This paper takes the communication between SIMATIC S7-300 and the computer as an example, puts forward the new idea of the usage of Visual Basic in serial communication.
本文以VB在西门子PLCS7-300与上位机通信中的应用为例，提出了VB在串行通信中一种新的应用方法。
This paper takes the communication between SIMATIC S7-300 and the computer as an example, puts forward the new idea of the usage of Visual Basic in serial communication.
本文以VB在西门子PLCS7-300与上位机通信中的应用为例，提出了VB在串行通信中一种新的应用方法。
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