Oxford Technical Solutions Ltd
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LED definitions
Three LEDs on the xOEM board set show the system’s state when power is applied. Table 3, Table 4,
and Table 5 give details on the meanings of the states of each LED.
Table 3: GNSS LED states
Colour
Description
Off
GNSS receiver fault (valid only after start-up).
Red flash
GNSS receiver is active but has been unable to determine heading.
Red
The GNSS has a differential heading lock.
Orange
The GNSS receiver has a floating (poor) calibrated heading lock.
Green
The GNSS receiver has an integer (good) calibrated heading lock.
Table 4: Status LED states
Colour
Description
Off
The operating system has not yet booted and the program is not yet running.
This occurs at start-up.
Red-green flash
The xOEM is asleep. Contact OxTS support for further information.
Red flash
The operating system has booted and the program is running. The GNSS
receiver has not yet output a valid time, position, or velocity.
Red
The GNSS receiver has locked-on to satellites and has adjusted its clock to
valid time (the 1PPS output will now be valid). The strapdown navigator is ready
to initialise. If the vehicle is travelling faster than the value set for
“Initialisation
speed” during configuration then the strapdown navigator will initialise and the
system will become active. If static initialisation has been enabled the system
will initialise once the GNSS receiver has determined heading, even if the
vehicle is stationary or moving slowly.
Orange
The strapdown navigator has initialised and data is being output, but the
system is not real-time yet. It takes 10 s for the system to become real-time
after start up.
Green
The strapdown navigator is running and the system is real-time.
Table 5: Power LED states
Colour
Description
Off
There is no power to the system or the system power supply has failed.
Green
Power is applied to the system.
Orange
The system is powered and traffic is present on Ethernet.
