modbus.cpp

自己开发的

// Modbus.cpp: implementation of the CModbus class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "Modbus.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

const unsigned char m_auchCRCHi[]=
{
    0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,
    0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,
    0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,
    0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,
    0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,
    0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,
    0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,
    0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,
    0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,
    0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,
    0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,
    0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,
    0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,
    0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,
    0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,
    0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,
    0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,
    0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,
    0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,
    0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,
    0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,
    0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,
    0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,
    0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,
    0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,
    0x80,0x41,0x00,0xC1,0x81,0x40 
}
;

const unsigned char m_auchCRCLo[]=
{
    0x00,0xC0,0xC1,0x01,0xC3,0x03,0x02,0xC2,0xC6,0x06,
    0x07,0xC7,0x05,0xC5,0xC4,0x04,0xCC,0x0C,0x0D,0xCD,
    0x0F,0xCF,0xCE,0x0E,0x0A,0xCA,0xCB,0x0B,0xC9,0x09,
    0x08,0xC8,0xD8,0x18,0x19,0xD9,0x1B,0xDB,0xDA,0x1A,
    0x1E,0xDE,0xDF,0x1F,0xDD,0x1D,0x1C,0xDC,0x14,0xD4,
    0xD5,0x15,0xD7,0x17,0x16,0xD6,0xD2,0x12,0x13,0xD3,
    0x11,0xD1,0xD0,0x10,0xF0,0x30,0x31,0xF1,0x33,0xF3,
    0xF2,0x32,0x36,0xF6,0xF7,0x37,0xF5,0x35,0x34,0xF4,
    0x3C,0xFC,0xFD,0x3D,0xFF,0x3F,0x3E,0xFE,0xFA,0x3A,
    0x3B,0xFB,0x39,0xF9,0xF8,0x38,0x28,0xE8,0xE9,0x29,
    0xEB,0x2B,0x2A,0xEA,0xEE,0x2E,0x2F,0xEF,0x2D,0xED,
    0xEC,0x2C,0xE4,0x24,0x25,0xE5,0x27,0xE7,0xE6,0x26,
    0x22,0xE2,0xE3,0x23,0xE1,0x21,0x20,0xE0,0xA0,0x60,
    0x61,0xA1,0x63,0xA3,0xA2,0x62,0x66,0xA6,0xA7,0x67,
    0xA5,0x65,0x64,0xA4,0x6C,0xAC,0xAD,0x6D,0xAF,0x6F,
    0x6E,0xAE,0xAA,0x6A,0x6B,0xAB,0x69,0xA9,0xA8,0x68,
    0x78,0xB8,0xB9,0x79,0xBB,0x7B,0x7A,0xBA,0xBE,0x7E,
    0x7F,0xBF,0x7D,0xBD,0xBC,0x7C,0xB4,0x74,0x75,0xB5,
    0x77,0xB7,0xB6,0x76,0x72,0xB2,0xB3,0x73,0xB1,0x71,
    0x70,0xB0,0x50,0x90,0x91,0x51,0x93,0x53,0x52,0x92,
    0x96,0x56,0x57,0x97,0x55,0x95,0x94,0x54,0x9C,0x5C,
    0x5D,0x9D,0x5F,0x9F,0x9E,0x5E,0x5A,0x9A,0x9B,0x5B,
    0x99,0x59,0x58,0x98,0x88,0x48,0x49,0x89,0x4B,0x8B,
    0x8A,0x4A,0x4E,0x8E,0x8F,0x4F,0x8D,0x4D,0x4C,0x8C,
    0x44,0x84,0x85,0x45,0x87,0x47,0x46,0x86,0x82,0x42,
    0x43,0x83,0x41,0x81,0x80,0x40 
}
;
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CModbus::CModbus()
{

