开发S7-300/400与第三方软件串口通讯软件！对自行开发上位机工控软件者是非常难得的好资料！网上很难找的！万勿错过！-Development S7-300/400 with third-party software serial communication software! Pairs of self-developed Host Computer Control Software It is very rare good information! Very difficult to fi

3个好用的串口调试工具，各具特色，支持虚拟串口调试，开发串口程序的同志不要错过哈~-3 easy to use serial debugging tools, with different features, support for virtual serial port debugging, development of serial programs comrades not to miss Ha ~

一个很实用的串口类，好东西不要错过哦，我用在项目上面的。-A very practical serial class, a good thing not to miss it.

16位CRC校验查找表法，网上比较普遍的是8位表，该程序中有罕见的4位表，亲，千万不要错过哦，赶快下载吧！-16-bit CRC lookup table method, the Internet more generally eight tables, this program has the rare four tables, pro, do not miss it, download it!