Samyung ENC SI-30A, Manual Instruction

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6-3-25 TXT – text transmission
This sentence is used for transmitting text messages such as alarm messages from a sensor
or the transponder to any presentation display device such as the SI-30A Display unit.
$--TXT ,xx ,xx ,xx ,c--c *hh<CR><LF>
① ② ③ ④
① total number of messages ② message number
③ text identifier ④ text message
6-3-26 VBW – Dual ground/water speed
S—VBW ,x.x ,x.x ,A ,x.x ,x.x ,A ,x.x ,A ,x.x ,A *hh<CR><LF>
① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩
① Longitudinal water speed ② Traverse water speed
③ Status: water speed ④ Longitudinal ground speed
⑤ Traverse ground speed ⑥ Status: ground speed
⑦ Stern traverse water speed ⑧ Status: stern water speed
⑨ Stern traverse ground speed ⑩ Status: stern ground speed
Longitudinal ground speed – used Transverse ground speed – used
Status of ground speed – used Other fields ignored
6-3-27 VDM – VHF data link message
This sentence is output by the transponder each time it receives an incoming message over
the VHF data link. The VDM sentence encapsulates a part of an M.1371 message, and several
VDM sentences may need to be decoded and re-assembled in order to re-construct the
original M.1371 message.
!--VDM ,x ,x ,x ,a ,s—s ,x *hh<CR><LF>
① ② ③ ④ ⑤ ⑥
① total number of sentences needed to transfer message
② sentence number
③ sequential message identifier
④ AIS Channel ⑤ encapsulated ITU-R M.1371 radio message
⑥ number of fill-bits
6-3-28 VDO - AIS VHF Data-link own-vessel report
This sentence is output to all the presentation ports at regular intervals and contains the
contents of the transponders own-vessel report. Each time the transponder transmits an
own-vessel report, it encapsulates the M.1371 message in one or more VDO sentences and
outputs them on its presentation ports.