USER MANUAL
| LR-15: Radar-activated flashing beacons
4
The default brightness of the beacons can be adjusted. The brightness is controlled with Pulse Width Modulation
(PWM).
The axillary output does not depend on flash patterns and brightness settings. It provides a steady DC voltage
when active.
Both beacons and the auxiliary output can be powered directly from the battery (typically 7.4V DC) or trough the
internal 12V DC stabilizer. In this case, the output voltage does not depend on the type of the battery and the
charge level. This is a customer configurable parameter.
2.4
LOCAL RADIO NETWORK (OPTIONAL*)
LR-15 can transmit real-time speed and RSSI together with additional parameters over the embedded 2.4GHz radio
interface. This data is typically used by speed displays and wireless beacons in the same local radio network.
The local radio network is identified by one of the 16 available radio channels and the network ID code. All devices
with the same radio channel number and the network ID can “hear” each other and “talk” to each other. The
maximum communication distance is about 400 meters (1,300 ft) but it can be significantly reduced by buildings,
trees branches, traffic signs and other obstacles in an urban environment.
There are two types of messages which can be transmitted by LR-15:
•
Raw data
–
includes current speed and RSSI of the closest or fastest vehicle.
•
Smart sign data
–
includes the current speed of the closest or fastest vehicle together with smart display
parameters.
*Note: Active radio transceiver and radio communication require additional power. It is recommended to turn
off the transceiver when the LR-15 is installed as a stand-alone device.
2.5
COMMUNICATION PORTS
LR-15 has two types of communication ports which can be used to set the parameters of the device and download
files from the internal Micro SD card (if inserted):
•
The micro USB port (FTDI COM-over-USB device).
•
Optional 20-pin DIP format module (Bluetooth, Wi-Fi or Cellular modem).
When connected to a computer LR-15 is identified as a serial port (COM port). The default port speed is 115,200
bps.
Note: The Micro USB port cannot be used to recharge the internal battery however it can provide enough power
to operate the unit even without an internal battery. In this case, the beacons may be disabled.
2.6
INPUT POWER AND BATTERIES
LR-15 is powered with a 2 x 4 cells 7.4 Volt lithium-ion batteries pack. The battery is automatically recharged by
the connected solar panel or option AC 120V.240V power supply unit. The LR-15 has embedded the Maximum
Power Point Tracking (MPPT) charging unit specially tuned for 7.4V lithium-ion batteries packs.
