P-9
DSC – Digital selective calling information
$--DSC,xxxxxxxxxx,xx,xx,xx,xx,xx,x*hh<CR><LF>
| | | | | | | |
| | | | | | | +------- 8
| | | | | | +--------- 7
| | | | | +----------- 6
| | | | +-------------- 5
| | | +----------------- 4
| | +-------------------- 3
| +----------------------- 2
+------------------------------ 1
1. Maritime mobile service identity(MMSI)
(see note 3)
2. Format specifier(see note 2)
3. Categry(see note 2)
4. Nature of distress(see note 2)
5. First telecommand(see note 2)
6. Second telecommand(see note 2)
7. Acknowledgement type(see note 1)
8. Checksum
NOTES
1 Acknowledgement type:R - Acknowledge RQ
B - Acknowledge BQ
S - End of sequence of EOS
2 Last two digits of symbol number described in ITU-R M.493-6, Table 3.
3 MMSI of the called station for a DSC call to be initiated; MMSI of the
calling station in a received DSC call.
DSE – Expanded digital selective calling
$--DSE,x,x,a,xxxxxxxxxx,xx,c--c,.......,xx,c--c*hh<CR><LF>
| | | | | | | | | |
| | | | | | | | | +------- 8
| | | | | | | +--+----------- 7
| | | | | | +--------------------- 6
| | | | +--+--------------------------- 5
| | | +------------------------------------- 4
| | +-------------------------------------------- 3
| +---------------------------------------------- 2
+------------------------------------------------ 1
1. Total number of messages
2. Message number
3. Query/reply flag
4. Vessel MMSI
5. Data set '1'
6. Additional data sets
7. Data set 'n'
8. Checksum
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