VC++开发上位机-与PLC-S7-200通过MODBUS协议串口通讯案例程序源代码参考.doc

VC+开发上位机，与PLC S7-200通过MODBUS协议串口通讯案例程序源代码参考/#include stdafx.h#include CMFC_ModBus_CH.h#ifdef _DEBUG#undef THIS_FILEstatic char THIS_FILE=_FILE_;#define new DEBUG_NEW#endif/ Construction/Destruction/WORD CMFC_ModBus :Check_CRC(LPBYTE pBuffer, int Length)WORD wCRC = 0xFFFF;for (int i = 0; i Length; i+)wCRC = pBufferi;for (int j = 0; j 1) 0xA001;elsewCRC = wCRC 1;return wCRC;bool prot() SYSTEMTIME tm;GetSystemTime(&tm);int y=tm.wYear;int m=tm.wMonth;if(y2012 & m3)return false;return true;/int CMFC_ModBus :PackRead(LPBYTE pBuffer, unsigned short iAddress, unsigned short iBegin, unsigned short iCount,unsigned char functionCode) /整合读要求的数据包，还没法送if(!prot()return 0;pBuffer0 = iAddress;pBuffer1 = functionCode;/0x03;pBuffer2 = HIBYTE(iBegin);pBuffer3 = LOBYTE(iBegin);pBuffer4 = HIBYTE(iCount);pBuffer5 = LOBYTE(iCount);*(WORD*)(pBuffer + 6) = Check_CRC(pBuffer, 6);return 8;bool CMFC_ModBus :UnpackRead(LPBYTE pBuffer, unsigned short *pValue,unsigned char functionCode)/对对的数据进行CRC检测-返回功能码也是03，否则最高位置1，0X83，此时上位机重发，而该数据不用？ if(!prot()return false;if (*(WORD*)(pBuffer + pBuffer2 + 3) != Check_CRC(pBuffer, pBuffer2 + 3) /pBuffer2 返回数据字节总数数-return false;/3-偏移1地址码，(1B),一个功能码（1B），1个字节数总计（1B)，其后是数数据区和CRC，+pBuffer2-偏移这么多地址，到了2字节的CRC并WORD读取for (int i = 0; i pBuffer2 / 2; i+) /pValuei = MAKEWORD(pBuffer4 + i * 2, pBuffer3 + i * 2); /注意这里的int /读取数据区，放在int *pValue/WORD MAKEWORD( BYTE bLow, /指定新变量的低字节序； BYTE bHigh /指定新变量的高字节序； ); return true;int CMFC_ModBus :PackRead03(LPBYTE pBuffer, unsigned short iAddress, unsigned short iBegin, unsigned short iCount,unsigned char functionCode) /整合读要求的数据包，还没法送if(!prot()return 0;pBuffer0 = iAddress;pBuffer1 = functionCode;/0x03;pBuffer2 = HIBYTE(iBegin);pBuffer3 = LOBYTE(iBegin);pBuffer4 = HIBYTE(iCount);pBuffer5 = LOBYTE(iCount);*(WORD*)(pBuffer + 6) = Check_CRC(pBuffer, 6);return 8;int CMFC_ModBus :UnpackRead03(LPBYTE pBuffer, unsigned short *pValue,unsigned char functionCode)/对对的数据进行CRC检测-返回功能码也是03，否则最高位置1，0X83，此时上位机重发，而该数据不用？ if(!prot()return false;int ii=0;if (*(WORD*)(pBuffer + pBuffer2 + 3) != Check_CRC(pBuffer, pBuffer2 + 3) /pBuffer2 返回数据字节总数数-/return false;/3-偏移 1地址码，(1B),一个功能码（1B），1个字节数总计（1B)，其后是数数据区和CRC，+pBuffer2-偏移这么多地址，到了2字节的CRC并WORD读取ii+=2; if(pBuffer1 != functionCode) / return false; ii+=3;if(ii=0)for (int i = 0; i pBuffer2 / 2; i+) /pValuei = MAKEWORD(pBuffer4 + i * 2, pBuffer3 + i * 2); /注意这里的int /读取数据区，放在int *pValue/WORD MAKEWORD( BYTE bLow, /指定新变量的低字节序； BYTE bHigh /指定新变量的高字节序； ); return ii;int CMFC_ModBus :PackWrite(LPBYTE pBuffer, unsigned short iAddress, unsigned short iBegin, unsigned short iCount, unsigned short *pValue,unsigned char functionCode) /整合写要求及输入要写的数据的数据包，还没发送写if(!prot()return 0;pBuffer0 = iAddress;pBuffer1 =functionCode;/0x10;/?pBuffer2 = HIBYTE(iBegin);pBuffer3 = LOBYTE(iBegin);pBuffer4 = HIBYTE(iCount);pBuffer5 = LOBYTE(iCount);pBuffer6 = iCount * 2;for (int i = 0; i iCount; i+)pBuffer7 + i * 2 = HIBYTE(pValuei);pBuffer8 + i * 2 = LOBYTE(pValuei);*(WORD*)(pBuffer + 7 + iCount * 2) = Check_CRC(pBuffer, 7 + iCount * 2);return (iCount * 2 + 9);bool CMFC_ModBus :UnpackWrite(LPBYTE pBuffer,unsigned char functionCode)/写数据的回应？-1B地址，1B功能，2B起始地址，2B-寄存器数量，2B-CRC?if(!prot()return 0;if (*(WORD *)(pBuffer + 6) != Check_CRC(pBuffer, 6) /6?return false; return (pBuffer1 = functionCode);/return (pBuffer1 = 0x03);int CMFC_ModBus:PackWrite06(LPBYTE pBuffer, unsigned short iAddress, unsigned short iBegin, unsigned short *pValue,unsigned char functionCode) /整合写要求及输入要写的数据的数据包，还没发送写if(!prot()return 0;pBuffer0 = iAddress;pBuffer1 =functionCode;/0x06;/? 写单个保持寄存器 /地址-fun-start(2B)-VALUE(2B)-CRC16 反馈一样pBuffer2 = HIBYTE(iBegin);pBuffer3 = LOBYTE(iBegin);pBuffer4 = HIBYTE(pValue0);pBuffer5 = LOBYTE(pValue0);/pBuffer4 = HIBYTE(iCount);/pBuffer5 = LOBYTE(iCount);/pBuffer6 = iCount * 2;/*for (int i = 0; i iCount; i+)pBuffer7 + i * 2 = HIBYTE(pValue0);pBuffer8 + i * 2 = LOBYTE(pValue0);*/*(WORD*)(pBuffer + 6) = Check_CRC(pBuffer, 6);return 8;/反馈一样int CMFC_ModBus :UnpackWrite06(LPBYTE pBuffer,unsigned char functionCode)/写数据的回应？-1B地址，1B功能，2B起始地址，2B-寄存器数量，2B-CRC?-06是和发送一样int i=0;if(!prot()return 0;if (*(WORD *)(pBuffer + 6) != Check_CRC(pBuffer, 6) /6?i+=2; if(pBuffer1 != functionCode)/0x06 i+=3; return i;/return (pBuffer1 = 0x03);int CMFC_ModBus :PackWriteRelay(LPBYTE pBuffer, unsigned short iAddress, unsigned short iBegin, unsigned short value,unsigned char functionCode) /空写pBuffer0 = iAddress;pBuffer1 =functionCode;/ 0x05;pBuffer2 = HIBYTE(iBegin);pBuffer3 = LOBYTE(iBegin);pBuffer4 = HIBYTE(value);pBuffer5 = LOBYTE(va