modbus rtu串口通信程序，用于openwrt通过串口查询数据。- modbus rtu serial communication program for openwrt query data through the serial port.

能够读取温度数据，，使用Modbus协议，对串口通信的初学者有很好的借鉴意义-Able to read the temperature data, and by using Modbus protocol serial communication for beginners have a good reference