Installation: The Display Unit - NorthStar Multi-Function Unit M121 Installation And Operation Manual

Connections
M121
1

20-3 Installation: The display unit

Start by selecting a suitable mounting position
for the M121/M84 display unit:
• Consider the best possible position for
viewing and operating the M121/M84. This
will generally be a relatively shaded area free
from obstructions.
• At least 4" (100 mm) away from the compass,
at least 12" (300 mm) away from any radio
transmitter and at least 4 ft (1.2 m) away
from any antenna.
92
2 3 4 5
Northstar M121/M84 Installation and Operation Manual
q Sonar
w Video in
e Comms
r GPS
t Fuel/Nav - Northstar Fuel TXD
y Radar
u u Power/data cable
Wire
Black
Brown
White
Blue
6 7
Red
Orange
Yellow
Green
• For optimum performance and reliability
consider mounting the unit where it will not
be unnecessarily exposed to direct sunlight,
water and protected from other physical
damage which could occur during rough
sea passages.
• If bracket mounting chose a flat area where
the display will not be subjected excessive
vibration.
• Select an area with adequate clearance for
cabling and access to the power source.
• Before drilling any holes ensure that
the drill area is free from cables or other
obstructions.
Sonar Transducer
Video Input
(Analogue composite
[NTSC-PAL])
Not Used
Northstar 124 GPS Antenna
- SmartCraft Gateway
Northstar Radar Processor
Function
Ground: power negative,
NMEA ground (Connect both
black wires to ground)
Not Used
NMEA out
NavBus-
Positive power in, 10
to 35 V DC
NavBus+
Auto power - Connect to red
wire (positive power in) to
enable Auto power No Auto
power - Leave disconnected
or connected to Black
wire (ground)
External Alarm output or light
out, switches to ground
during alarm condition,
200 mA maximum.