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JT/T 808-2019: [Including 2021XG] GNSS for operating vehicles. General specifications for vehicle terminal communication protocol and data format
JT/T 808-2019
JT
TRANSPORT INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 03.220.20; 35.240.60
M 53
Filing No.:
Replacing JT/T 808-2011
GNSS for operating vehicles - General specifications for
vehicle terminal communication protocol and data format
[Including Amendment No.1 2021XG1]
ISSUED ON: MARCH 15, 2019
IMPLEMENTED ON: JULY 01, 2019
Issued by: Ministry of Transport of PRC
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions, abbreviations ... 6
4 Protocol basics ... 9
5 Communication connection ... 12
6 Message processing ... 13
7 Protocol classification and requirements ... 14
8 Data format ... 19
Appendix A (Normative) Communication protocol between on-board terminal
and external equipment ... 56
Appendix B (Normative) Message comparisons ... 64
Amendment No.1 ... 66
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 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.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
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 and definitions, abbreviations
3.1 Terms and definitions
The following terms and definitions apply to this document.
3.1.1
Abnormal data communication link
The format and content of each different command message body is determined by each
command, see Chapter 7 for specific requirements.
4.4.5 Check code
The calculation rule of the check code shall start from the first byte of the message
header, XOR operation with the next byte, until the end of the last byte of the message
body; the length of the check code is one byte.
5 Communication connection
5.1 Connection establishment
The daily data connection -- between the terminal and the platform -- can use TCP or
UDP. After the terminal is reset, it shall establish a connection with the platform. After
the connection is established, it will immediately send a terminal authentication
message to the platform, for authentication.
5.2 Maintenance of connection
After the connection is established and the terminal authentication is successful, the
terminal shall periodically send a terminal heartbeat message to the platform; the
platform will send a platform general response message to the terminal, after receiving
it; the sending period is specified by the terminal parameters.
5.3 Disconnection of connection
Both the platform and the terminal shall actively determine whether the connection is
disconnected.
The platform shall use the following methods, to determine whether the terminal
connection is disconnected:
- In the TCP connection mode, judge the active disconnection according to the TCP
protocol;
- A terminal with the same identity establishes a new connection, indicating that the
original connection has been disconnected;
- No message from the terminal is received, within a certain period of time.
The terminal shall use the following methods, to determine whether the connection is
disconnected:
- In the TCP connection mode, it is judged that the platform is actively disconnected
according to the TCP protocol;
When the terminal communication mode is switched to the SMS message mode, the
PDU eight-bit encoding method shall be adopted. For messages with a length exceeding
140 bytes, sub-packaging processing shall be carried out, according to the SMS service
plan.
The response, retransmission, storage mechanism of SMS messages shall meet the
requirements of 6.1. Response timeout time and number of retransmission shall be
processed, according to the relevant setting values of parameter ID0x0006 and 0x0007,
in Table 13.
7 Protocol classification and requirements
7.1 Classification
Protocols are described in functional categories. If not specified, the TCP
communication mode is used by default. See Appendix A, for the communication
protocol between the onboard terminal and the external device. See Appendix B, for the
message comparison between message names and message IDs in the protocol.
7.2 Terminal management protocol
7.2.1 Terminal registration/deregistration
When the terminal is in the unregistered state, it shall register first. After the registration
is successful, the terminal obtains the authentication code and saves it. The
authentication code can be used, when the terminal is authenticated. Before the vehicle
removes or replaces the terminal, the terminal shall perform a logout operation, to
cancel the corresponding relationship between the terminal and the vehicle.
If the terminal chooses to send terminal registration and terminal deregistration
messages, through SMS, the platform shall send a terminal registration response
through SMS, to reply to terminal registration, meanwhile send a platform general
response through SMS, to reply to terminal deregistration.
7.2.2 Terminal authentication
Registered terminals shall be authenticated, immediately after establishing a connection
with the platform. The terminal shall not send other messages, before the authentication
is successful.
The terminal shall perform authentication by sending a terminal authentication message;
the platform shall reply with a general response message of the terminal.
7.2.3 Set/query of terminal parameters
The platform sets terminal parameters, by sending a terminal parameter setting message;
the terminal replies with a general terminal response message. The platform inquires
terminal parameters, by sending an inquiry terminal parameter message; the terminal
replies with an inquiry terminal parameter response message. Terminals under different
network standards shall support some unique parameters of their respective networks.
7.2.4 Terminal control
The platform controls the terminal, by sending a terminal control message; the terminal
replies with a general terminal response message.
7.3 Position and alarm protocol
7.3.1 Position information report
The terminal periodically sends location information report messages, according to
parameter settings.
According to the parameter control, the terminal can send a position information report
message, when it judges that the vehicle is turning.
7.3.2 Location information query
The platform queries the current location information of the specified vehicle terminal,
by sending a location information query message; the terminal re...