LABWINDOWS CVI进行Modbus Tcp通信

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int  client_socket；
int connectPlc(char *ip, int port)
{unsigned char response[1024];int register_value = 0;int closePortErr = 0;int openPortErr = 0;int commPortErr = 0;WORD wVersionRequested;WSADATA wsaData;struct sockaddr_in server_addr;wVersionRequested = MAKEWORD(2, 1);openPortErr = WSAStartup( wVersionRequested, &wsaData);client_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);if (client_socket < 0){return 0;}memset(&server_addr, 0, sizeof(server_addr));server_addr.sin_family = AF_INET;server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");server_addr.sin_port = htons(502);openPortErr = connect(client_socket, (struct sockaddr*)&server_addr, sizeof(server_addr));if (openPortErr){WSACleanup();return -1;}else{return 0; 	}return 0;
}int sendPlc()
{unsigned char request[12] ={0x00, 0x01, // 事务标识符0x00, 0x00, // 协议标识符

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