DESIGNER’S HANDBOOK 4189350049C EN
Page 168 of 206
In this case XDi has found sources for all 6 NMEA data types that is supported by the selected product profile and
used by the heading indicator we have selected from the standard heading indicator library.
As we will see later the number of usable sources does not necessarily need to be 6 it depends on the indicator we
have selected, and the data needed for that indicator.
11.13.3.2.2
Test of the heading system
On the surface everything looks OK after we have made the auto setup and XDi has returned to normal operation,
but when we now test the system by shifting between the 3 heading sources on the controller between Gyro1,
Gyro2 and Mag. Compass and the controller is only transmitting the relevant NMEA sentences from respectively
Gyro 1 $HEHTD (and $HEHDT), Gyro 2 $IIHDT and Mag. Compass $HEHDG.
We would expect XDi to use the fall-back function to automatically shift source depending on the received heading
data. But it turns out that only Gyro 1 and Mag. Compass are working when we select Gyro 2 we get a NMEA data
lost message.
Something in the Gyro 2 setup is not correct.
11.13.3.2.3
A look in the NMEA input setup menu may help us
Select NMEA input
setup….
In this case we have not made any changes of the NMEA data so a new Auto scan is not needed, so we will go
directly to
“Manual input selection…” menu:
