labciew做的程序可以借鉴一下！适合初学者-labciew do what procedures can draw! For beginners!

PComm Lite，非常好用的串口通讯调试软件 PComm动态链接库可以帮助您开发高效的串口通讯程序-PComm Lite, a very useful debugging serial communications software PComm dynamic link library can help you to develop efficient serial communication program

用VB编程与三菱A系列PLC通信的源码,需要编写串口通讯工程的可以参考,(VB programming with Mitsubishi A series of PLC communication source code, the need to write serial communication engineering can refer to,)