Lowrance NEP-1 Operation Instruction
Pub. 988-0170-011
NEP-1
Navico Expansion Port
This document will show you how to install a Navico Expansion Port (NEP-1). The NEP-1 has five Ethernet ports used to share a variety of information — including sonar and radar data — with multiple display units, depending on the capability of the display unit.
The NEP-1 comes packed with a fuse, an inline fuse holder and a 6' power cable.
Navico Expansion Port (NEP-1).
Tools and Supplies
Required tools include: drill, drill bits, Phillips screwdriver. For thruhull installations, you also will need a 5/16" (8mm) wrench.
Required supplies differ depending on how you are going to install the NEP-1 (thru-hull or self-tapping). None of the required supplies are included with your NEP-1.
Thru-hull installation:
•No. 6 (3.5mm) stainless steel machine screws (4)
•No. 6 (3.5mm) stainless steel screw lock-washer nuts (4)
•5/32" (4mm) drill bit
Self-tapping installation:
•No. 6 (3.5mm) self-tapping, stainless steel screws (4)
•No. 6 (3.5mm) lock washers (4)
•7/64" (2.5mm) drill bit
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2.26in (57.5mm)
7.76in (197.0mm)
8.27in (210.0mm)
6.89in 
(175.0mm)
7.40in 
(188.0mm)
Installation
1. Select a location for NEP-1 installation that will allow desired display units to connect to the NEP-1 without kinking, stressing or tangling Ethernet cables.
NOTE:
Install the NEP-1 module and power cable at least 3 feet away from your VHF radio antenna to prevent interference.
2. Place the NEP-1 against the installation surface. Mark pilot hole locations through the ears at each corner of the module.
Caution:
You should read the entire installation section before drilling any holes in your vessel!
3.Remove the NEP-1 from the installation surface. Using the pilot hole marks as a guide, drill the pilot holes. If you are using a thru-hull installation, you will need a 5/32" (4mm) drill bit. For self-tapping installations, use a 7/64" (2.5mm) drill bit.
4.Align the NEP-1 with the pilot holes and install the screws.
If you are using a thru-hull installation, you will need No. 6 stainless steel machine screws and stainless steel lock-washer nuts. For selftapping installations, use No. 6 self-tapping, stainless steel screws with lock-washers.
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Power Connections
The NEP-1 has four wires; red (+), black (–), yellow and blue. The red wire is positive, the black wire is the ground and the yellow wire connects to a switch. The blue wire will not be used. Cap the end of the blue wire with a wire nut or electrical tape.
Yellow wire to switchbox
Blue wire
not used
Black wire (–) 
to battery (–)
Red wire (+) to inline fuse to battery (+)
1.Insert the supplied fuse into the fuse holder. Attach the red positive wire (+) to the fuse holder.
2.Connect the wire on the other end of the fuse holder to a wire connected to the positive battery terminal (+).
Fuse holder |
Fuse |
3.Attach the black ground wire (–) to the negative battery terminal (–).
4.Connect the yellow wire to a switchbox. Refer to your switchbox instructions for more information.
NOTE:
If you connect the yellow wire directly to the battery (always-on configuration), you will have to disconnect the NEP-1 from the battery when your boat is not in use; otherwise it will run down the battery.
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