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中文摘要：
基于CPLD设计一个转换系统，对RS232/RS485信号进行QDPSK调制，并转换成光信号，利用光纤进行传输，实现了RS232/RS485的远距离通信。通过实验测试和现场运行结果来看，本系统性能良好，可以作为一种RS232/RS485远距离通信的解决方案。
英文摘要：
In the article, a convert-system is designed base on CPLD, which modulates the RS232/RS485 sig-nal in QDPSK, and converts it to optical signal, then transmits the signal via optical fiber, so that the system achieves the long-distance communication of RS232/RS485. It can be seen from the result of the experimental test and field operating that the system has a good performance, and can be a solution of the long-distance communication of RS232/RS485.
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