Maretron SSC200 User Manual

Page 31

Revision 1.8

Appendix A – NMEA 0183 Interfacing

Page A5

5. To disable transmission of the HDT sentence:

$PMARSETPX,SSC200,,02,0

6. To enable transmission of the HDT sentence at intervals of 100 ms:

$PMARSETPX,SSC200,,02,100

7. To disable transmission of the ROT sentence:

$PMARSETPX,SSC200,,03,0

8. To enable transmission of the ROT sentence at intervals of 100 ms:

$PMARSETPX,SSC200,,03,100

9. To disable transmission of the PMAROUT sentence:

$PMARSETPX,SSC200,,04,0

10. To enable transmission of the PMAROUT sentence at intervals of 1 sec:

$PMARSETPX,SSC200,,04,1000

PMARSETP – Maretron Proprietary Set Period Sentence
NOTE: This sentence is included for compatibility with older versions of SSC200 firmware. The
PMARSETPX sentence offers finer resolution and should be used if available.
The SSC200 can be programmed to enable or disable the periodic transmission of the HDG, HDM,
HDT, ROT, and PMAROUT sentences. In addition, the periodic transmission rate for these sentences
and the Variation Lifetime (see RMC and VTG) can be programmed using this sentence.

$PMARSETP,SSC200,,A,B*hh
Field A: Identifier code, identifies the sentence or parameter to be programmed (see following table)

B: Integer where “0” disables sentence and positive numbers are multipliers of 1ms (i.e.,

programmed integer of 2 would mean a 200ms transmission interval)

Identifier Code

Sentence

Default Rate

HDG

1 or 100ms

HDM

0 or Disabled

HDT

0 or Disabled

ROT

2 or 200ms

PMAROUT

10 or 1sec

Variation Lifetime

50 or 5sec

SSC200 NMEA 0183 Initiated Deviation Calibration

NMEA 0183 initiated deviation calibration is accomplished by turning the vessel through at
least 3 complete circles after the SSC200 receives a Maretron proprietary NMEA 0183
sentence. The procedure is as follows:

1. Ensure that the compass has been properly installed per Section 2,
2. Warm up the compass by operating it for approximately 10 minutes,
3. Turn the vessel (either direction) such that you complete a full 360° turn in 2½ minutes

or less (try not to go below 1 minute for a complete circle),

4. Send the following Maretron proprietary NMEA0183 sentence to the SSC200 while

continuing to turn the vessel:

a. $PMAREXE,SSC200,,FD,0,,, This will turn off all periodic transmissions

such that you can easily see status messages associated with the calibration
process

b. $PMAREXE,SSC200,,F0,,,, This will initiate a reset and force the

SSC200 to start the calibration process