Professional GPS Tracker 4G FMC125 with RS232, RS485 and dual SIM

For demanding fleets: tachograph, temperature readers, Iridium satellite and dual SIM in a single device.

The FMC125 is the 4G GPS tracker in Teltonika's Professional range, designed for projects that require connectivity with advanced external peripherals. The RS232 and RS485 ports allow integration with tachograph card readers, cold-chain thermometers, barcode readers, portable printers or any serial peripheral your operation needs.

The dual SIM is key for fleets that cross borders or work in areas with patchy coverage: if one carrier fails, the device automatically switches to the second without losing a single datapoint. Also compatible with Iridium satellite communication modules for areas without 4G coverage.

Supports video telematics when combined with Teltonika cameras (Dashcam, DualCam), which lets you see what is happening in the cabin or on the road in response to a harsh driving event or accident.

Compatible with the CAN-CONTROL adapter and with accessories from the EYE range. IP41 with NiMH backup battery sized to alert on power loss. If you have a complex use case, the FMC125 solves it without needing several devices.

Key features

• RS232 + RS485: direct connection with tachographs, temperature sensors and serial peripherals
• Dual SIM with automatic switchover for continuous coverage across Europe
• Compatible with the Iridium satellite module for areas without 4G
• Video telematics support with Teltonika cameras (Dashcam, DualCam, DSM)
• Compatible with CAN-CONTROL for remote vehicle control
• Bluetooth 4.0 for EYE external sensors and accessories
• 3 digital inputs + 3 digital outputs, 12-pin connector

Use cases

1. Refrigerated transport in Catalonia — log cold-chamber temperature throughout the journey and comply with cold-chain regulations. FMC125 + RS232 sensor records temperature and GPS position in real time.
2. International transport on Spain-France-Germany routes — continuous coverage without changing SIMs. FMC125 with dual SIM automatically switches to the carrier with the best signal on each leg.
3. Distribution trucks in Madrid with built-in DualCam cameras — cabin recording triggered automatically on hard braking or accidents, with remote access to the video from the platform.

If you have questions about peripheral or platform compatibility, ask us before ordering. We ship from Spain in 3-5 business days.

Related technical documentation

• Which model do I need? — selector by use type (light vehicle / truck / asset / motorcycle / construction).
• FOTA · Remote firmware update — how to manage device firmware remotely from the Teltonika console.
• Codec 8 / 8E / 16 protocol — binary reference, tested integrations (Traccar, Wialon, Flespi, Fleet Complete) and notes for your own parser.
• Warranty and RMA process — 3-year legal coverage + 24-month Teltonika commercial warranty.