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APPENDIX 4 DIGITAL INTERFACE
AP-7
Serial interface I/O circuit
Input/Output Buffer
Sentence description
Input sentences
AIQ-AOIS query
BBM-AIS broadcast binary message
RS422_TD
RS422_RD
NMEA_RD
SN65LBC179DR
COM_TD_B
COM_TD_A
COM_RD_B
COM_RD_
A
GND
470Ω
110Ω
PC400
2.2kΩ
$--AIQ,ccc,*hh<CR><LF>
| |
| |
| +------------------------------ 2
+------------------------------------- 1
1. Query data
2. Checksum
!--BBM,x,x,x,x,x.x,s--s,x*hh<CR><LF>
| | | | | | | |
| | | | | | | +--- 8
| | | | | | +------ 7
| | | | | +--------- 6
| | | | +------------- 5
| | | +---------------- 4
| | +------------------ 3
| +-------------------- 2
+---------------------- 1
1. Total number of sentences needed to transfer the message, 1 to 9
2. Message sentence number, 1 to 9
3. Sequential Message identifier, 0 to 9
4. AIS channel for broadcast of the radio message
5. VDL message number(8 or 14), see ITU-R M.1371
6. Binary data
7. Number of fill-bits, 0 to 5
8. Checksum