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GV200 @Track Air Interface Protocol

TRACGV200AN003 – 12 –

3. Message Description

3.1. Message Format

All of the @Track Air Interface Protocol messages are composed of printable ASCII characters.

Each message has the following format:

Message format Message type

AT+GTXXX=<parameter1>,<parameter2>,…$ Command

+ACK:GTXXX,<parameter1>,<parameter2>,…$ Acknowledgement

+RESP:GTXXX,<parameter1>,<parameter2>,…$ Report

The entire message string ends with character ‘$’.

The characters ‘XXX’ identify the deferent message.

The “<parameter1>,<parameter2>,…” carry the message’s parameters. The number of parameters

is different in different messages. The ASCII character ‘,’ is used to separate the neighbouring

parameter characters. The parameter string may contain the ASCII characters:

‘0’–‘9’, ’a’–‘z’, ’A’–‘Z’.

Detailed descriptions of each message format are located in the specific message sections.

By sending Commands to the terminal, the backend server can either configure and query the

parameters of the terminal or control the terminal to perform specific actions. When the terminal

receives Commands over the air, it will reply with a corresponding Acknowledgement message.

According to the configuration of the parameters, the terminal can send Report messages to the

backend server. Please see the following figure:

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Queclink GV200 Spécifications Page 13