User's Manual

GPIO

Two GPIO pins, GP1 and GP2, are presented to the external environment on the main connector.

They are general purpose bidirectional lines capable of providing system interrupts to generate

a report or drive logic levels to external devices. These lines are 2.8V logic level and are 16V

tolerant. These pins default to input. GP1 is pulled down representing 0 when disconnected;

GP2 is pulled up representing logical 1 when disconnected. They should be asserted to a known

value if used. GP1 is intended to use for Ignition Sensing.

LED’s

Two LED status indicators are provided to verify correct installation and operation. The status

LEDs are color coded and directly convey the status of the cellular and GPS subsystems as

described in the table below. Their valid operation also indicates operational status and power.

LED

Function

Status

Red

GPS

On: GPS satellites acquired and Locked

Flash Slow: GPS satellite search is in progress

Off: No power or GPS subsystem fault

Green

Cellular

Connection

On: Indicates WWAN connection is made

Flash Slow: WWAN subsystem initialized but no connection

Flash Fast: WWAN initialization in process

Off: No power or WWAN subsystem fault

The TALON-LTE provides user control allowing the LEDs to be extinguished once installation

is verified. This feature reduces power and further conceals the TALON-LTE Tracker from

untrained parties wishing to defeat its operation.

UART

A UART port is provided for AT command and data interaction and optionally for application

specific control. The UART can also be used as an expansion port for sensors and other

peripherals

Relay Driver

A 500mA sink capable output pin is provided. This pin is meant to drive a relay coil indented

to interrupt the starter solenoid relay for the ignition circuit to a car.

Battery Monitor

The battery monitor is internal analog input scaled such that the DC value of the power input

pin to the TALON-LTE system is measured. This value is scaled to span the most significant 8

bits of the A/D and consequently covers a scale from 0 to 25.5 Volts.

Timers

Timers resident on the baseband chip generate periodic interrupts for power down wakeup,

watchdog support, report generation and other timer related functions. Report timers are

supported by related AT command and cause generation of periodic reports.