Standard No.:	JT/T 808-2019
English Name:	GNSS system for operational vehicles. General specifications for vehicle terminal communication protocol and data format
Chinese Name:	道路运输车辆卫星定位系统 终端通讯协议及数据格式
Chinese Classification:	M53    Radar, navigation equipment and system
Professional Classification:	JT    Professional Standard - Transport
Issued by:	Ministry of Transport
Issued on:	2019-03-15
Implemented on:	2019-7-1
Status:	superseded
Superseded by:	JT/T 808-2019/XG1-2021 GNSS system for operational vehicles—General specifications for vehicle terminal communication protocol and data format
Superseding:	JT/T 808-2011 GNSS system for operating vehicles - General specifications for vehicle terminal communication protocol and data format
Language:	English
File Format:	PDF
Word Count:	25000 words
Price(USD):	600.0
Delivery:	via email in 1 business day

GNSS for operating vehicles - General specifications for vehicle terminal communication protocol and data format 1 Scope This standard specifies the communication protocol and data format between the on-board terminal of GNSS for operating vehicles and the supervision/monitoring platform, including protocol basis, communication connection, message processing, protocol classification and requirements, and data format. This standard is applicable to the communication between the on-board terminal of GNSS for operating vehicles and the supervision/monitoring platform. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 2260 Codes for the administrative divisions of the Peoples Republic of China GB/T 19056 Vehicle travelling data recorder JT/T 697.7-2014 Basic data element of transportation information - Part 7: Basic data element of road transportation information JT/T 794 GNSS system for operating vehicles - Technical specification for vehicle terminals 3 Terms, definitions and abbreviations 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1.1 abnormal data communication link state in which the wireless communication link is disconnected or temporarily suspended (such as during a call) 3.1.2 register operation that a terminal sends a message to the platform to inform its installation on a certain vehicle 3.1.3 unregister operation that a terminal sends a message to the platform to inform its removal from the vehicle 3.1.4 authentication operation that a terminal sends a message to the platform at the time of being connected to the platform to enable the platform to verify its identity and at the same time reports the protocol version currently in use to communicate with the platform 3.1.5 location reporting strategy rules for reporting at regular time interval or certain distance or a combination of both 3.1.6 location reporting program rules for determining location reporting interval according to location reporting strategy 3.1.7 additional points report while turning rules for the terminal to send the location information reporting message when judging that the vehicle will turn. The sampling frequency shall not be less than 1Hz, and the change rate of vehicle azimuth angle shall not be less than 15°/s, and the sampling shall last at least more than 3s 3.1.8 answering strategy rules for the terminal to answer incoming calls automatically or manually 3.1.9 sms text alarm operation of sending text messages by SMS when the terminal alarms 3.1.10 multi-center connection strategy the terminal shall report the same data content to multiple central servers at the same time. For the downlink instruction operation of central servers, the terminal shall only respond to the downlink instruction of the primary server, but not to the downlink instruction of the secondary server 3.2 Abbreviations For the purposes of this document, the following abbreviations apply. ID——Identity APN——Access Point Name GZIP——a GNU free software file compression program (GNU zip) LCD——Liquid Crystal Display RSA——an asymmetric cryptography algorithm (developed by Ron Rivest, Adi Shamirh, and Len Adleman, named after them) SMS——Short Message Service TCP——Transmission Control Protocol TTS——Text To Speech UDP——User Datagram Protocol VSS——Vehicle Speed Sensor GNSS——Global Navigation Satellite System

Foreword II 1 Scope 2 Normative references 3 Terms, definitions and abbreviations 4 Protocol basis 5 Communication connection 6 Message processing 7 Protocol classification and requirements 8 Data format Annex A (Normative) Communication protocol between on-board terminal and external equipment Annex B (Normative) Table for message comparison