VC6.0实现scomm串口通信，与三菱FX系列PLC实现通信，读取D寄存器中的数据，写入数据。还实现了简单的多线程。仅供参考。-VC6.0 sComm serial communications, and MITSUBISHI FX series PLC to achieve communications, read data the D register, write data. Also implemented a simple multi-threaded. For reference