Use

Indicator, signal and control features are located on the front of the electronic device (On-Board Unit).

When an electronic device is connected to a power source, it turns on whenever:

• you switch on the ignition; or
• the vehicle starts moving; or
• after pressing the button.

Before driving, while driving and after driving on toll roads, the driver is required to check the functionality and accuracy of the electronic device settings.

The meaning of the individual indicator, signal and control features is described below.

User interface

1. Main status LED
2. Setting the vehicle category (switching between the permitted number of axles down)
3. Activating/deactivating the sound signal
4. Setting the vehicle category (switching between the permitted number of axles)
5. Initiation of manual communication (long press, 3 seconds)
6. Credit amount indication
7. External power supply
8. - 10. Vehicle axle number indication

Setting the vehicle category and signalling

The activation and basic setting of the electronic device is performed by an authorized system operator employee at a point of sale, based on the registration data of the vehicle registered in the electronic toll system. In the process of downloading the electronic device, it is necessary to check the accuracy of the data as well as the accuracy of the indicated setting of the electronic device and the indicated operating status of the electronic device.

If there is a change in the number of vehicle axles before or during use of toll roads (e.g. trailer connection), the user is obliged to change the number of axles using the appropriate electronic device control to match the actual vehicle category (or actual number of axles).

To change the number of axles, press “  " or “ " and if necessary, repeatedly until the number of axles displayed in the corresponding symbol matches the actual condition of the vehicle or vehicle combination. To activate or deactivate the sound signal, press the “  " button.

Indications of vehicle category and number of axles.

Vehicle type	Vehicle parameters
	Number of axles	Symbol	Colour	Flashing
Truck over 3.5 tons	<= 2		Green	No
	3
	4
	>=5
Bus	<= 2		Green	No
	3
	4
	>=5

Credit level light signalling.

Credit amount	Colour	Flashing
Sufficient - active	Green	No
Reduced - pre-warning	Green	No
Low - warning	Yellow	No
Insufficient - blocked	Red	No

Battery status light indicator (accumulator).

External power supply
	Connected?	Colour	Flashing
Connected	Yes	Green	No
	Yes	Yellow	No
	Yes	Yellow	No
Defective battery		Red	No
Disconnected	Yes	Green	Yes
	Yes	Yellow	Yes
	Yes	Yellow	Yes

You can download the Billien OBU 5051 Electronic Device User’s Guide in the Downloads section.