该文详细论述了在Powerbuilder8.0开发环境中利用Mscomm32.ocx控件来实现上位机PC与PLC的串口通信，并分别介绍了Mscomm32.ocx控件的属性、事件以及使用方法。同时，该文也给出了下位机FX2N系列PLC的通信机制以及应该注意的问题。关键词：Powerbuilder8.0;Mscomm32.ocx控件；PLCAbstract: In this article, we had discussed the method to accomplish the serial communication between PC and PLC by the Mscomm32.ocx control in the environment of Powerbuilder8.0 in detail, and we had also introduced differently the property, incidence of the Mscomm32.ocx control and its usage. At the same time, we had explained the principle of communication of FX2N which belonged to the PLC and the notice.Keywords: Powerbuilder8.0; Mscomm32.ocx control; PLC
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