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In order to improve the problem of high difficulty and time-consuming to locate equipment faults manually, we designed a kind of LoRa wireless communication technology-based fault diagnosis device.The device has signal acquisition and fault diagnosis functions and contains four monitoring units and one master control unit, which use the STM32 system to implement the acquisition and processing of the relevant signals.The four monitoring units are located in the key components of the automatic weather station and are responsible for collecting information such as power supply signals, sensor output signals and operating status, and transmitting this information to the main control unit via LoRa technology.The main control unit summarizes and analyzes the information, combines it with its built-in integrated fault diagnostic methods to locate the exact location of the fault, and outputs the locating results via the HMI screen to assist the business staff in troubleshooting in a timely manner.Tests have shown that the device can realize the automatic determination of the fault location of automatic weather stations, which can significantly shorten the troubleshooting time consuming and improve the efficiency of equipment protection.