程序代码：

int main(void)
{
    int fd,i=0,j=0,fasong,getdata,Flag;
    unsigned char pre_sen[4]={0x01,0x84,0x00,0x43};//数据获取发送
    unsigned char pre_rec[10];
  
     

 struct termios newtio;
     
    fd=open(DATA_COM,O_RDWR); 
    if(fd==-1)
    {
        return -1;
    }
     
    bzero( &newtio, sizeof( newtio ) );//配置串口
    newtio.c_cflag  |=  CLOCAL | CREAD;
    newtio.c_cflag &= ~PARENB;
    newtio.c_cflag &= ~CSTOPB;
    newtio.c_cflag &= ~CSIZE;
    newtio.c_cflag |= CS8;
    cfsetispeed(&newtio, B9600);
    cfsetospeed(&newtio, B9600);
    newtio.c_cc[VTIME]  = 0;
    newtio.c_cc[VMIN] = 0;
     
    tcflush(fd,TCIFLUSH);
    if((tcsetattr(fd,TCSANOW,&newtio))!=0)
    {
        perror("com set error");
        return -1;
    }

 
    fasong=write(fd,pre_sen,sizeof(pre_sen));//写
    if(fasong<0){
        printf("write failed");
    }
     
    for(j=0;j<4;j++)
    printf("send:%x\n",pre_sen[j]);
    
    getdata=read(fd,pre_rec,sizeof(pre_rec));
     
    for(i=0;i<10;i++)
    printf("%x\n",pre_rec[i]);
    printf("\n%d",getdata);
     
     
    close(fd);
     
}