A034 DSC to NMEA2000———Solved

[Anonymous]

Hi

I am sending DSC/DSE  data to my A034 via wifi.  Has the translation to NMEA2000 PGN 129808 been implemented yet?

I am using firmware V1.10.211008, but haven’t seen PGN 129808 yet. (the NMEA0183 does get rebroadcast on wifi though)

Thanks

[Technical Team]

Hi,

Our engineering team is working on the implementation of the new features. Hopefully the new firmware supporting the new sentences will be available to download in the following weeks.

Thanks

[Anonymous]

I see there has been updated firmware, and an update to the A034 manual saying that PGN129808 has been implemented.
So using the new V1.10.211221 firmware I tried out the conversion from the following DSC/DSE Distress strings:
$CDDSC,12,5120009530,12,10,00,2410617452,0213,,,S,E*65
$CDDSE,1,1,A,5120009530,00,08880619*1B

The NMEA2000 output from the A034 reads as:
2022-04-16-11:24:09.275 4 123 255 129808 : 20 40 0c 0c 35 31 32 30
2022-04-16-11:24:09.275 4 123 255 129808 : 21 30 30 39 35 33 30 0a
2022-04-16-11:24:09.275 4 123 255 129808 : 22 00 ff ff ff ff ff ff
2022-04-16-11:24:09.275 4 123 255 129808 : 23 ff ff ff ff ff ff 02
2022-04-16-11:24:09.275 4 123 255 129808 : 24 00 40 a3 80 e7 2b 89
2022-04-16-11:24:09.275 4 123 255 129808 : 25 3a 68 2c 2e 00 00 ff
2022-04-16-11:24:09.275 4 123 255 129808 : 26 7f fd ff ff ff ff ff
2022-04-16-11:24:09.275 4 123 255 129808 : 27 ff ff ff ff ff 00 0a
2022-04-16-11:24:09.275 4 123 255 129808 : 28 01 30 38 38 39 30 36
2022-04-16-11:24:09.275 4 123 255 129808 : 29 30 39 00 00 00 00 00

This cannot be parsed by canboat Analyzer, and is rejected by my Garmin chartplotter. One could start with Field #1 and 2: 0x0c 0x0c (ie 12) These do not correspond to allowed values for PGN129808 Field #1,2 : 102-123, 112 (but are the values used by NMEA0183), and the following MMSI is not correct. So the conversion to NMEA2000 appears not to be working.

For comparison here is the result output by an NGW-1 from the same DSC/DSE strings, together with decoding and a few of my annotations:
2022-04-17-04:35:34.254 4 000 255 129808 : 20 59 70 70 33 14 00 5f
2022-04-17-04:35:34.254 4 000 255 129808 : 21 1e 6e 64 ff ff ff ff
2022-04-17-04:35:34.254 4 000 255 129808 : 22 ff ff ff ff ff ff ff
2022-04-17-04:35:34.254 4 000 255 129808 : 23 ff 12 01 ff ff ff ff
2022-04-17-04:35:34.254 4 000 255 129808 : 24 ff ff ff ff ff ff ff
2022-04-17-04:35:34.254 4 000 255 129808 : 25 ff ff ff ff ff 70 69
2022-04-17-04:35:34.254 4 000 255 129808 : 26 80 e7 77 b1 3a 68 c0
2022-04-17-04:35:34.254 4 000 255 129808 : 27 a6 c1 04 ff ff ff ff
2022-04-17-04:35:34.254 4 000 255 129808 : 28 ff 7f fd ff ff ff ff
2022-04-17-04:35:34.254 4 000 255 129808 : 29 ff ff ff ff ff ff ff
2022-04-17-04:35:34.254 4 000 255 129808 : 2a ff ff ff ff ff ff ff
2022-04-17-04:35:34.254 4 000 255 129808 : 2b ff ff 64 0a 01 30 38

2022-04-17-04:35:34.254 4 0 255 129808 DSC Distress Call Information:
DSC Format = Distress; //112 = 0x70
DSC Category = Distress // 112
(DSC Message Address,0x176a32a,0,40) ; DSC Message Address = 5120009530; // MMSI
Nature of Distress = Man overboard; //110 = 0x6E
Subsequent Communication Mode or 2nd Telecommand = No reason givenff ff ff ff ff ff ; Proposed Rx Frequency/Channel = ff ff ff ff ff ff ;
Proposed Tx Frequency/Channel = ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ;
Telephone Number = (-411014800) ;
Latitude of Vessel Reported = -41.1014800(1748676983) ;
Longitude of Vessel Reported = 174.8676983(time 4c1a6c0 = 79800000) ;
Time of Position = 02:13:00(MMSI of Ship In Distress,0x176a35b,0,40) ;
MMSI of Ship In Distress = ;
DSC EOS Symbol = 127;
Expansion Enabled = Yes
ff ff ff ff ff ff ; Calling Rx Frequency/Channel = ff ff ff ff ff ff ;
Calling Tx Frequency/Channel = ;
Time of Receipt = Unknown; Date of Receipt = Unknown; DSC Equipment Assigned Message ID = Unknown; DSC Expansion Field Symbol 1 = Enhanced position30 38 38 38 30 36 31 39 ; DSC Expansion Field Data 1 = 08880619
2022-04-17-04:35:34.254 4 000 255 129808 : 2c 38 38 30 36 31 39 ff

The fields output by the Actisense NGW-1 are  correct (maybe missing MMSI in Field #12?) and the chartplotter  raises the expected MOB Distress alert with correct location and MMSI.

[Quark Elec]

The latest firmware should have solved this issue now. Thanks for your patience.

[Author]

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