User Manual
www.geolink.io 
2  OpenTracker 2  User Manual (1.3) 
Table of Contents 
Introduction ...................................................................................................................................................... 4 
Hardware Introduction .................................................................................................................................... 5 
Board Overview .............................................................................................................................................. 5 
Processor ....................................................................................................................................................... 5 
Modem ........................................................................................................................................................... 5 
GPS Module ................................................................................................................................................... 6 
Quick Start Guide ............................................................................................................................................ 7 
Install Arduino IDE ......................................................................................................................................... 7 
Insert SIM Card .............................................................................................................................................. 7 
Connect Antennas .......................................................................................................................................... 7 
Connect USB Cable ....................................................................................................................................... 8 
Connect MOLEX Cable .................................................................................................................................. 8 
Connect Power source ................................................................................................................................... 9 
Start up the tracker ......................................................................................................................................... 9 
Setup APN ................................................................................................................................................. 9 
Change SMS password ........................................................................................................................... 10 
SMS Commands ...................................................................................................................................... 11 
Register .................................................................................................................................................... 11 
External I/O ..................................................................................................................................................... 12 
Main Connector Type ................................................................................................................................... 12 
Main Connector Pin assignment .................................................................................................................. 12 
CAN BUS Interface ...................................................................................................................................... 12 
Using CAN ............................................................................................................................................... 12 
Open Collectors (relay connection) .............................................................................................................. 13 
Using the Relay outputs (OUT1 / OUT2) ................................................................................................. 14 
Inputs............................................................................................................................................................ 15 
Using the Inputs (IN1 / IN2) ..................................................................................................................... 15 
Voltage detection VDET (ignition detection) ................................................................................................ 17 
Using Ignition detection (VDET) .............................................................................................................. 17 
Battery monitoring (AIN_S_INLEVEL) ......................................................................................................... 18 
Using Battery Monitoring ......................................................................................................................... 18 
Customizable EXT PIN ................................................................................................................................ 19 
Using EXT PIN ......................................................................................................................................... 19 
Example usage - One Wire ...................................................................................................................... 19 
LEDs ................................................................................................................................................................ 20 
Using the LEDs ............................................................................................................................................ 20 
PWR LED (red) ........................................................................................................................................ 20 
NET LED (green) ..................................................................................................................................... 20 
Internal I/O ...................................................................................................................................................... 21 
Schematic ................................................................................................................................................ 21 
USB Interface ................................................................................................................................................. 22 
JTAG Interface ............................................................................................................................................... 23 
Schematic ................................................................................................................................................ 23 
Software .......................................................................................................................................................... 24 










