Deif XDi Series - Page 178

DESIGNER’S HANDBOOK 4189350049C EN Page 178 of 206
In this example, the missing wind data is caused by the status flag V indicating that the wind sensor is not able to
calculate the wind data. The data sent from the sensor is invalid.
If there are no communication errors registered and no strange looking sentences without count and time, then it
looks like the communication with the senor is fine, so the fault must be found in the sensor and not in the
installation / wiring.
11.16.1.2 Trouble shooting NMEA input faults
No.
Situation
Result on the XDi indicator
Cause of problem
1
The NMEA sentence looks
fine and is coming from port
2.2
The NMEA data from the
sensor is not auto selected, so
the indicator shows data lost.
The standard library expects the
heading sensor data to be
connected to RS-422 port 2.1 or
2.3. In this case, it is port 2.2 RS-
485 so you must manually select
this input port.
2
The status flag in the
sentence is V
(not A = valid)
The NMEA sentence is
selected as source, but the
indicator shows data lost.
The heading sensor is not able to
measure heading data and is
sending data marked invalid.
3
Data on port 2.1 is shown as
a string of random letters, and
the error counter is increasing
No NMEA heading source is
detected, and the indicator
shows data lost.
The A and B wire is most likely
incorrectly connected. Check that it
is the NMEA wires and try to swap
them around.
4
Data sentence is OK, but
sometimes the indicated time
jumps from 1 to 5 seconds.
Periodic data lost pop-up
Bad connection, in which case
errors and an incorrect sentence
from this slot/port will also often be
registered.
5
The time jumps from 1.0 to
2.0 seconds and the error
counter increases.
The heading indicator seems to
work OK
The time jump indicates that data
are lost. It may be due to a bad
connection or electrical
interference.
6
The heading sentence looks
OK, but the talker ID is WA
(not HE)
No data source is indicated,
and data is missing.
WA is not a valid talker ID and the
sentence is therefore rejected.
If you know the sentence is OK,
you can manually set the talker ID
to “don’t care” and the sentence
will be accepted.
8
The heading sentence is
dropping out periodically
Data lost is indicated. The
pointer and digital readout is
flashing.
Bad interface cable connection.
Bad cable shield connection or
grounding of the sensor.