L3 Technologies AIS Manual Do Utilizador
Marine Systems
Aviation Recorders
Rev. 02 Page 3--9
July 29/03
Automatic Identification System
3.1.2.
Connecting the IEC Data Interface Cable
The AIS Transponder receives data from the ship’s sensors through a data interface
cable which is connected to the back of the transponder through a data port. IMO
regulations require that the ship heading, speed--over--ground (SOG), course--over--
ground (COG), rate--of--turn (ROT) and position be transmitted from the AIS. In or-
der to meet these requirements, the L--3 ProTec provides six (6) data channels to
allow the AIS to be connected to the ships Gyrocompass and DGPS system in ac-
cordance with NMEA 0183.
cable which is connected to the back of the transponder through a data port. IMO
regulations require that the ship heading, speed--over--ground (SOG), course--over--
ground (COG), rate--of--turn (ROT) and position be transmitted from the AIS. In or-
der to meet these requirements, the L--3 ProTec provides six (6) data channels to
allow the AIS to be connected to the ships Gyrocompass and DGPS system in ac-
cordance with NMEA 0183.
The L3 AIS is shipped with one IEC interface cable P/N 024--M0088--01. All IEC/Pi-
lot communications with the AIS is referenced with the L--3 ProTec considered the
“MASTER” in that transmit data is OUTPUT from the L--3 ProTec, and receive data is
INPUT to the L--3 ProTec. All channels are isolated with individual shielded twisted
pair cables. Refer to Figure 3--7. The IEC connector (J4) is located on the back of
the L--3 ProTec. (Refer to IEC 61993--2 annex D. and NMEA 0183) IEC channels 1,
2, and 3 are RECEIVE ONLY sensor inputs. Differential data (RS422) is received on
each of these channels and internally converted to TTL for input to a standard
UART. Channels 4, 5, and 8 are all RS422 interfaces. IEC channels 4 and 5 are
TRANSMIT/RECEIVE channels for AIS data. IEC channel 8 is the AIS long range
port.
lot communications with the AIS is referenced with the L--3 ProTec considered the
“MASTER” in that transmit data is OUTPUT from the L--3 ProTec, and receive data is
INPUT to the L--3 ProTec. All channels are isolated with individual shielded twisted
pair cables. Refer to Figure 3--7. The IEC connector (J4) is located on the back of
the L--3 ProTec. (Refer to IEC 61993--2 annex D. and NMEA 0183) IEC channels 1,
2, and 3 are RECEIVE ONLY sensor inputs. Differential data (RS422) is received on
each of these channels and internally converted to TTL for input to a standard
UART. Channels 4, 5, and 8 are all RS422 interfaces. IEC channels 4 and 5 are
TRANSMIT/RECEIVE channels for AIS data. IEC channel 8 is the AIS long range
port.
3.1.2.1
Data Channels
Data enters the Transponder through six (6) available data channels.
Three data
channels are low speed unidirectional (4800 baud) channels suitable for data input
to the transponder. The other three data channels are high speed bidirectional
channels (38400 baud) which support both input and output to/from the transponder.
to the transponder. The other three data channels are high speed bidirectional
channels (38400 baud) which support both input and output to/from the transponder.
The channels are described below by channel number and type. Suggested uses of
each channel are provided but it is not required that a user define the channels in
this fashion. The internal software in the transponder is able to distinguish the type
of data feeding from each channel provided all data streams subscribe to the IEC
61162 format (NMEA 0183).
each channel are provided but it is not required that a user define the channels in
this fashion. The internal software in the transponder is able to distinguish the type
of data feeding from each channel provided all data streams subscribe to the IEC
61162 format (NMEA 0183).
Table 3--1. Data Channels
Channel
BAUD
Type
Suggested Use
1
4800
Receive
DGPS (COG, SOG, LAT, LON)
2
4800
Receive
Rate of Turn
3
4800
Receive
Heading (Gyro)
4
38400
Transmit / Receive
PC Application
5
38400
Transmit / Receive
ARPA/ECDIS
8
38400
Transmit / Receive
Long Range Tracking (Dedicated)