Teltonika FMB125 - Professional Tracker (RS232 / RS485)
Professional GNSS/GSM/Bluetooth® tracker with external GNSS, internal GSM antennas, RS232 and RS485.
Product Details
The FMB125 is the serial-interface model: RS232 and RS485 ports let it talk to fuel-level probes, tachographs, printers, weighing systems and other industrial peripherals that the rest of the range cannot reach. An external GNSS antenna connector helps where the body shell blocks the sky.
FleetStack Advantage
Get on-trip and off-trip vehicle distance covered
Monitor deviated distance, time, and number of vehicle trips
Analyse aggressive driving behaviour, including overspeeding, harsh braking, acceleration, and cornering
Detect towing events with alerts
Track driver performance, incident summary, top drivers, and much more
Prevent vehicle theft with geofencing
Manage the maintenance of the vehicles efficiently and on time
Create and manage trips on the move
Key Features
RS232 and RS485 serial ports for fuel probes, tachographs and printers.
External GNSS antenna connector for difficult vehicle bodies.
The only model in this group with industrial serial interfaces.
170 mAh backup battery for power-cut reporting.
General Information
- Product Type
- Professional Tracker (RS232 / RS485)
- Manufacturer
- Teltonika Telematics
- Country of Origin
- Lithuania
- Weight
- 52 g
- Operating Temperature
- -40 °C to +85 °C
- Operating Humidity
- 5% to 95% non-condensing
Network and Connectivity
- Network
- 2G (GSM/GPRS), GNSS, Bluetooth
- Interfaces
- RS232, RS485, digital inputs/outputs, analog input, 1-Wire
Power
- Power Supply
- 10 - 30 V, 1 A max
- Built-in Battery
- 170 mAh Li-ion (3.75–3.90 V)
Server Connection
- Server Host
- Issued with your FleetStack account credentials
- Server Port
- 5027
- Protocol
- Teltonika (Codec 8 / Codec 8 Extended / Codec JSON)
Supported Functions
Documents & Manual
Other Supported Devices
Frequently Asked Questions
Which server port does the Teltonika FMB125 use with FleetStack?
The Teltonika FMB125 connects on port 5027 using the Teltonika protocol, with Codec 8, Codec 8 Extended and Codec JSON all supported. The server host is issued with your FleetStack account credentials. Ports for other models are on the device port list.
What can I connect to the Teltonika FMB125?
The FMB125 provides RS232, RS485, digital inputs/outputs, analog input, 1-Wire. Power is 10 - 30 V, 1 A max. Sensor and I/O data feeds fuel management, driver behaviour and the alert center. The full pin detail is in Teltonika's datasheet, linked in the documents above.
Which mobile network does the Teltonika FMB125 use?
The FMB125 runs on 2G (GSM/GPRS), GNSS, Bluetooth. Where a 2G network has been retired, Teltonika offers 4G models in the same family — contact FleetStack and we will confirm which suits your market.
Does the Teltonika FMB125 have a backup battery?
Yes — a 170 mAh Li-ion (3.75–3.90 V) backup cell. It is not the primary supply; it keeps the tracker reporting through an external power cut and lets the device raise an unplug alert.
What operating conditions does the Teltonika FMB125 tolerate?
Operating temperature is -40 °C to +85 °C at 5% to 95% non-condensing humidity. Teltonika does not publish an ingress protection rating for this model, so plan for a protected in-cabin or behind-panel installation.
Get Started With Us
Tell us about your fleet and we will get back with pricing, availability, and an onboarding plan for the Teltonika FMB125. You can also book a meeting or read the REST API docs.