Ni300x nmea interface unit, Installation – Simrad AUTOPILOT SYSTEM AP50 User Manual
Page 113

Installation
20221032B
111
NI300X NMEA Interface Unit
The NI300X NMEA Interface Unit is normally installed inside 
of a console or locker close to navigation receivers, radar, and 
instruments to keep the cables short. The unit does not have 
controls that need to be operated during installation or use, but 
you should be able to take the lid off for inspections and to view 
LED indication of received signals. It should be installed with 
the cable inlet and the RobNet connectors facing down. The 
NI300X is designed to operate in locations with temperatures 
below +55°C (+130°F). It is fastened to the panel/bulkhead by 
the external mounting brackets. 
Note !
The NI300X is not weatherproof and must be installed in a dry 
location! 
TB11
TB11
Fu
ru
no
SIMRAD
FURUNO
RADAR
DISPLAY
+12V
EXTERNAL
STAND ALONE
IS15 INSTRUMENT
RX+
RX-
TX+
TX-
DataH
DataC
N.C.
Clk H
Clk C
RX+
RX-
TX+
TX-
IS15 INSTRUMENTS
LORAN C
OUTPUT FOR RADAR, 
INSTRUMENTS ETC.
MAX 250 mA
BLACK
GPS
NME
A
2
NM
E
A
3
NME
A
4
NME
A
1
TB7-A
TB7-B
GPS OR 
PLOTTER
RED
+
_
12V DC
OUT
RED
BLACK
SIMRAD
IS15 EXPANDER
SIMRAD
SIMRAD
SIMRAD
Alar
m
RX+
RX-
TX+
TX-
RX+
RX-
TX+
TX-
TB6
TB5
TB4
TB3
TB2
TB1
TB8
ALARM
OUTPUT
(Normally open)
Figure 4-41 NI300X NMEA Interface Unit Connections
