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Appendix A | V5035 Operator and Installation Manual
TXT – Text Transmission
For the transmission of short text messages. Longer text messages
may be transmitted by using multiple sentences.
$--TXT,xx,xx,xx,c--c*hh<CR><LF>
Field No. Format Description Remark
1 xx Total number of sentences
2 xx
Sentence number
3 xx Text identifier
4 c--c Text message
5 c—c Function reply status
VDM – AIS VHF Data-Link Message
This sentence is used to transfer the entire contents of a received
AIS message packet, as defined in ITU-R M.1371 and as received on
the VHF Data Link (VDL), using the “six-bit” field type.
!--VDM,x,x,x,a,s—s,x*hh<CR><LF>
Field No. Format Description Remark
1 x
Total number of sentences needed to transfer the
message
2 x
Sentence number
3 x Sequential message identifier
4 a AIS channel
5 s—s Encapsulated ITU-R M.1371 radio message
6 x Number of fill-bits
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