User's Manual

DRAFT TrimTrac Locator Technical Manual 14
it commands to direct it to report to a different location or start reporting at a
different rate.
Configuration Security
The configurable parameters are divided into two groups, the read/write group
and the provisioning group.
• The provisioning group includes parameters that are only read from once
the TrimTrac locator enters normal usage. They are set at either time of
manufacturing or possibly time of provisioning. Some are never written
only read from. The values such as the Unit ID and Firmware Version are
written at time of manufacturing. The Destination Address is written at
time of provisioning or can be changed over the air using the
SET_PROV_CONFIG message. The battery status values are updated by
the firmware and only read from by the user.
• The read/write group includes operational parameters that are changed as a
part of the normal operation of the TrimTrac locator. Sending a TrimTrac
Application message to the TrimTrac locator over the air could change all
these values. Using these messages the server application can change the
functionality of the TrimTrac locator. The communication security
methods will protect these values from being changed by an unauthorized
user.
The SIM PIN is a feature of GSM SIMs that allows the owner of the SIM to put a
lock on the SIM. In order to use the account associated with the SIM, the user of
the GSM device must provide the SIM PIN after SIM insertion of device power
up. The SIM PIN setting in the firmware is a storage location to keep the SIM
PIN to be used if the SIM asks for one. If asked for, the SIM PIN is used to
attempt to unlock the SIM. If the unlock fails the SIM PIN is marked as having
cause a failure and not retried until the user physically connects the TrimTrac
locator to a provisioning module and issues a new AT command changing the
SIM PIN. This is to prevent the SIM from becoming unusable after 10 SIM PIN
failures. The SIM PIN cannot be read back once set. It can only be overwritten.
Diagnostics
When the Diagnostics Mode is enabled and set to 1 (LED) the LED on the
TrimTrac locator will blink at different rates depending on the TrimTrac locator’s
operational state. If the TrimTrac locator is powered off the LED is off. If the
estimated battery life is below the threshold of 10% the LED is turned on
continuously while the TrimTrac locator is operational and not blinked. Only if
the batteries are good will the following blinking rates apply:
IDLE: 250ms ON / 250 ms OFF.
FIX: 2000ms ON / 2000 ms OFF.
TRANSMIT: 200ms ON / 1800ms OFF