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Revision 1.8 Appendix E – Transmitting the HDT Sentence Page E1
®®
Appendix E - Configuring the SSC200 to Transmit the HDT
Sentence for Satellite Antennas and Radars
The SSC200 is factory configured to transmit the HDG sentence 10 times per second. However, certain satellite
antennas and radars need the HDT sentence. This application note explains how to change the transmitted
sentence from to HDT.
Prerequisites:
• The SSC200 compass must have firmware revision 1.7 or greater.
• The SSC200 compass must have a GPS source for magnetic variation information or must be manually
programmed with the local magnetic variation (Please see Maretron Application Note #2, “Configuring the
SSC200 to transmit True Heading Data”)
Instructions:
1. Connect the SSC200 to the PC's serial port and obtain the “cmd>” prompt per the instructions in
Appendix C.
2. To disable transmission of the HDG sentence, type the following sentence:
$PMARSETPX,SSC200,,00,0
3. To enable transmission of the HDT sentence at 100 ms intervals (10 times per second), type the
sentence:
$PMARSETPX,SSC200,,02,100
*Note: For compasses with firmware revision 1.8 or greater, a NMEA 0183 checksum is optional. For
compasses with earlier firmware revisions, a correct NMEA 0183 checksum is required.
4. Type “exit” or simply power the SSC200 off and then on again. You should now observe HDT sentences
being transmitted.