SX BLUE GPS iSXblue II+ GNSSTM, User Manual

Page: 83 / 107

SXblue Series User Manual 82
Table 4-2 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
SXblue, it is possible it is still in programming mode. The
SXblue will not communicate while in this state. Simply
power cycle the SXblue 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, Atlas, 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 SXblue and the other device. It
will remain on until the connection is broken.