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BAS system (electromechanical equipment monitoring system) mainly completes the automatic monitoring, control and management of electromechanical equipment in the station, such as air conditioning unit, fresh air ventilator, supply / exhaust fan, air curtain machine, submersible sewage pump, elevator / escalator, air-cooled heat pump and other equipment. In order to better optimize the visual interface design of BAS system and improve the monitoring quality, so as to achieve the purpose of energy saving, safety and improving the management level, Nb IOT technology, oceanconnect cloud platform design and embedded technology are integrated into BAS system to realize remote supervision of data in each station and real-time control of equipment in each station to deal with emergencies. The system uses STM32 as the microcontroller to design the temperature, humidity and light control center and control node circuit. The general control center carries out duplex communication of command distribution and data reporting with multiple control nodes installed in the station through NB IOT wireless communication module networking. After the data collected through the temperature, humidity and light sensors of each node are processed by STM32 single chip microcomputer, The Nb IOT wireless communication module is uploaded to the oceanconnect cloud model designed according to the actual requirements to realize the cloud data visualization and data analysis of the general control center and node circuits. At the same time, the upper computer cloud module can directly control the air conditioning unit, ventilator, sewage pump and other equipment of the lower computers in each station, so as to realize real-time supervision and control of the site environment in each station. The experimental results show that the visual interface of the system is clear, concise, easy to operate, stable and reliable, can realize the communication analysis and control of real-time data, improve the effectiveness of field control in the station, and can quickly and automatically deal with emergencies.