sentence to dot matrix display data and send them to LED display screen through serial device.
利用pc机将汉字语句汉字内码转换为点阵显示数据，通过串行口送给显示屏。
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