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Hello everyone, this is Allen, Sales Director from iStartek with more than 6years of experience in the GPS field, In this article, we will show you how to use iStartek VT200 L with an ultrasonic fuel sensor GPS via RS232.

  1. Preparation before starting:
  2. The laptop which is using Windows system, with below software on it:

VT200 L Parameter editor

comm tool

USB Driver

  1. VT200 L which is using V107 version firmware or higher version
  2. iStartek USB Cable
  3. UL212 Ultrasonic fuel sensor
  4. Before connecting the VT200 L tracker with the UL212 ultrasonic fuel sensor GPS, we need to set fuel tank parameters via Parameter Editor or via SMS command.

The contents are marked in Red must fill in, then click write.

Ultrasonic fuel sensor

After set ready, click “Close” on Parameter editor, then connect VT200 L with comm tool, to let it read out data.

  1. Learn about UL212 Ultrasonic fuel sensor

UL212 Ultrasonic fuel sensor is Wireless BLE All-in-One Ultrasonic Fuel Level Sensor, UL212 Ultrasonic fuel sensor can be used for Fleet Fuel Monitoring/Telematics. Ul212 Ultrasonic fuel sensor GPS can work with iStartek VT200 L GPS Tracker by Analogy input or RS232 Port, it’s quite easy.

UL212 Ultrasonic fuel sensor has below advantages:

  • No Drilling Holes in Tank, Easy Installation
  • Support Any Liquid: Diesel, Gasoline, Water, etc.
  • Support Any Material Tank: Metal/Aluminum/Stainless Steel /Fiber/Plastic
  • Resolution: 0.1mm
  • Accuracy: 99.5%
  • Mobile App Configuration &Calibration
  • IP68 waterproof

iStartek Ultrasonic fuel sensor

  1. UL212 Ultrasonic fuel sensor connect with VT200 L via RS232 Wire connection details:

UL212 Ultrasonic fuel sensor Yellow wire (TX) connect with VT200 L Green wire (RX)

UL212 Ultrasonic fuel sensor White wire (RX) connect with VT200 L White wire (TX)

UL212 Ultrasonic fuel sensor Red wire connect with VT200 L red wire connect with power supply +

UL212 Ultrasonic fuel sensor black wire connect with VT200 L black wire connect with power supply –

After connecting VT200 L with UL212 Ultrasonic fuel sensor, we can see there is “RS232-1 Receive Data” shown on comm tool, that means VT200 L is testing ok with UL212 Ultrasonic fuel sensor, then we can check if data is correct.


Inside the location data 010013 is the data Ul212 Ultrasonic fuel sensor detected, the number of liters of a fuel tank is expressed in 6-digit hexadecimal format, the first 2 characters are the number of the fuel tank, and the last 4 characters are the number of liters*10.

So the first 01 means the first tank, we transfer 0013 from hex to dec is 19, so fuel is 1.9L.

Also, the fuel_volume shown on the platform is 1.9L.


If you have any queries in using VT200 L with iStartek UL212 ultrasonic fuel sensor GPS, welcome to message us freely.


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