Filter
Top Products
SECTION TWO: Installing and wiring the 957
957 Installation Manual, Revision C1 Page 15
Electrical power
requirements
Power source
The 957 is a negative-ground system that’s reverse-polarity
protected. DC power is required from a 10-volt minimum to a
36-volt maximum using at least 16-gauge connecting wire.
Connecting the 957 to
ship’s power
A 10-foot power cable is shipped with the 957 system. You can
lengthen this cable 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
If you lengthen the power cable, use an external fuse at the
battery end as an added safety precaution. The fuse size
should match the size of the wiring on the vessel. See the
NMEA or the American Boating and Yachting Counsel
specifications to find the correct fuse to use with your cable.
For the best protection from noise, connect the power cable
directly to the battery or dedicated electronics buss. The green
ground wire should be connected to ship’s ground directly.
AUX (Auxiliary)
(6-pin auxiliary NMEA
port)
RS-422/NMEA input/output -----> Northstar 490 echo sounder (optional)
- or -
A second 957 (or to a Northstar 952/951/
941) for the waypoint-and-route transfer
function
PWR (Power) Power 10 to 36 VDC
VGA
(15-pin port)
Video output Remote display
VIDEO
(coaxial)
Video input Any NTSC-compatible device
Table 1: Interface connector functions (continued)
Connector name Connector function(s) Connects to...
CAUTION!
As a good safety practice, Northstar strongly
recommends that you connect the 957 to a circuit
breaker or 20-amp fuse at the power source
(battery).