一个关于vb串口多线程通信的实例，可以看看。-Vb serial port on a multi-threaded communication instance, you can look at.

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

采用多线程技术,基于串口通信技术的上位机程序-Using multi thread technology, serial communication technology based on the computer program