User's Manual

GlobalTrak ™ GT Lite Operation and Maintenance Manual
communicate or receive GPS signals to gain access to a communication link or GPS data
through a neighboring GT Lite device.
Star Communications
ZigBee also allows the GT Lite to communicate with wireless sensor devices. The wireless
sensors allow GT Lite to talk to virtually any sensor without a need for cabling or wires. For
more information on ZigBee star communications, please consult Section XXXXXXXXX.
Transmit Power Level
Allowable ZigBee transmit power, in the 2.45GHz band, varies by country. In the U.S., the
FCC maximum is 1000 mW, ETSI (Europe) is 100 mW, and Japan is 10 mW. The upper
transmit power used in the GT Lite is to be determined, based on field tests and regulatory
constraints. The lower transmit power is to be a minimum of 1 mW.
Local Access and Monitoring
Main Serial Interface
The main serial interface provides device management, configuration, and monitoring using a
USB connection. Monitoring and local configuration is done with HyperTerminal. The
connection specifications are as follows:
Baud Rate: 115200 bps
Stop Bits: 1
Parity Bits: none
For more information on local monitoring and configuration, please consult section XXXXXX.
Device Activity Indicator
Four LED illuminating indicators are located on the case to indicate device health and status.
The LED’s are located on the PCB and visible through light pipes. The functions of the LEDs
are as follows:
USB LED (Green): Illuminated when USB connection is made.
Charging LED (Red): Illuminated when charging. When charging is complete, the LED goes
out.
Network LED (Green): While device is awake, blinking when GSM network is available, solid
when no network is available. While sleeping, the LED is off.
Status LED (Red):
Upon cold boot, additional LED blink codes are added to aid in installation and
troubleshooting. The blink codes are repeated continuously until another condition is met.
Dot = 0.5s on
Dash = 1.0s on
Space = 0.5s off
Prepared: R. Straz Date: July 25, 2007 Page 21 of
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