基于MODBUS的上位机软件,用VC++实现与单片机的通讯-Based on MODBUS of the host computer software, using VC++ to achieve the communication with the MCU

vc程序与modbus进行通讯源码， 可以与plc控制的下位机通讯，可以了解到通讯编码规则-vc program source code to communicate with modbus, plc control with the next bit machine communications, coding rules can understand communication