Infinite retry on parallel printer time - out 在并行打印機(jī)超時(shí)上;連續(xù)再試。
The article analyzes the development schemes of the host computer interface card , the adapter principle of the printer and reasons of selecting it . having studied signals of printer ports further , thus i determined the communication mode between the host computer and the slave computer , and designed communication circuit . the question of programming has been discussed 論文分析了上位機(jī)計(jì)算機(jī)接口卡的開發(fā)方案,并行打印機(jī)接口原理和選用它的原因,研究了打印機(jī)端口信號(hào),決定了通信聯(lián)絡(luò)方式,設(shè)計(jì)出上位機(jī)通訊硬件電路,并研究了上位機(jī)編程問題。