User manual

MPTP | MPTP commands 19
4. MPTP COMMANDS
This chapter lists each MPTP command, categorized according to their usage. For each command, the
following information is given:
Roles and purpose :
First, the roles of the sender and the recipient of the command are given. CC MTT indicates that
the role of the sender is Control Centre while that of the recipient is Mobile Telematics Terminal,
and vice versa.
A brief textual description of the purpose of the command follows the role information.
Supported TWIG instruments and software versions :
For each TWIG instrument and respective software version, support for sending and/or reception of
the command is indicated.
Actions on sending and reception :
The actions of the instrument on sending and reception of the command are given individually for
each TWIG instrument.
Command format :
The format of each command is listed as a table, as described in section 3.2, with sample values
for each field in the command. The table is followed by individual descriptions for each field.
The categorization of the commands is introduced in section 2.2.
4.1. Position reporting commands
Position reporting commands are used for requesting and transmitting position information as a one-time
exchange, i.e. either by sending a request command which is then responded to by a single report
command, or by manually sending an unrequested position report.
Timing or otherwise triggering position reports is called tracking. For more information, please refer to
section 4.2.
4.1.1. Position request (?LOC)
CC MTT
The position request command can be used by a Control Centre to find out the position of a Mobile
Telematics Terminal. The terminal responds by sending a position report.