}

CModbus::~CModbus()
{
	if(IsConnected())
		DisconnectPort();
}


unsigned short CModbus::CalcCrcFast(unsigned char*puchMsg,unsigned short usDataLen)
{
    unsigned char uchCRCHi=0xFF ;
    unsigned char uchCRCLo=0xFF ;
    unsigned short uIndex ;
    
    while(usDataLen--)
    {
        uIndex=uchCRCHi^*puchMsg++;
        uchCRCHi=uchCRCLo^m_auchCRCHi[uIndex];
        uchCRCLo=m_auchCRCLo[uIndex];
    }
    return(uchCRCHi<<8|uchCRCLo);
}



////////////////////////////////////////////////////////////////////////////////////////////////////
/*1.对单个PLC操作*/
/*读一个或多个模拟量  参数：站号，开始地址， 读的数量， 返回数据变量指针  返回：－1表示CRC校验失败，－2表示无应答， 大于零表示接收数据成功*/
char CModbus::MODBUS_S_ReadMultiRegD(unsigned char rtu, unsigned short int RegAdd, unsigned short int RegCount, short int *list)
{
	unsigned short int crc16;
	unsigned short int crctmp;
	short int vartmp;
	
	unsigned char buff[256];
	memset(buff, 0x00, sizeof(buff));
	buff[0]= rtu;
	buff[1]= 0x03;
	buff[2]= (unsigned char)(RegAdd >> 8);
	buff[3]= (unsigned char)(RegAdd);
	buff[4]= (unsigned char)(RegCount >> 8);
	buff[5]= (unsigned char)RegCount;
	crc16= CalcCrcFast(buff, 6);
	buff[6]= (unsigned char)(crc16 >> 8);
	buff[7]= (unsigned char)crc16;
	
	//发送数据
	unsigned long strlen;
	if(IsConnected())
	{
		//发送数据
		strlen= WritePortData((char *)buff,8);
		if(strlen==8)
		{
			//读数据
			memset(buff, 0x00, sizeof(buff));
			Sleep(50);
			strlen= ReadPortData((char *)buff,255);
			if(strlen==0)
			{
				//无返回
				return(-2);				
			}
			else
			{
				//返回长度有效,解析接收缓冲区
				if(strlen== (3+(RegCount *2)+ 2) && buff[0]== rtu && buff[1]== 0x03)
				{
					crc16= CalcCrcFast(buff, 3+(RegCount*2));
					crctmp= buff[strlen-2];
					crctmp= crctmp << 8 | buff[strlen-1];
					if(crc16== crctmp )
					{
						for(int i=0; i< RegCount; i++)
						{
							vartmp= buff[3+(2*i)];
							vartmp= vartmp << 8;
							vartmp= vartmp | buff[3+((2*i)+1)];
							
							list[i]= vartmp;
						}								
					}
					else
					{
						return(-1);
					}
				}
				else
				{
					return(-1);
				}
			}
		}
		else
		{			
			return(-2);
		}		
	}
	else
	{
		return(-2);
	}
	
	return(1);
}


/*读一个或多个开关量  参数：站号，开始地址， 读的数量， 返回数据变量指针  返回：－1表示CRC校验失败，－2表示无应答， 大于零表示接收数据成功*/
char CModbus::MODBUS_S_ReadMultiRegM(unsigned char rtu, unsigned short int RegAdd, unsigned short int RegCount, bool *list)
{
	unsigned short int crc16;
	unsigned short int crctmp;
	
	unsigned char buff[256];
	memset(buff, 0x00, sizeof(buff));
	buff[0]= rtu;
	buff[1]= 0x01;
	buff[2]= (unsigned char)(RegAdd >> 8);
	buff[3]= (unsigned char)RegAdd;
	buff[4]= (unsigned char)(RegCount >> 8);
	buff[5]= (unsigned char)RegCount;
	crc16= CalcCrcFast(buff, 6);
	buff[6]= (unsigned char)(crc16 >> 8);
	buff[7]= (unsigned char)crc16;
	
