The RTU-140 product is the cost-effective small M2M 4G terminal solution. This series of products is an intelligent 4G remote terminal device module with built-in high-performance 32bit computing unit for harsh industrial environments. It has 1 set of 4G modules, 1 set of GPS modules, 1 RS-485, 1 Micro SD slot and 1 Micro USB interface for setting. The RTU-140 product allows three Modbus RTU devices to be connected in series via one RS-485 interface, and the I/O and GPS data are actively transmitted to the remote M2M through 3G/4G through the custom RTU protocol. RTU Center platform. ICP DAS also provides related software software including M2M RTU Center, M2M RTU Win32 API library and OPC server for RTU devices, so that customers can quickly establish monitoring programs. In addition to the above functions, the RTU-140 also supports RTU Center related monitoring functions. It also has the function of I/O data logger, which can store I/O and GPS data in Micro SD card. The external and lithium battery connection interface is provided at the input of the power supply. After the external power supply is interrupted, the RTU-140 series can also operate for a period of time for emergency processing.