此为VB的modbus rtu协议的一段程序。-This is the VB modbus rtu protocol of a program.

VB做的生产线管理系统，跟mcgs触摸屏通过modbus TCP协议通信，数据库用access做的，已调试。-VB do the production line management system, with mcgs touch screen through modbus TCP protocol communication, access to do, has been debugging.