The software composition of each node is rather complex. There are parts like the main program, display and temperature acquisition subprogram, radio frequency subprogram, etc. During the operation, the master node initializes JTT4432 and sets the signal acquisition frequency; then, it starts to collect temperature signals, preprocesses the **data** at the same time, and displays the results on the interface. The monitoring terminal sends the signals to the control terminal. Figure 3 depicts the workflow of the main program.