FMU125 General description

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Main Page > EOL Products > FMU125 > FMU125 Manual > FMU125 General description

FMU125 is small and professional real-time tracking terminal with GNSS and 3G/GSM connectivity and backup battery. Device equipped with GNSS/Bluetooth and 3G modules, internal GNSS and internal 3G antennas. FMU125 feature RS232 data interface, which gives ability to connect various third-party external devices. It is perfectly suitable for applications where location acquirement of remote objects is needed: fleet management, car rental companies, taxi companies, public transport, logistics companies, personal cars and so on.

Package contents

The FMU125 device is supplied to the customer in a cardboard box containing all the equipment that is necessary for operation. The package contains:

  • FMU125 device;
  • Input and output power supply cable with 2x6 connection pins;
  • Micro USB cable;
  • 3.7 V 170 mAh rechargeable Li-ion battery.

Basic characteristics

GSM / GPRS / GNSS features:

  • Quectel UC15-A/UC15-T or Quectel UG96, TM2500 (3G(UMTS/HSPA)/2G(GSM/GPRS)/GNSS/BLUETOOTH);
  • GPRS Multi-Slot class 12 (Up to 240 kbps);
  • SMS (text, data);
  • Integrated GNSS receiver;
  • Up to -165 dBm GNSS receiver sensitivity.

Hardware features:

  • Built-in movement sensor;
  • Built-in Bluetooth 4.0 LE;
  • Internal High Gain GNSS antenna;
  • Internal High Gain GSM antenna;
  • Internal flash memory 128MB (422 400 Records);
  • 170 mAh Li-ion rechargeable 3.7 V battery (0.63 Wh).

Interface features:

  • Power supply: +10... +30 V;
  • 2 digital inputs;
  • 1 analog input;
  • 1 open collector digital output (connecting external relays, LED, buzzers etc);
  • 1-Wire temperature sensor;
  • 1-Wire iButton;
  • 1 RS-232 interface;
  • 1 RS-485 interface;
  • 2 LEDs indicating device status.

Special features:

  • Fast position fix (Outdoor areas);
  • High Quality track even in high density urban canyon;
  • Ultra small case;
  • Ready for harsh environment;
  • Easy to mount in limited access areas;
  • Firmly fasten;
  • 2 LED status indication;
  • Real time tracking;
  • Smart data acquisition based on:
    • Time;
    • Speed;
    • Angle;
    • Distance;
    • Ignition or any other I/O event;
  • Sending acquired data via GPRS;
  • GPRS and SMS I/O events;
  • Virtual odometer;
  • Jamming detection;
  • Configurable using Secured SMS Commands;
  • 2xSIM Card (Dual-SIM)
  • Overvoltage protection;

Technical features

Part name Physical specification
Navigation indication LED
Modem indication LED
Socket Soldered inner socket
USB Micro USB socket
GNSS Internal GNSS antenna
GSM Internal GSM antenna

Technical details
2 W max.
Current consumption at 12 V (Power supply 10...30 V DC)
GPRS: average 64.59 mA rms
Nominal: average 37.77 rms
GNSS sleep: average 11.1 mA
Deep Sleep: average 6.2 mA
Online Deep Sleep: average 6.5 mA
Battery charge current Average 140 mA
Operating temperature (without battery) -40..+85 °C
Storage temperature (without battery) -40..+85 °C
Storage relative humidity 5..95% (no condensation)
Device + case + battery weight 52 g

Dimension drawing:

Fmb122-125 view dims.png

Technical information about internal battery

Internal back-up battery Battery voltage (V) Nominal Capacity (mAh) Power (Wh) Charge temperature (°C) Discharge temperature (°C) Storage temperature (°C)
Li-ion rechargeable battery 3.75~3.90 170 0.64 – 0.66 0 to +45 -20 to +60 -20 to +45 for 1 month
-20 to +35 for 6 months

Batteries are covered by 6 month warranty support.

Bw disposal.png Battery should not be disposed of into general household waste.
Bring damaged or worn-out batteries to your local recycling center or dispose them into a battery recycle bin commonly found in supermarkets.

Electrical characteristics

Characteristic description Value
Min. Typ. Max. Unit
Supply Voltage:
Supply Voltage
(Recommended Operating Conditions)
+10 +30 V
Digital Output (Open Drain grade):
Drain current (Digital Output OFF) 120 µA
Drain current
(Digital Output ON, Recommended Operating Conditions)
0.1 0.5 A
Static Drain-Source resistance
(Digital Output ON)
400 600
Digital Input:
Input resistance (DIN1) 47
Input resistance (DIN2) 51.7
Input voltage
(Recommended Operating Conditions)
0 Supply voltage V
Input Voltage threshold (DIN1) 7.5 V
Input Voltage threshold (DIN2) 2.5 V
Analog Input:
Input voltage
(Recommended Operating Conditions), Range 1
0 +10 V
Input resistance, Range 1 150
Measurement error on 12V, Range 1 3 %
Additional error on 12 V, Range 1 360 mV
Measurement error on 30 V, Range 1 3 %
Additional error on 30 V, Range 1 900 mV
Input Voltage
(Recommended Operating Conditions), Range 2
0 +30 V
Input resistance, Range 2 150
Measurement error on 12V, Range 2 3 %
Additional error on 12 V, Range 2 360 mV
Measurement error on 30 V, Range 2 3 %
Additional error on 30 V, Range 2 900 mV
Output Supply Voltage 1-Wire:
Supply voltage +4.5 +4.7 V
Output inner resistance 7 Ω
Output current (Uout > 3.0 V) 30 mA
Short circuit current (Uout = 0) 75 mA
RS232/RS485 Input Voltage:
RS485 input voltage range on A or B pin
(common-mode voltage)
-7 +12 V
RS232 input voltage range
(common-mode voltage)
-15 +15 V

Analog Input error margin can increase if temperature varies.

Absolute maximum ratings

Characteristic description Value
Min. Typ. Max. Unit
Supply Voltage
(Absolute Maximum Ratings)
-32 +32 V
Drain-Source clamp threshold voltage
(Absolute Maximum Ratings), (Idrain = 2 mA)
+36 V
Digital Input Voltage
(Absolute Maximum Ratings)
-32 +32 V
Analog Input Voltage
(Absolute Maximum Ratings)
-32 +32 V
RS232 Input Voltage
(Absolute Maximum Ratings)
-25 +25 V