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See Chinese contents: JT/T 808-2019 JT/T 808-2019: [Including 2021XG] GNSS for operating vehicles. General specifications for vehicle terminal communication protocol and data format
This standard specifies the communication protocol and data format, between the on-board terminal of the satellite positioning system of road transport vehicles and the monitoring/monitoring platform, including protocol basis, communication connection, message processing, protocol classification and requirements, data format. This standard applies to the communication -- between the on-board terminal of the satellite positioning system of road transport vehicles and the supervision/monitoring platform.
