#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <sys/select.h>
#include <termios.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdbool.h>
#include <errno.h>

#define SENSOR "/dev/ttyS2"

int main()
{
	int fd,ret;
	struct	termios option;
	char	cRest[]={0xFE, 0x01, 0x0d, 0x8A, 0x80, 0x0d};
	char	cPower_On[]={0xFE, 0x01, 0x0d, 0x0A, 0x00, 0x0d};
	char	cTem[10];
	fd_set rset;
	struct timeval timeout;
	int rv;
	
	fd = open(SENSOR,O_RDWR | O_NONBLOCK);
	if(fd < 0)
	{
		perror("open()");
		return -1;
	}
	if(fd > 0)
	{
		printf("uart2 open successfully!\n");
	}
	
	/*配置串口*/
	memset(&option, 0, sizeof option);
    option.c_iflag = IGNPAR;
	option.c_cflag = B460800 | HUPCL | CS8 | CREAD | CLOCAL;
	option.c_cc[VTIME] = 0;
	option.c_cc[VMIN] = 10;
	
	ret = tcsetattr(fd, TCSANOW, &option);
	if (ret < 0) 
	{
		printf("set USART2-352 failed\n");
		return -1;
	}
	printf("USART2-352 is opened successfully! \n");

	/*配置传感器*/
	write(fd,cRest,6);
	sleep(1);
	write(fd,cPower_On,6);
    while(1)
    {
//		FD_ZERO(&rset);
//		FD_SET(fd,&rset);
//
//		timeout.tv_sec = 5;
//      timeout.tv_usec = 0;
		memset(cTem, 0, 10);
		
//		rv = select(fd+1,&rset,NULL,NULL,&timeout);
//		if(rv < 0){
//			perror("select error");
//			continue;
//			}
//		else if(rv == 0){
//			perror("select timeout");
//			continue;
//			}
//		else
//		{
			ret=read(fd,cTem,10);
			if(ret < 0)
			{
				perror("read()");
				close(fd);
				break;
			}
			if(ret > 0)
			{
				printf("read data : %s\n",cTem);
			}
		//}
    }
	
	close(fd);
	return 0;
}

这是程序，编译没问题，运行成这样