modbus读写器如何读取多个仪表,请各位指点一二

pkou123 2014-07-24 05:49:33

最近在修改一个modbus读写工具遇到一个问题,我要链接2个以上的仪表,并且读取数据,而这个程序本来只能读取一个,怎么修改也没办法读取2个,请教各位
我把2个主要读取的button和定时器放上来,源码在最后面



void CMy12Dlg::OnButton1() 

{

	// TODO: Add your control notification handler code here

    comconut=0;

	m_button1.EnableWindow(false);

	//显示初始化====================================================

	//CGridCtrl grid;

	UpdateData();

	grid.DeleteAllItems();

	grid.SetColumnCount(2);

	if(regnum<23)	

		grid.SetRowCount(23);

	else

		grid.SetRowCount(regnum+1);

	grid.SetItemText(0,0,"寄存器地址");

	grid.SetItemText(0,1,"寄存器值");

	//for(int i=0;i<2;i++)

	//{

	grid.SetColumnWidth(0,75);

	grid.SetColumnWidth(1,65);

	//}

	for(int i=0;i<regnum;i++)

	{

		str1.Format("%d",40000+regbegin+i);

		grid.SetItemText(i+1,0,str1);

	}

	KillTimer(1);

    //串口初始-----------------------------------------------

	if (comnew()==0)

		return;

	//===============================================================================

	//发送读取仪表系数命令===========================================================

	int ADDR[5];

	ADDR[0]=m_address;

	int len=0;

	//CModbus modbus;

	

	

	len=modbus.PackRead(out_meter,ADDR[0],regbegin-1,regnum);

	com_meter.Write(out_meter,len);

		comdata(0,len);

	//===============================================================================

	//启动定时器-----------------------------------------------------------------------

	SetTimer(1,timer,NULL);

	//UpdateData(false);

}

void CMy12Dlg::OnTimer(UINT nIDEvent) 

{

	// TODO: Add your message handler code here and/or call default

	int len=0;

    int tttt=0,tt=0;

	com_meter.Read(input_meter, 300);

	//str2=input_meter;

	for(int m=0;m<300;m++)

	{

		if(input_meter[m]!=0)

			tt=m;

	}

	tt=tt+1;

	tttt=strlen((const char*)input_meter);

	if (tt>tttt)

		tttt=tt;

	if(tttt==1)

		comdata(1,0);

    else

	comdata(1,tttt);	

	

	//CModbus modbus;

//	len=modbus.PackRead(out_meter,m_address,regbegin-1,regnum);



	int ADDR[5];

	ADDR[0]=m_address;

	ADDR[1]=m_address2;

	

		len=modbus.PackRead(out_meter,ADDR[0],regbegin-1,regnum);

		com_meter.Write(out_meter,len);

	comdata(0,len);

	if(modbus.UnpackRead(input_meter,value))

	{

		for(int m=0;m<regnum;m++)

		{

				str1.Format("%d",value[m]);

			//	grid.SetItemText(m+1,1,str1);

			switch (m+1)

			{

			case 1:

				SetDlgItemText(IDC_EDIT7,str1);

			case 2:

				SetDlgItemText(IDC_EDIT8,str1);

			case 3:

				SetDlgItemText(IDC_EDIT9,str1);

			case 4:

				SetDlgItemText(IDC_EDIT13,str1);

			case 6:

				SetDlgItemText(IDC_EDIT14,str1);

			case 8:

				SetDlgItemText(IDC_EDIT15,str1);



				break;



				

			}

		

	}

//	len=modbus.PackRead(out_meter,m_address,regbegin-1,regnum);

 //   com_meter.Write(out_meter,len);

//	comdata(0,len);

//	if(modbus.UnpackReadA(input_meter,value))

	

	}

//	grid.Refresh();

    //KillTimer(1);

	CDialog::OnTimer(nIDEvent);

}

本想着是把程序里面涉及到设备地址的地方copy一份,然后放入另一个设备的地址,但是这样行不通,直接就无法读取了
本来是加入以下代码

len=modbus.PackRead(out_meter,ADDR[1],regbegin-1,regnum); //ADDR[0]是第一个仪表地址,ADDR[1]是第二个仪表地址

		com_meter.Write(out_meter,len);

但是无法获取到数据,请各位大神指教一下,

就是在读取一个仪表的基础上修改成读取2个,

以下是部分定义

int CModbus::PackRead(LPBYTE pBuffer, int iAddress, int iBegin, int iCount)

{

	pBuffer[0] = iAddress;

	pBuffer[1] = 0x03;

	pBuffer[2] = HIBYTE(iBegin);

	pBuffer[3] = LOBYTE(iBegin);

	pBuffer[4] = HIBYTE(iCount);

	pBuffer[5] = LOBYTE(iCount);

	*(WORD*)(pBuffer + 6) = Check_CRC(pBuffer, 6);

	return 8;

}



DWORD CCom::Write(LPVOID lpBuffer, DWORD dwNumberOfBytesToWrite, bool bRTS)

{

	if (!IsOpen())

		return 0;



	if (bRTS)

		SetRts(true);



	PurgeComm(m_hCom, 

		PURGE_TXABORT | PURGE_RXABORT | PURGE_TXCLEAR | PURGE_RXCLEAR);



	DWORD dwNumberOfBytesWrite = 0;

	if (!WriteFile(m_hCom, lpBuffer, dwNumberOfBytesToWrite, &dwNumberOfBytesWrite, NULL))

	{

		DWORD dwErrors;

		COMSTAT Stat;

		ClearCommError(m_hCom, &dwErrors, &Stat);

		dwNumberOfBytesWrite = 0;

	}



	if (bRTS)

	{

		Sleep(10);

		SetRts(false);

	}

	

	return dwNumberOfBytesWrite;

}



bool CModbus::UnpackRead(LPBYTE pBuffer, int *pValue)

{

	if (*(WORD*)(pBuffer + pBuffer[2] + 3) != Check_CRC(pBuffer, pBuffer[2] + 3))

		return false;

	for (int i = 0; i < pBuffer[2] / 2; i++)

		pValue[i] = MAKEWORD(pBuffer[4 + i * 2], pBuffer[3 + i * 2]);

	return true;

}