It gives comparison among some methods which are often adopted in the interfacing circuit, and introduces a chip MAX232 of level translation and its application method in detail.

对于硬件接口电路中常用的一些方法进行了简要的比较，并介绍了电平转换芯片MAX232及其应用方法。

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Finally an analytic comparison is made between those two kinds of counters in both their circuit structure and economic property, and hence the advantages of the binary-N carry counter are proved.

最后，就这两种计数器在电路结构和经济性能方面进行了分析比较，论证了二—N进制计数器的优点。

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It is suggested in this paper that a kind of contact-free circuit for comparison and control should substitute for the conventional contact one in the back-forth wrapper web position control system.

提出在卷筒包装纸进退式光电定位系统中，采用无触点（全电子式）比较判别及控制电路，替代目前常用的触．点式同类电路。

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