最近选用有人科技的以太网转RS485模块做项目，设备真漂亮，国货之光。调通了通讯的代码，发到网上供大家参考，多多交流。

以下分别是配套的头文件与源文件：

/***************************************************************
* Copyright(C) 2023,Company All Rights Reserved (1)版权说明
*
* @file    : Net2RS485.cpp (2) 文件名
*
* @brief   :  有人科技的网络转串口的通信类 (3) 文件描述
*
* @version : 1.0 (4) 版本信息
*
* @author  : 潘智斌 (5) 创建作者
*
* @date    : 2023/12/27 星期四
*
* Details  :
***************************************************************/
#ifndef _NET2RS485_H
#define _NET2RS485_H

#ifdef _WIN32
#include <io.h>
#else
#include <unistd.h>
#endif

#include <iostream>
#include <WinSock.h>
#include <sys/types.h>
//#include <string>
#include "DataDefine.h"
using namespace std;

#pragma comment(lib,"ws2_32.lib")

#define RETURN_OK 1
#define RETURN_ERR 0

class Net2RS485
{
private:
	WORD wVersion;
	WSADATA wdSockData;
	SOCKET clientSock;
	LidarPara para;
public:
	//打开数据通道
	int Open(string &ip, int &port);
	//关闭数据通道
	int Close();
	//发送数据的接口
	int Send(char *data, int len);
	//接收数据的接口
	int Recv(char *data, int &len);
};

#endif

/***************************************************************
* Copyright(C) 2023,Company All Rights Reserved (1)版权说明
*
* @file    : Net2RS485.cpp (2) 文件名
*
* @brief   :  有人科技的网络转串口的通信类 (3) 文件描述
*
* @version : 1.0 (4) 版本信息
*
* @author  : 潘智斌 (5) 创建作者
*
* @date    : 2023/12/27 星期三
*
* Details  :
***************************************************************/

#include "Net2RS485.h"

int Net2RS485::Open(string &ip, int &port)
{
	wVersion = MAKEWORD(2, 2);

	int ret = WSAStartup(wVersion, &wdSockData);			//启动 网络
	if (0 != ret)
	{
		printf("WSAStartup() failed : error() = %d\n", WSAGetLastError());
		system("pause");
		return -1;
	}

	if (2 != HIBYTE(wdSockData.wVersion) || 2 != LOBYTE(wdSockData.wVersion))	//校验版本
	{
		printf("version error\n");
		WSACleanup();
		system("pause");
		return RETURN_ERR;
	}

	clientSock = socket(AF_INET, SOCK_STREAM, 0);
	if (INVALID_SOCKET == clientSock)
	{
		printf("socket() failed , error() = %d\n", WSAGetLastError());
		WSACleanup();
		system("pause");
		return RETURN_ERR;
	}

	SOCKADDR_IN clientAddr;
	clientAddr.sin_family = AF_INET;
	clientAddr.sin_port = htons(port);
	clientAddr.sin_addr.s_addr = inet_addr(ip.data());

	ret = connect(clientSock, (sockaddr*)&clientAddr, sizeof(clientAddr));
	if (SOCKET_ERROR == ret)
	{
		printf("connect() failed, error : %d\n", WSAGetLastError());
		closesocket(clientSock);
		WSACleanup();
		//system("pause");
		return RETURN_ERR;
	}

	return RETURN_OK;
}

int Net2RS485::Close()
{
	closesocket(clientSock);
	WSACleanup();
	return RETURN_OK;
}

int Net2RS485::Send(char *data, int len)
{
	int result = send(clientSock, data, len, 0);
	if (SOCKET_ERROR == result)
	{
		printf("send() failed, error = %d\n", WSAGetLastError());
	}
	return RETURN_OK;
}
int Net2RS485::Recv(char *data, int &len)
{

	fd_set fdRead;
	FD_ZERO(&fdRead); //初始化
	FD_SET(clientSock, &fdRead);
	timeval tv = { 1, };
	int nRet = select(fdRead.fd_count, &fdRead, NULL, NULL, &tv);
	if (nRet == 0 || nRet == SOCKET_ERROR)
	{
		return RETURN_ERR;
	}

	//判断socket是否是可以读数据了
	if (FD_ISSET(clientSock, &fdRead))
	{
		len = recv(clientSock, data, 100, 0);
		if (len == 0 || len == SOCKET_ERROR)
		{
			printf("接受数据失败 \r\n");
			return RETURN_ERR;
		}
	}

	return RETURN_OK;
}