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SSC200 User’s Manual
Page A2 Appendix A – NMEA 0183 Interfacing Revision 1.8
D-I: Null
TXT – Text Transmission
The SSC200 transmits various status messages using the text transmission sentence.
$IITXT,A,B,C,D*hh<CR><LF>
Field A: Always reads “01”
B: Always reads “01”
C: Message identifier (see following table)
D: Text string (see following table)
Message
Identifier
Text String Description
01 Deviation Calibration
Started
This message is transmitted at the beginning of the magnetic deviation
calibration process.
02 Deviation Calibration
Completed Successfully
This message is transmitted upon successful completion of the magnetic
deviation calibration process (i.e., a new deviation table has been stored
in permanent memory).
03 Deviation Calibration
Failed to Complete
The SSC200 attempts to perform calibration 5 times before giving up and
issuing this sentence. Each time the SSC200 encounters an error (see
message identifiers 04, 05, and 06) it restarts the calibration process.
Upon the 5
th
error, the SSC200 exits the calibration routine and it must
be restarted before it will once again try to perform deviation calibration.
04 Deviation Calibration
Turning Too Fast
During calibration, the vessel must not turn to fast where the SSC200 is
unable to reliably develop deviation data. If the SSC200 senses the
vessel turning to quickly, it will issue this message and restart deviation
calibration as long as it has not failed five times.
05 Deviation Calibration
Turning Too Slow
During calibration, the vessel must not turn to slowly where the SSC200
is unable to reliably develop deviation data. If the SSC200 senses the
vessel turning to slowly, it will issue this message and restart deviation
calibration as long as it has not failed five times.
06 Deviation Calibration
Invalid Movement
During calibration, the vessel must not jerk or reverse directions where
the SSC200 is unable to reliably develop deviation data. If the SSC200
senses an invalid movement, it will issue this message and restart
deviation calibration as long as it has not failed five times.
95 Serial Number: xxxxxxx The SSC200 transmits this sentence once after it is powered up to
indicate its serial number.
96 Baud Rate: 4800 The SSC200 transmits this sentence once after it is powered up to
indicate its baud rate.
97 SW Version: 1.2 The SSC200 transmits this sentence once after it is powered up to
indicate its software version.
98 Model Version: 1.0 The SSC200 transmits this sentence once after it is powered up to
indicate its model version.
99 Model ID: SSC200 The SSC200 transmits this sentence once after it is powered up to
indicate its model identification.