This article mainly introduced the field busthe MODBUS correspondence protocol and some method of the VB apply in the serial communication-This article mainly introduced the field b usthe MODBUS protocol and some correspondence method of the VB apply

主要介绍Modbus-RTU规约,并在分析其通信原理的基础上,结合一个应用实例给出了VB6.0编程环境下利用MSComm通信控件实现基于该规约的工控机与数字显示表之间的串口通信编程方法。 -Serial Communication Based on Modbus Protocol with Microsoft Visual Basic