APPENDICES Page 63
Document id: 7000 108-011 A2
APPENDIX A.4 – PROPRIETARY OUTPUT SENTENCES (PSTT)
Additional to the standardised IEC sentences (described in IEC
61993-2) the R4MkII-AIS Transponder is able to output the
following proprietary sentences.
$PSTT,10A – UTC Date and Time
This sentence provides UTC Date and Time, i.e. R4MkII System
Time (based on internal GNSS time). It is output approximately
once every 10 seconds (± 1 s).
$PSTT,XXX,YYYYMMDD,HHMMSS
Field Format Name Type Range
1 10A Sentence Id Unsigned
char
10A always
2 YYYYMMDD Date Char[8] Year, month and day in decimal notation.
(00000000 = Not available)
3 HHMMSS Time Char[6] Hour, minute and second in decimal
notation.
(999999 = Not available)
Example: $PSTT,10A,19961028,135230*<FCS><CR><LF>
= Date October 28, 1996
= Time 13:52:30 UTC
$PSTT,10C – Data Link Status
This sentence provides information about the traffic on the VHF
data link. It is output approximately once every 60 seconds. Traffic
load is calculated over the last frame (i.e. 60 seconds). Number of
units is derived from the internal user list and is generally the
number of received units within the last few minutes.
$PSTT,10C,C,S,LLL,NNNN
Field Format Name Type Range
1 10C Sentence Id Unsigned
char
10C always
2 C Channel Unsigned
char
A = VDL channel A
B = VDL channel B
3 LLL Traffic Load Unsigned
short
Data link traffic load in percent, 0-100,
which equates to 0 to 100%.
4 NNNN No of Units Unsigned
short
No of units occupying the data link.
$PSTT,1F3 – Transponder Restart
This sentence will be output when the transponder has restarted.
$PSTT,1F3,R
Field Format Name Type Range
1 1F3 Sentence Id Unsigned
char
1F3 always
2 R Restart
Reason
Unsigned
char
0 = Unknown
1 = Cold Start
2 = General Protection Fault
3 = Power Fail
4 = Warm Start
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