本文介绍了VB 进行串口通信的各种基本方式和三菱可编程控制器之间的通信的程序设计，重点介绍了利用MSCOMM.OCX进行串行通信的设计方法。-This article describes the various serial communication VB basic methods and Mitsubishi programmable logic controller communication between the program design, focuses on serial communication using MSCOMM.OCX design.