采用自检回绕思想，给出各转接电路板详细设计原理，并以离散量输入转接板设计为例给出了电路设计原理图。
Finally, the detailed principle design for each switching board was given, and the circuit schematic drawing of discrete input switching board was presented.
电子电路设计及原理图绘制。
给出了系统的框架原理图、各功能部件的硬件电路设计和软件流程图及部分源程序。
The principle of system and the design of hardware and software of function modules is preset.
并且，研究了高速电路设计所涉及的如信号完整性和电磁兼容性问题，并在其指导下根据原理图进行了PCB设计，重点攻克了低成本架构带来的布局布线困难。
Moreover, high speed circuit design such as signal integrity and electromagnetic coexist is researched and PCB is designed on schematic. PCB layout and route are mainly solved in PCB design.
并且，研究了高速电路设计所涉及的如信号完整性和电磁兼容性问题，并在其指导下根据原理图进行了PCB设计，重点攻克了低成本架构带来的布局布线困难。
Moreover, high speed circuit design such as signal integrity and electromagnetic coexist is researched and PCB is designed on schematic. PCB layout and route are mainly solved in PCB design.
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