At present, there are many technologies used for meter reading in China, such as manual meter reading, RS485, infrared and power line carrier. Among them, RS485 and infrared meter reading technologies are relatively mature and widely used, while power line carrier meter reading can only be used in a small range. RS485 meter reading requires wiring and can only be implemented in a small range (less than 1000 meters); infrared meter reading requires manual on-site meter reading; due to the influence of technology and objective conditions of the domestic power grid, power line carrier meter reading still has many technical problems.
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