RS232 + RS485 Interfaces
Dual serial interfaces for fuel level sensors (LLS), Garmin FMI navigation, RFID readers, and other onboard fleet accessories.
GPS Tracker
FMB125 2G Advanced Tracker
An advanced 2G Teltonika tracker built for fuel monitoring, refrigerated transport, and international logistics — with RS232, RS485, 1-Wire, Dual SIM, and CAN adapter support in one compact device.
2G GSM
RS232 + RS485
Bluetooth 4.0
Dual SIM
Power Input
10 – 30V DC
Memory
128 MB Flash
Connectivity
2G GSM Quad-band
Backup Battery
170 mAh Li-Ion
Device Size
65 × 56.6 × 20.6 mm
SIM Cards
Dual SIM for roaming
Why it is useful
Built for fuel monitoring, cold chain, and cross-border fleets
FMB125 is the go-to tracker when fleets need RS232/RS485 fuel sensor integration, temperature monitoring, Dual SIM for international roaming cost reduction, and CAN adapter compatibility.
Temperature & Cold Chain
1-Wire interface enables direct connection of temperature sensors — ideal for refrigerated transport and cold chain monitoring.
Dual SIM Roaming
Two SIM card slots significantly reduce roaming costs for international logistics and cross-border fleet operations.
Use Cases
Where FMB125
Where FMB125
fits well
Use FMB125 where fuel monitoring, cold chain temperature, international roaming, or CAN-bus data are required alongside standard fleet tracking.
- Fuel monitoring using LLS sensors via RS232/RS485 for precise consumption tracking and theft detection.
- Refrigerated transport and cold chain logistics with 1-Wire temperature sensor integration.
- International logistics and cross-border fleets using Dual SIM to reduce roaming costs.
- Agriculture and construction fleets via CAN adapters (LV-CAN200, ALL-CAN300, CAN-CONTROL).
- RFID driver identification, Garmin navigation integration, and barcode scanner deployments via RS232.
Features and Specifications
Product Specifications
FMB125 captures vehicle location, fuel levels, temperature, and sensor data for Aether's connected operations platform. The details below highlight specs most relevant for installation planning.
Network & Location
| Cellular | 2G GSM Quad-band 850/900/1800/1900 MHz |
| GNSS | GPS, GLONASS, GALILEO, BEIDOU, SBAS, QZSS, DGPS, AGPS |
| SIM | Dual SIM (reduces roaming costs) |
| Bluetooth | 4.0 + LE for sensors & accessories |
Location Accuracy
| Position accuracy | <2.5 CEP |
| Tracking sensitivity | -165 dBm |
| Hot start | <1 s |
| Cold start | <35 s |
Serial & I/O
| RS232 | LLS, Garmin FMI, RFID HID/MF7, NMEA, TCP |
| RS485 | LLS, NMEA, TCP ASCII/Binary |
| Digital Input | 1 DIN (ignition, door, alarm) |
| Analog Input | 1 AIN (0–30V) |
| Digital Output | 1 DOUT (relay, immobiliser, buzzer) |
| 1-Wire | Temperature sensor, iButton driver ID |
| CAN Adapter | 1 — LV-CAN200, ALL-CAN300, CAN-CONTROL |
Events & Alerts
| Ignition | On / Off detection |
| Geofence | Zone entry / exit alerts |
| Harsh events | Acceleration, braking, cornering |
| Towing | Movement without ignition |
| Crash detection | Accelerometer-based |
| Custom events | Configurable via I/O parameters |
Power Supply
| Input voltage | 10 – 30V DC |
| Protection | Overvoltage & reverse polarity |
| Current (nominal) | <38 mA @ 12V (no load) |
| Backup battery | 170 mAh Li-Ion, 3.7V |
| Battery spec | 3.7V, 170 mAh, 0.63 Wh Li-Ion |
Sleep Modes
| GPS Sleep | GNSS off; GSM active (<12 mA) |
| Online Deep Sleep | Server connection kept (<7 mA) |
| Deep Sleep | Periodic wake (<6.5 mA) |
| Ultra Deep Sleep | Minimum power draw (<6 mA) |
| Wake trigger | Ignition, movement, timer, I/O |
Physical
| Dimensions | 65 × 56.6 × 20.6 mm |
| Weight | 52 g |
| GNSS Antenna | External SMA connector (internal optional) |
| Enclosure | IP41 rated |
| Operating temp | -40°C to +85°C |
| Memory | 128 MB internal flash |
Configuration
| Remote config | FOTA Web, FOTA over air |
| Local config | Teltonika Configurator (USB) |
| SMS config | Supported |
| BT config | Bluetooth 4.0 wireless |
| Protocol | Codec 8 / Codec 8 Extended |
Aether Integration
Connect hardware data to real operations
Aether connects FMB125 data — including fuel levels, temperatures, trip events, and CAN readings — into unified fleet dashboards and operational reports.
- Live vehicle location, route history, trip summaries, and utilization insights.
- Fuel level trends, refill detection, consumption analysis, and theft alerts from RS232/RS485 LLS sensors.
- Temperature monitoring alerts for cold chain breaches, setpoint deviations, and equipment failures.
- Installation planning, calibration support, and device configuration for each vehicle category.
FAQ
Common questions about FMB125
Yes. FMB125 supports both RS232 and RS485 interfaces, making it compatible with LLS digital fuel sensors, OBDII dongles, and Aether's fuel monitoring platform for consumption tracking, refill detection, and theft alerts.
Yes. The 1-Wire interface supports direct connection of Dallas/Maxim temperature sensors, making FMB125 suitable for cold chain monitoring in refrigerated trucks and containers.
Dual SIM significantly reduces roaming costs for international logistics and cross-border fleets by automatically switching to the lower-cost SIM in each country. This is one of FMB125's key differentiators for international transport operators.
Yes. FMB125 is compatible with Teltonika CAN adapters including LV-CAN200, ALL-CAN300, and CAN-CONTROL, enabling engine data reading for agriculture and construction vehicles.
FMB125 uses 2G (GSM) connectivity while FMC125 uses 4G LTE Cat 1. FMB125 adds Dual SIM, 1-Wire temperature interface, and CAN adapter support. FMC125 is recommended for 4G network coverage requirements; FMB125 suits international, fuel-monitoring, and cold-chain deployments.
Need help choosing the right tracker?
Share your vehicle type, sensor requirements, and whether you need international SIM coverage. Aether can recommend whether FMB125 or another model fits your deployment best.