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See Chinese contents: CJ/T 188-2004 CJ/T 188-2004: Technical requirements of utility meters data transmission
This standard specifies the requirements for the basic principles, interface form, physical performance, data link, data identification, data security, data expression format of data transmission of household metering instruments (hereinafter referred to as meters), including water meters, gas meters, heat meters. This standard is applicable to the automatic meter reading system for data exchange, between the master station and the slave station, one master and one slave, OR one master and multiple slaves.
