Modbus

Modbus主站获取不了实际从站的数据

发布于 2019-12-04 21:21:32 浏览：2742 订阅该版

36 个回答

wwwzxddn 2019-12-05

这家伙很懒，什么也没写！

whj467467222 认证专家 2019-12-05

开源，分享，交流，共同进步

wwwzxddn 2019-12-05

这家伙很懒，什么也没写！

```
static void send_thread_entry(void *parameter)
{
    eMBMasterReqErrCode error_code = MB_MRE_NO_ERR;
    rt_uint16_t error_count = 0;
    while (1)
    {
           error_code = eMBMasterReqReadHoldingRegister(SLAVE_ADDR,          /* salve address */
                                                              MB_READ_REG_START,   /* register start address */
                                                              MB_READ_REG_NUM,                /* data to be written */
                                                              RT_WAITING_FOREVER); /* timeout */
			rt_kprintf("add1--error_code: %d \n",error_code);
			rt_kprintf("<%#x><%#x><%#x><%#x>", usMRegHoldBuf[0][1],usMRegHoldBuf[0][2],usMRegHoldBuf[0][3],usMRegHoldBuf[0][4]);
			
			
			
			  error_code = eMBMasterReqReadHoldingRegister(0x02,          /* salve address */
                                                              MB_READ_REG_START,   /* register start address */
                                                              MB_READ_REG_NUM,                /* data to be written */
                                                              RT_WAITING_FOREVER); /* timeout */
			rt_kprintf("add2--error_code: %d \n",error_code);
			rt_kprintf("<%#x><%#x><%#x><%#x>", usMRegHoldBuf[1][1],usMRegHoldBuf[1][2],usMRegHoldBuf[1][3],usMRegHoldBuf[1][4]);
			
			
			
        /* Record the number of errors */
        if (error_code != MB_MRE_NO_ERR)
        {
            error_count++;
        }
    }
}
```