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See Chinese contents: HJ 212-2017 HJ 212-2017: Data transmission standard for online monitoring systems of pollutant
This standard applies to the data transmission between the online monitoring system of pollutants, the automatic monitoring system of the pollutant discharge process (working conditions), and the monitoring center. It specifies the transmission process as well as the format of parameter commands, interactive commands, data commands, control commands; gives the definition of code. This standard allows for expansion, but the expansion of content shall not conflict with the control commands used or retained in this standard.
