The G120 is a compact 2G or 4G Cat-M1/Nb-IoT GPS tracking device with a variety of inputs and outputs to cater for the most demanding applications.

With the internal GPS and cellular antennas installation is a breeze. The internal backup battery provides alerts and tracking operations even when external power (8-45V) is removed.

The G120 is equipped with a Bluetooth v5 module, enabling it to act as a Bluetooth Gateway and is also Iridum compatible with the addition of an Iridium Edge module via the G120 wiring harness. This enables a nearly plug and play option for out of cellular coverage tracking.

Visit the product page on and view the data sheet for more specifications . This guide will help you get up and running to test the G120.

In the Box

You'll get a compact box containing the G120 and a 24 wire harness.

Setting it Up

  • SIM Card

The G120 takes the Micro 3FF SIM card. The SIM holder is on top of the main board, between the modem and GPS antennas. When handling the G120 take care not to touch the GPS antenna, to minimise the risk of damaging the sensitive GPS amplifiers with static discharge.

  • Ensure the battery and external power are disconnected to ensure the mobile data connection is not active.
  • The SIM holder is hinged - slide to unlock as marked on the holder.
  • There is a small etching on the SIM holder indicating the direction keyed corner should face - the SIM contacts should face down.

To easily get up and running:

  • The SIM should not have a PIN on it, unless you use the device specific PIN.
  • The SIM should have credit or airtime
  • Battery

The battery should be ixed to the lower half of the housing and is a LiPO 1100MHz battery pack. Do not move it. The battery plug is a three-way connector on the underside of the PCB.

  • Tilt the PCB, lifting it out of the housing. Raise the edge opposite to the SIM card. Take care to avoid touching the GPS antenna.
  • Insert the battery plug into the connector. It should only be possible in one orientation.
  • The LED on the board will light up and flash if the battery has sufficient charge. Batteries are supplied fully charged.
  • Place the PCB back into the housing. See the next section for more details

  • Housing Assembly

Once the SIM and batteries are installed and the device is online, the housing can be closed.  The lid of the housing clips into the base. No screws are required. To close the housing, line up the top and bottom parts. Push the housing together firmly.

  • Locate the PCB on the base. There are a number of fingers around the edge of the PCB that will locate it.
  • Place the lid on the base, and gently squeeze one side to engage the clips.
  • Squeeze the other side to engage the remaining clips.

The housing can be opened by prying the lid from the base using a flat screw driver. A wide screw driver will ensure the housing is not marked. 

  • Locate the slot for the screw driver on the side of the housing.
  • Insert the screw driver and twist to pry the housing apart. Be careful with the clips.

  • Device Installation

The G120 can be mounted on the asset to be tracked using screws, bolts, cable ties, or industrial adhesives. 

The high performance GPS and GSM antennas allow the device to be concealed. However, always check the GPS and GSM performance after installation.

The device is not IP67 rated, so be cautious when installing it in the engine bay or in an exposed location. See section 6 for the wiring diagram.

  • Getting Online

The battery should come pre-charged. Once you insert it, the internal LED will come on and flash. If the SIM card works and there is sufficient charge in the battery, the device will connect to the OEM Server. 

To confirm it has connected, go to and search for the serial number. The LED will flash slowly at first then when it opens a connection to the server it will flash fast. Once data is sent, it will go solid briefly and revert to flashing fast. When the device goes to sleep, the LED will switch off. If the battery is too low, use the harness to provide external power. If the LED flashes but the G120 does not connect, check the SIM is in the holder correctly and check that the SIM is working.

Harness Definition

For the full harness definition - see G120 Harness Definition

The harness is a 24 way Molex connector which plugs into the board.


For information on setting up the G120 for Bluetooth scanning - see here

Default Settings

The G120 will operate with default settings out of the box. These can be changed using the OEM Admin interface. The defaults include:

  • Hourly Heartbeats: the device will log a heartbeat record, connect to the server, and refresh its GPS data every 60 minutes.
  • Wired AND Emulated Ignition: by default, the G120 will track a trip if either the ignition wire is pulled high or movement is detected. The setting can be changed to do one or the other, or continue to use both.
  • Inputs: inputs are pulled up internally and are active low. This means you can connect pull to ground switches or contacts. 
  • Output: the output is not used by default
  •  Driver ID: read Driver ID from the DM RFID reader. No special set up required to simply read tags.

Driver ID

The G120 can read Driver ID tags from the following reader types:

  • DM RFID Reader: read 125kHz RFID tags or cards.
  • iButton Reader: read Dallas iButton tags.