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C++编写台达ME300变频器串口通讯实例

article 2025/1/20 21:05:26

用C++编写台达ME300变频器串口通讯，读取变频器频率设定值，将接收的16进制数值转为十进制数值显示。
1、RS485CommDlg.h中代码

class CRS485CommDlg : public CDialog
{
// Construction
public:
	CRS485CommDlg(CWnd* pParent = NULL);	// standard constructor
int hexToDecimal(const char* hexNum);
int getDicimalByChar(char a);
int selfPow(int baseNum, int &tempRes, int exp);
}

2、RS485CommDlg.cpph中代码

// RS485CommDlg.cpp : implementation file
//

#include "stdafx.h"
#include "RS485Comm.h"
#include "RS485CommDlg.h"

#include <iostream>
#include <cstring>
#include <vector>
using namespace std;

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
CRS485CommDlg::CRS485CommDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CRS485CommDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CRS485CommDlg)
	m_disp = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CRS485CommDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CRS485CommDlg)
	DDX_Text(pDX, IDC_DISP, m_disp);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CRS485CommDlg, CDialog)
	//{{AFX_MSG_MAP(CRS485CommDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_SEND, OnSend)
	ON_BN_CLICKED(IDC_RECEIVE, OnReceive)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/
// CRS485CommDlg message handlers
HANDLE hCom;//全局变量,串口句柄
BOOL CRS485CommDlg::OnInitDialog()
{
	CDialog::OnInitDialog();
	hCom=CreateFile("COM5",// 串口名称
    GENERIC_READ|GENERIC_WRITE,//允许读和写
    0,//独占方式
    NULL,
    OPEN_EXISTING,//打开而不是创建
    FILE_ATTRIBUTE_NORMAL|FILE_FLAG_OVERLAPPED,//重叠方式
    NULL);
if(hCom==(HANDLE)-1)
{
MessageBox("打开 COM 失败!");
return FALSE;
}
SetupComm(hCom,100,100);//输入缓冲区和输出缓冲区的大小都是 100
COMMTIMEOUTS TimeOuts;
//设定读超时
TimeOuts.ReadIntervalTimeout=MAXDWORD;
TimeOuts.ReadTotalTimeoutMultiplier=0;
TimeOuts.ReadTotalTimeoutConstant=0;
//在读一次输入缓冲区的内容后读操作就立即返回,
//而不管是否读入了要求的字符.
//设定写超时
TimeOuts.WriteTotalTimeoutMultiplier=100;
TimeOuts.WriteTotalTimeoutConstant=500;
SetCommTimeouts(hCom,&TimeOuts);//设置超时
DCB dcb;
GetCommState(hCom,&dcb);
dcb.BaudRate=9600;//波特率为 9600
dcb.ByteSize=8;//每个字节有 8 位
dcb.Parity=NOPARITY;//无奇偶校验位
dcb.StopBits=ONESTOPBIT;//TWOSTOPBITS;//两个停止位
SetCommState(hCom,&dcb);
PurgeComm(hCom,PURGE_TXCLEAR|PURGE_RXCLEAR);

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CRS485CommDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

void CRS485CommDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}


HCURSOR CRS485CommDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CRS485CommDlg::OnSend() 
{
	
OVERLAPPED m_osWrite;
memset(&m_osWrite,0,sizeof(OVERLAPPED));
m_osWrite.hEvent=CreateEvent(NULL,TRUE,FALSE,NULL);
char lpOutBuffer[8];
memset(lpOutBuffer,'\0',8);

lpOutBuffer[0]='\x01';
lpOutBuffer[1]='\x03';
lpOutBuffer[2]='\x21';
lpOutBuffer[3]='\x02';
lpOutBuffer[4]='\x00';
lpOutBuffer[5]='\x02';
lpOutBuffer[6]='\x6F';
lpOutBuffer[7]='\xF7';
DWORD dwBytesWrite=8;
COMSTAT ComStat;
DWORD dwErrorFlags;
BOOL bWriteStat;
  DWORD bytesWritten;
ClearCommError(hCom,&dwErrorFlags,&ComStat);
 
