User's Manual

DRAFT TrimTrac Locator Technical Manual 32
Unit ID
Unit Identification (ID) must be used in all communications with the TrimTrac
locator. The TrimTrac locator may be assigned a numeric ID of eight digits only
while the TrimTrac locator is connected to a provisioning module (available
separately). The default ID is set to 00000000.
The TrimTrac locator checks all incoming messages for a Unit ID and all
incoming message must include a Unit ID. If the Unit ID included in a message
sent to TrimTrac locator does not match the Unit ID configured in the TrimTrac
Device, then the message is ignored.
Checksum
The checksum field provides for a two-digit hexadecimal checksum value, which
is computed by XOR’ing all characters from the beginning of the message up to
and including the * character. The checksum is always the last element of the
message before the end-of-message delimiter.
TrimTrac Application Protocol Message Summary
The following over-the-air TrimTrac Application Protocol Messages are used to
communicate with and control the TrimTrac locator.
REPORT_POS Basic Position message
STATUS_MSG Same as REPORT_POS except no location/velocity
data
SET_APP_CONFIG Changes Application parameters
RESP_APP_CONFIG Reports current Application parameters
SET_PROV_CONFIG Changes Communication parameters
RESP_PROV_CONFIG Reports current Communication parameters
SET_GPS_CONFIG Changes GPS parameters
RESP_GPS_CONFIG Reports current GPS parameters
QUERY_CONFIG Reports current Application, Communication or GPS
parameters as requested
Table 12, TrimTrac Application Protocol Messages
Application Message Types and Format
The TrimTrac Application Protocol messages are described in the following
sections beginning on the next page.