modbus源程序与测试工具（包括工程建立与测试过程）

新建控制台程序->添加modebus类

配置属性-附加库->modbus->lib->debug（release版本添加release）

配置属性-附加依赖项->modbus.lib

把modbus.dll文件拷贝到可执行文件目录下

 

modbus.h 代码：

#pragma once

#include "libmodbus/modbus.h"

#include

 

class Modbus

{

public:

Modbus();

~Modbus();

int writeData(int address, int *data[100], int datacount);

int readData(int address, int *data[100], int datacount);

bool connect(std::string ip, unsigned short port, int id);

void close();

 

private:

modbus_t* mb;

unsigned short DataSend[1024];

unsigned short DataReceive[1024];

 

};

 

 

modbus.cpp代码：

#include "Modbus.h"

 

 

 

Modbus::Modbus()

{

}

 

 

Modbus::~Modbus()

{

}

 

int Modbus::writeData(int address, int *data[100], int datacount)

{

memset(DataSend, 0, 1024);

int i = 0;

for (int k = 0; k < datacount; k++)

{

unsigned int temp = (*data)[k];

unsigned short low = temp;

unsigned short high = temp >> 16;

DataSend[i] = low;

DataSend[i + 1] = high;

i = i + 2;

}

 

int error = modbus_write_registers(mb, address, datacount * 2, DataSend);

/*free(datatosend);*/

return 0;

}

 

int Modbus::readData(int address, int *data[100], int datacount)

{

memset(DataReceive, 0, 1024);

 

int error = modbus_read_registers(mb, address, datacount * 2, DataReceive);

 

/*free(datatosend);*/

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

{

unsigned int low = DataReceive[2 * i];

unsigned int high = DataReceive[2 * i + 1];

unsigned int highTemp = high << 16;

(*data)[i] = (highTemp + low);

}

 

return 0;

}

 

bool Modbus::connect(std::string ip, unsigned short port, int id)

{

const char* cip;

cip = ip.c_str(); //string to const char*

mb = modbus_new_tcp(cip, port);

modbus_set_slave(mb, id);

int ret = modbus_connect(mb);

if (ret >= 0)

{

struct timeval t;

t.tv_sec = 0;

t.tv_usec = 1000000; 

modbus_set_response_timeout(mb, (int)&t.tv_sec, (int)&t.tv_usec);

return true;

}

 

else

return false;

}

 

void Modbus::close()

{

modbus_close(mb);

}