 
//bWriteStat=WriteFile(hCom,lpOutBuffer,  dwBytesWrite,& dwBytesWrite,&m_osWrite);
bWriteStat=WriteFile(hCom,lpOutBuffer, sizeof(lpOutBuffer),&bytesWritten,&m_osWrite);


if(!bWriteStat)
{
if(GetLastError()==ERROR_IO_PENDING)
{
WaitForSingleObject(m_osWrite.hEvent,1000);
}
}
}

void CRS485CommDlg::OnReceive() 
{
	// TODO: Add your control notification handler code here
OVERLAPPED m_osRead;
memset(&m_osRead,0,sizeof(OVERLAPPED));
m_osRead.hEvent=CreateEvent(NULL,TRUE,FALSE,NULL);
COMSTAT ComStat;
DWORD dwErrorFlags;
char str[100];
memset(str,'\0',100);
DWORD dwBytesRead=100;//读取的字节数
 DWORD bytesRead;
BOOL bReadStat;
ClearCommError(hCom,&dwErrorFlags,&ComStat);
dwBytesRead=min(dwBytesRead,(DWORD)ComStat.cbInQue);
bReadStat=ReadFile(hCom,str,dwBytesRead,&bytesRead,&m_osRead);
CString c=str;   
if(!bReadStat)
{
if(GetLastError()==ERROR_IO_PENDING)

//GetLastError() 函数返回ERROR_IO_PENDING,表明串口正在进行读操作
{
WaitForSingleObject(m_osRead.hEvent,2000);
}
}
PurgeComm(hCom,PURGE_TXABORT|
    PURGE_RXABORT|PURGE_TXCLEAR|PURGE_RXCLEAR);
CString RecText="",str2;
for(int i=0;i<9;i++)
    {
     str2.Format("%02X ",str[i]);//将接收到的BYTE型数据转换为对应的十六进制
	 
		 str2=str2.Right(3);
		 RecText=RecText+ str2;	 
    }   
m_disp=RecText;
CString RecText1="",str21;
for( i=0;i<9;i++)
    {
     str21.Format("%02X",str[i]);//将接收到的BYTE型数据转换为对应的十六进制
	     
		 str21=str21.Right(2);
		 RecText1=RecText1+ str21;	 
    }   
SetDlgItemText(IDC_STATIC1, RecText1);

CString RecText11="",str211;
for( i=0;i<9;i++)
    {
     str211.Format("%02X",str[i]);//将接收到的BYTE型数据转换为对应的十六进制
	     
		 str211=str211.Right(2);
		 RecText11=RecText11+ str211;		 
    }  
 RecText11=RecText11.Right(12);
 RecText11=RecText11.Left(4);
 CString str4;
 SetDlgItemText(IDC_STATIC2, RecText11);
CString str5,str6;
    int res=hexToDecimal(RecText11);
    double   res1=res/100;
	str5.Format("设定频率:%.1f",res1);
	SetDlgItemText(IDC_STATIC3,str5);
UpdateData(FALSE);	
}


int CRS485CommDlg::hexToDecimal(const char* hexNum)
{
    int res = 0;
    vector<char> temp;
    for (int i = 0; hexNum[i] != NULL; i++)
    {
        temp.insert(temp.begin(), hexNum[i]);
    }
 
    for ( i = 0; i< temp.size(); i++)
    {
        int tempD = getDicimalByChar(temp.at(i));
        int tempRes = 1;
        res += tempD * selfPow(16, tempRes, i);  // pow(16, i)
    }
 
    return res;
}





int CRS485CommDlg::getDicimalByChar(char a)
{
    int res = 0;
    char b = '\0';
    if (a >= 'a' && a <= 'f')
    {
        b = a - 32;
    }
    else {
        b = a;
    }
 
    if (b >= 'A' && b <= 'F')
    {
        res = b - 55;
    }
    else if (b >= '0' && b <= '9')
    {
        res = b - 48;
    }
    else
    {
        return -1;
    }
 
    return res;
}


int  CRS485CommDlg::selfPow(int baseNum, int &tempRes, int exp)
{
    if (exp == 0)
    {
        return tempRes;
    }
    else 
    {
        tempRes = baseNum* tempRes;
        exp--;
        selfPow(baseNum, tempRes, exp);
    }
}