针式打印机是将计算机送来的文字和图形信号转换成打印头的控制信号,并由这一控制信号驱动打印头内打印针的伸缩,通过打印针不断地击打色带,即可在打印纸上打出相应的文字和图形。随着打印机技术的发展,现在的针式打印机一般都自带汉字库。计算机只需将要打印的汉字国际码(两个字节)直接送至打印机,就可以进行汉字信息处理。针式打印机有两种打印方式。1、字符方式:主机在发送打印数据时,只传送字符的 ASCⅡ码,而字符的形态是从装于打印机内部的只读存贮器中发生的。字符方式可以获得较快的打印速度,是当前英文文本文件打印中最常用的方法。2图形方式:主机所传送的是经过软件编辑的图形象素的 Dot matrix printer is the computer sent text and graphics signals into print head control signals, and by this control signal to drive the print head in the print head retractable, through the print pin constantly hit the ribbon, you can print Paper printed on the corresponding text and graphics. With the development of printer technology, dot matrix printers now generally come with Chinese character library. The computer just need to print the Chinese character international code (two bytes) directly to the printer, you can Chinese information processing. Dot matrix printer has two printing methods. 1, the character mode: When the host sends the print data, only the character ASCII code is transmitted, and the character’s shape is from the read-only memory installed inside the printer. Character mode can get faster print speed, which is the most commonly used method in the current English text file printing. 2 graphics: the host is sent through the software to edit the graphics pixels