User's Manual

DRAFT TrimTrac 1.5 Technical Manual v0.3ab 103
up. The SIM PIN setting is stored in the firmware and is used if the SIM requests
it. If so requested, the SIM PIN is used to attempt to unlock the SIM. If the
unlock fails, the SIM PIN is marked as having caused a failure and not retried
until the user physically connects the TrimTrac 1.5 to a Provisioning Module and
uses the AT+CKTP command to change 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.
Configuration Security
The configurable parameters are divided into two groups, the provisioning group
and the read/write group.
The provisioning group includes parameters that can only be read, but not
changed. They are set at time of manufacturing or, in some cases, at time of
provisioning. The values such as the IMEI Number and Firmware Version are
written at time of manufacturing. The SMS Destination Address is written at time
of provisioning or can be changed over the air using the SET_PROV_CONFIG
message.
The read/write group depicted in Table 91, Read-only Parameters on page 159
includes operational parameters that are changed as a part of the normal operation
of the TrimTrac 1.5. Sending a TrimTrac Application message to the TrimTrac
1.5 via the GSM network can change all these values. Using these messages the
server application can change the functionality of the TrimTrac 1.5. The
communication security methods will protect these values from being changed by
an unauthorized user.
Diagnostics
When the Diagnostics Mode is enabled and set to 1 (LED) the LED on the
TrimTrac 1.5 will blink at different rates depending on the TrimTrac 1.5’s
operational state. If the TrimTrac 1.5 is powered off the LED is off. Once the
battery charge drops to 10% or below, the LED remains on in all states except the
DELAY State when the LED is turned off. Please see Table 42 for a full
description of LED blink rates.