HPLC communication unit is a communication unit developed based on QJ556X series communication chip, including local communication unit, single-phase communication unit, three-phase communication unit, and type II collector, which is mainly used to realize the collection of low-voltage power line terminal meter data. It meets the State Grid's “Q/GDW 11612.1-2016 Technical Specification for Low-voltage Power Line Broadband Carrier Communication Interconnection and Intercommunication”.