Appendices
Copyright © 2015 Coda Octopus Products Ltd
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F180R MOTION Sensor User and Reference Guide
6.4.1.3 Differential / RTK Correction Input
Q : I cannot get the F180R System to detect any GPS correction input, what should I do ?
A : Check that the Diff / RTK corrections are input into J3 on the umbilical. The incoming signal
should use the same serial transmission parameters and string format as those defined in the
Configuration Wizard.
NOTE: Receive (Rx) pin on J3 is Pin 3 for correction input
6.4.1.4 System Operation
Q : The F180R System does not seem to work or initialise and the unit Status LEDs show:
Navigation / Off
GPS Heading / Off
GPS Position / Flash Green
Power-Comms / Flash Green
A : The sequence indicates that the F180R System has failed to complete the startup sequence
and is now operating in recovery mode. The recovery mode will run for two minutes prior to
restarting the system. During this period it is possible to perform tasks such as firmware
update.
In the recovery mode the system IP address reverts to 195.0.0.180. This is a fail safe mode that
facilitates network access since it is a known default.
Q : The Heading Initialisation does not seem to be completing ?
A : The successful completion of the Heading Initialisation process is dependent on an
acceptable GNSS constellation. On occasion you might see the Satellite>Slave 3 PRN ID report
No Slave 3. This is due to satellite configuration. However it should not persist for more than a
few minutes as the satellite constellations are constantly changing.
The Antenna Separation must also be correct. Check your calibration parameters settings.
Refer to Search Parameter Status for a full listing of initialisation states.
Q : The search parameter status is reporting "No Seed" and initialisation does not progress ?
A : The "NO SEED" status is reported when the heading initialisation is unable to select the
centre of the integer ambiguities search cube.
The centre of the search cube is chosen as follows:
(1) for antenna separations of less than 2.05 metre, the search cube is centred at the origin.
For these antenna separations, the "NO SEED" status code should never be reported.
(2) for antenna separations above 2.05 metres, the search cube is centred on an average
differential solution if it is accurate enough. The "NO SEED" status is reported when the
average differential solution is not deemed to be sufficiently accurate to initiate the search
cube.
If the "No Seed" condition persists then you should use an antenna baseline of less than 2.05
metres which will also deliver optimal performance in initialisation and calibration times.
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