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Appendix A LED Status Indicators
24
Appendix A
LED Status Indicators
A.1
AsteRx4_OEM LEDs
The LED pins of the 80-pin connector (see section 2.3) can be used to monitor the receiver
status. They can be used to drive external LEDs (max drive current 8mA). It is assumed
that the LED lights when the electrical level of the corresponding pin is high.
LED Name
LED Behaviour
LANLED
LED lights solid to indicate Ethernet link. When transmit or receive activity is
sensed, LED will flash as an activity indicator.
POWERLED
LED lights when the receiver is switched on.
LOGLED
LED lights when data is being written to the internal SD memory card. If the
logging rate is larger than 1 Hz, LED lights continuously.
PVTLED
LED lights when a PVT solution is available.
GPLED
General-purpose LED. The function of this LED is configured with the
setLEDMode
command. By default, this LED has the DIFFCORLED function
(see below).
DIFFCORLED
Differential correction indicator. In rover PVT mode, this LED reports the
number of satellites for which differential corrections have been provided in
the last received differential correction message (RTCM or CMR).
LED behaviour
Number of satellites with
corrections
LED is off
No differential correction
message received
blinks fast and continuously
(10 times per second)
0
blinks once, then pauses
1, 2
blinks twice, then pauses
3, 4
blinks 3 times, then pauses
5, 6
blinks 4 times, then pauses
7, 8
blinks 5 times, then pauses
9 or more
The LED is solid ’ON’ w
hen the receiver is outputting differential corrections
as a static base station.
TRACKLED
LED behaviour
Number of satellites in tracking
blinks fast and
continuously (10 times per
second)
0
blinks once, then pauses
1, 2
blinks twice, then pauses
3, 4
blinks 3 times, then pauses 5, 6
blinks 4 times, then pauses 7, 8
blinks 5 times, then pauses 9 or more
During boot, i.e. during the first seconds after powering the receiver, the LED state is not
defined, except for the POWERLED.
