User Manual for AIT2500 V1.01
TEL + 44 1179 554474 www.digitalyacht.co.uk
Installation Step 3 - Power
•
Provide power connections to the unit. Power is connected to the eight core PWR/DATA cable on the Red and
Black wires. The Red wire is the positive (+) connection. The Black wire is the negative (-) connection.
•
Connect the stripped wires to the nearest source of primary 12V or 24V DC power. Ensure that the supply is
connected via the supplied 3A fuse or suitable circuit breaker. Add the fuse in the positive power connection to
the unit if necessary.
•
The AIT2500 Class B+ Transponder is designed for a 12V or 24v DC systems.
Installation Step 4
– NMEA 0183
•
The AIT2500 can be connected to other AIS compatible equipment via the NMEA0183 connections on the
PWR/DATA cable, via the NMEA 2000 interface cable and/or to a PC via the USB interface.
•
A table showing what each of the 12 wires of the PWR/DATA cable does is printed on the AIT2500 Transponder
and repeated below for your convenience;
Wire colour
Description
Function
RED
Power in +
Power supply connections
BLACK
Power in -
B
LUE
Switch input-
External switch connection for silent mode
WHITE
Switch input+
ORANGE
NMEA0183
port 1 TX+
High speed NMEA0183 output (38,400 baud) intended for
connection to chart plotters
BROWN
NMEA0183
port 1 TX-
TURQUOISE
NMEA0183
port 1 RX+
High speed NMEA0183 input (38,400 baud)
Not normally used
GREY
NMEA0183
port 1 RX-
PINK
NMEA0183
port 2 TX+
Low speed NMEA0183 Output (4,800baud) intended for
connection to other NMEA0183 devices requiring a GPS
feed. Note AIS data is not available on this output.
VIOLET
NMEA0183
port 2 TX-
YELLOW
NMEA0183
port 2 RX+
Low speed NMEA0183 input (4,800baud) intended for
connection to other NMEA0183 compatible sensors for
multiplexing of data to the chart plotter
GREEN
NMEA0183
port 2 RX-
•
The most common connection to a dedicated chart plotter is to take the NMEA Output 1 ( and Brown
–)
from the AIT2500 Transponder and to connect it to a free NMEA Input on the plotter. You must then tell the chart
plotter that AIS data is connected to this port and set the baud rate to 38,400 Baud
– the standard speed for AIS
data. Consult the instruction manual supplied with your Chart Plotter to understand how this is configured.
•
The AIT2500 has a second NMEA 0183 output that can be used to pass GPS data to a VHF radio or instrument
system. NMEA Output 2 transmits GPS data at 4800 baud
– RMC, GGA and GGL sentences.
•
NMEA 0183 data from other equipment can be connected to either of the NMEA Inputs of the AIT2500, although
this is most commonly connected to NMEA Input 2 ( and Green-) at the normal 4800 baud rate for NMEA
0183. This data is then multiplexed with the AIS data and output on the NMEA Output 1 at 38,400 baud and also
on the USB
– useful when connecting to equipment that only has one NMEA input.
