用VC实现：电脑串口和PLC进行通信，修改、读取PLC各个地址内的值-With VC: PC serial port and PLC to communicate, modify, read the address of the value of each PLC

三菱FX2N系列的VC++串口通信源代码-Mitsubishi FX2N series of the vc++ serial communication source code