Jeppesen Nobeltec Solid State Heading Sensor, Руководство пользователя

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APPENDIX A – NMEA 0183 INTERFACING
Jeppesen Marine
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APPENDIX A – NMEA 0183 INTERFACING
SSHS NMEA 0183 Transmitted Sentences
The following data sentences are transmitted to your Nobeltec Navigation Software as
Heading Sensor data. See your Nobeltec Navigation Software Owner’s Manual for more
information about Heading Sensor data, including setting Deviation Table adjustments, Master
Headings, ARPA and MARPA Target Tracking, etc.
HDG – Heading, Deviation & Variation
The SSHS indicates heading 10 times a second. The deviation field will always display zero,
as the SSHS reports its heading with deviation included. The variation field will normally
contain the null character. However, if the SSHS receives either a valid RMC or VTG
sentence, then the SSHS will fill the variation field appropriately.
$IIHDG,A,B,C,D,E*hh<CR><LF>
Field A
: Magnetic heading sensor including deviation in tenths of degrees
B
: Deviation always reads 0.0 because it the deviation value is included in field A
C
: Although this field reads as “E”, this value is meaningless, as the deviation is always
zero
D
: Null unless receiving variation data form RMC or VTG sentence in which case
variation data
E
: Null unless receiving variation data from RMC or VTG sentence in which case E or W
depending on direction of variation
HDM – Heading, Magnetic
The SSHS does not normally transmit this sentence because it is no longer recommended for
new designs by NMEA. However, this sentence can be enabled or turned on via a proprietary
NMEA 0183 sentence (see $PMARSETP on
Page 29
).
$IIHDM,A,B*hh<CR><LF>
Field A
: Magnetic heading sensor including deviation in tenths of degrees
B
: This field always contains an “M” indicating magnetic heading
HDT – Heading, True
The SSHS does not normally transmit this sentence. However, this sentence can be enabled
or turned on via a proprietary NMEA 0183 sentence (see $PMARSETP on
Page 29
). The HDT