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SECTION TWO: Installing and wiring the 958
Page 8 958 Installation Manual, Rev. A1
Electrical power requirements
Power source
The 958 is a negative-ground system that’s reverse-polarity protected. Power requirement is 10 VDC
minimum to 36 VDC maximum with at least 16-gauge connecting wire.
Connecting the 958 to ship’s power
The 958 ships with a 10-foot power cable that you can lengthen to a maximum of 25 feet:
•
for a cable length up to 15 feet, the power connections must use 16-gauge
connecting wire or heavier
•
for a cable length from 15 to 25 feet, use 14-gauge connecting wire or heavier
TABLE 2: Interface connector functions
Connector name Connector function(s) Connects to...
NMEA (NMEA I/O)
(18-pin port)
NMEA 1 input/output -------------->
NMEA 2 input/output -------------->
Honk alarm/200 ppnm ------------>
NMEA devices: radar, autopilot, etc.
Same as NMEA 1
Remote honk alarm (or speed indicator)
GPS (Antenna)
(7-pin RS232 port)
GPS/WAAS input/output --------->
Beacon input/output -------------->
2201 or 2301 GPS antenna
- or -
Northstar 2701 beacon receiver (optional)
AUX (Auxiliary)
(6-pin auxiliary NMEA
port)
RS-422/NMEA input/output -----> Northstar 490 echo sounder (optional)
- or -
A second 958 (or to a Northstar 957/952/
951/941) to transfer waypoints and routes
PWR (Power) Power 10 to 36 VDC, 50 watts
VGA (15-pin port) Video output Remote display
VIDEO (coaxial) Video input Any NTSC-compatible device
CAUTION!
As a good safety practice, Northstar strongly recommends
that you connect the 958 to a circuit breaker or 20-amp fuse
at the power source (battery).