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 0class 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;
}