User's Manual

DRAFT TrimTrac Locator Technical Manual 30
TrimTrac Application Protocol
Introduction
The TrimTrac Application Protocol is used to communicate with and control
TrimTrac locators that have already been provisioned and deployed to the field.
The TrimTrac locator commutes with the server application by sending and
receiving SMS messages based on an ASCII-like protocol (in lieu of the
AT+commands used during initial provisioning). This TrimTrac Application
Protocol uses the same message structure as the Trimble ASCII Interface Protocol
(TAIP) even though no TAIP messages defined for Trimble products other than
the TrimTrac locator are used. It is used to communicate with and control
TrimTrac locators that have already been provisioned and deployed to the field.
For security reasons, the only parameters that cannot be changed over-the-air
using the TrimTrac Application Protocol are the Unit Identification number, SIM
PIN and Security Password.
Message Format
Basic Message
All TrimTrac Application Protocol messages use printable ASCII characters.
Upper case and lower case alpha characters are generally interchangeable, i.e.,
lower case characters are converted to upper case alpha in the TrimTrac locator
before parsing.
Each message has the following general format with the contents of the data
string being message dependant. Valid messages are limited to 128 characters.
>ABB{C}[;PW=PPPPPPPP];ID=YYYYYYYY;*ZZ<
Element Meaning
> Start of new message
< End of message
A Message Qualifier (Q, R, or S)
BB 2-character Message Identifier (Must be TK)
C Data string.
PPPPPPPP Security Password. Always 8 digits. Default
00000000
YYYYYYYY Unit ID. Unique unit identifier. Always 8 digits.
Default 00000000
ZZ 2-character checksum.