iSXblue/SXBlue II GNSS Series Technical Reference Manual
146
Table 8-2 LED Functions
Power LED: (
Red
)
This LED should be on (solid) once power is applied to the
receiver. This is the only LED that is not under GPS computer
control.
Once the battery voltage reaches a certain threshold, this LED
will start blinking (roughly 15-20 minutes prior to auto
shutdown).
GPS LED: (
Green
)
This LED serves two purposes:
At power-on if it starts blinking, the GPS processor is likely
faulty.
After a minute or so, this LED should go on solid green to
indicate that GPS has locked. This is true even if differential
corrections are not available. If the LED is continually blinking
and you have been programming your iSXBlue/SXBlue II
GNSS, it is possible it is still in programming mode. The
iSXBlue/SXBlue II GNSS will not communicate while in this
state. Simply power cycle the SXBlue II GPS to restore normal
communications.
DGPS LED: (
Orange
)
This LED will remain off until a differentially corrected GPS
solution is available. It will blink at a steady rate if the solution
has not converged to the accuracy specified by the $JLIMIT
command and will become solid yellow after the solution has
converged. (The $JLIMIT sets the threshold for the RMS
residual error and this error gives a rough indication of expected
user accuracy. Note, however, that it is not a direct measure of
accuracy. Factors such as constellation geometry must also be
taken into account. The default value for $JLIMIT is 10 meters).
It will also blink if the solution is a 2D solution (see the $JALT
command).
Differential Source LED: (
Yellow
)
This LED can be in several states:
Off – Differential signal has not been received.
Flickering on and off – the receiver is close to acquiring the
differential signal.
Blinking at a steady rate - Differential signal has been acquired,
but the Bit-Error-Rate (BER) of the “best” signal tracked is
higher than 150.
Generally, this will not affect performance, but it is a warning of
weak signal strength.
On Solid – WAAS, Omnistar, Radio Beacon or external
differential correction has been acquired and signal strength is
good.
Bluetooth LED: (
Blue
)
This LED will remain off until a Bluetooth connection is
established between the iSXBlue/SXBlue II GNSS and the other
device. It will remain on until the connection is broken.
