The terminal software mainly consists of the main program, the RF transceiver subprogram, the touch screen communication subprogram and others. Under terminal control, the master and slave control mode is selected and the **data** is transmitted via the MODBUS protocol. The touch screen triggers the SCM for a certain period of time, sends the acquisition command to the acquisition unit, and stores the received **data** in the set address for **data** processing. In the meantime, it analyzes the **data** returned from the nodes. In the case of failure, the touch screen serves as a protection and sends the alarm information to the monitoring center. See Figure 4 for the specific workflow of the terminal.  