Transas T214, Technical Manual

Page: 103 / 115

Main and Aux presentation ports
Chapter 8. Communication Protocol.
101
9.1
MAIN AND AUX PRESENTATION PORTS
Specific AIS station functions are accessible via two functionally identical interfaces
i.e. Main and Aux. Communications protocols are text, but quite non-readable
sentences which contain compressed binary data: requests, acknowledgements,
messages etc.
9.2
STANDARD SENTENCES
The sentences transmitted and received through this interface are described in IEC
61993-2 (Annex G) and in the “IALA Recommendation A-124 on AIS Shore Stations
and networking aspects related to the AIS Service”. Realization features are dealt
with in the following subsections.
AIS Base Station T214 receives/transmits messages 1-22 according to ITU-R
M.1371-1 and messages 23, 24 – according to IEC 62287-1.
Depend on Access Scheme (see 6.8.3) “
I
” – independent, “
D
” – dependent AIS
Base Station T214 supports on presentation ports the input/output sentences
formatters listed in Table 3.
Table 3. AIS Base Station T214 Input/Output Sentences Formatters
Sentence
Formatter
Input
“
I
”
Input
“
D
”
Output
“
I
”
Output
“
D
”
Description
ABK X
Addressed and binary
broadcast
acknowledgement
ABM X
Addressed binary and
safety related message
ACA X Q
AIS Regional Channel
Assignment Message
ACM X
Preparation and
initiation of an AIS
Base Station broadcast
of an Addressed
Channel Message (VDL
message 22)
ACK X X Acknowledge Alarm
ADS X X
AIS Device Status
(output once per minute
and upon status change)
AGA X
Preparation and
Initiation of an AIS
Base Station broadcast
of a Group Assignment
Message (Message 23).