	//发送数据
	unsigned long strlen;
	if(IsConnected())
	{
		//发送数据
		strlen= WritePortData((char *)buff,8);
		if(strlen==8)
		{
			//读数据
			memset(buff, 0x00, sizeof(buff));
			Sleep(50);
			strlen= ReadPortData( (char *)buff,sizeof(buff)-1);
			if(strlen==0)
			{
				//无返回
				return(-2);				
			}
			else
			{
				//返回长度有效,解析接收缓冲区
				if(strlen== (3+((RegCount+7)/8)+ 2) && buff[0]== rtu && buff[1]== 0x01)
				{
					crc16= CalcCrcFast(buff, 3+((RegCount +7)/8));
					crctmp= buff[strlen-2];
					crctmp= crctmp << 8 | buff[strlen-1];
					if(crc16== crctmp )
					{
						unsigned char row=0, col=0;						
						for(int i=0; i<RegCount; i++)
						{						
							row= i / 8;							
							col= i % 8;							
							list[i]= buff[3 + row] >> col & 0x01;
						}								
					}
					else
					{
						return(-1);
					}
				}
				else
				{
					return(-1);
				}
			}
		}
		else
		{			
			return(-2);
		}		
	}
	else
	{
		return(-2);
	}
	
	return(1);
}


/*写一个寄存器 参数：站号，写地址， 返回数据变量指针  返回：小于零失败，大于零表示成功*/
char CModbus::MODBUS_S_WriteSingRegD(unsigned char rtu, unsigned short int RegAdd, short int var)
{
	unsigned short int crc16;
	
	unsigned char buff[256];
	memset(buff, 0x00, sizeof(buff));
	buff[0]= rtu;
	buff[1]= 0x06;
	buff[2]= (unsigned char)(RegAdd >> 8);
	buff[3]= (unsigned char)(RegAdd);
	buff[4]= (unsigned char)(var >> 8);
	buff[5]= (unsigned char)var;
	crc16= CalcCrcFast(buff, 6);
	buff[6]= (unsigned char)(crc16 >> 8);
	buff[7]= (unsigned char)crc16;

	//发送数据
	unsigned long strlen;
	if(IsConnected())
	{
		//发送数据
		strlen= WritePortData( (char *)buff,8);
		if(strlen==8)
		{
			Sleep(50);
			strlen= ReadPortData( (char *)buff,255);
			//返回长度有效,解析接收缓冲区
			if(!(strlen== 8 && buff[0]== rtu && buff[1]== 0x06))
			{
				return(-1);
			}
		}
		else
		{			
			return(-1);
		}		
	}
	else
	{
		return(-1);
	}
	
	return(1);		
}


/*写一个线圈 参数：站号，写地址， 返回数据变量指针  返回：小于零失败，大于零表示成功*/
char CModbus::MODBUS_S_WriteSingRegM(unsigned char rtu, unsigned short int RegAdd, bool var)
{
	unsigned short int crc16;
	
	unsigned char buff[256];
	memset(buff, 0x00, sizeof(buff));
	buff[0]= rtu;
	buff[1]= 0x05;
	buff[2]= (unsigned char)(RegAdd >> 8);
	buff[3]= (unsigned char)RegAdd;
	if(var)
	{
		buff[4]= 0xff;
		buff[5]= 0x00;
	}
	else
	{
		buff[4]= 0x00;
		buff[5]= 0x00;
	}
	crc16= CalcCrcFast(buff, 6);
	buff[6]= (unsigned char)(crc16 >> 8);
	buff[7]= (unsigned char)crc16;
	
	//发送数据
	unsigned long strlen;
	if(IsConnected())
	{
		//发送数据
		Sleep(50);
		strlen= WritePortData((char *)buff,8);
		if(strlen==8)
		{
			Sleep(50);
			strlen= ReadPortData((char *)buff,255);
			//返回长度有效,解析接收缓冲区
			if(!(strlen== 8 && buff[0]== rtu && buff[1]== 0x05))
			{
				return(-1);
			}
		}
		else
		{			
			return(-1);
		}		
	}
	else
	{
		return(-1);
	}
	
	return(1);	
}