This article introduces the design and realization of four BCD encoder circuit take 8421 code as the example, this circuit draws out the BCD code connect with other circuit very conveniently.
以8421码为例介绍了4位BCD编码器电路的设计和实现，该电路引出的BCD编码接口可以很方便地与其他电路连接。
It explicates the ways of stepping motor's stepping count and speed in the control of the BCD-code dial switch, and the function of pulse distribution with the programmable soft of PLC.
详细说明了用BC D码拨盘开关控制步进电机步数和速度的方法及可编程序控制器编程软件实现脉冲分配器功能的方法。
Comparison between the two examples by calculating step by step, the characters of binary code and BCD code are show.
通过逐步计算的方法对两个实例进行了比较，并给出二进制编码和BCD编码的特点。
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