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See Chinese contents: CJ/T 188-2018 CJ/T 188-2018: Technical requirements of utility meters data transmission
This standard specifies the functional requirements, physical layer, data link layer, data security, application layer for data transmission of household metering instruments (hereinafter referred to as meters). This standard is applicable to the automatic reading system, for data exchange between the master station and the slave station, one master and one slave, or one master and multiple slaves.
