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Network wiring sanity check for new Simrad system?

Old 10-02-2014, 03:08 PM
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Default Network wiring sanity check for new Simrad system?

I just purchased a complete Simrad system for my Nordic Tug, and would sure appreciate some feedback before I start in with the installation. I've spent quite a bit of time going through manuals and reading posts here, so hopefully I've got the basics understood.

The new components: Simrad NSS12 evo2, 4G RADAR, Autopilot package (AP24, RC42, AC12, RPU80, RF300) and GoFree WiFi.

Existing equipment is an Airmar B117 transducer and a Standard Horizon GX2100. The transducer might get upgraded down the road, but I've already tested it using the B60 config in the NSS12 and it works fine for basic sonar. AIS/GPS will be transferred between the GX2100 and the NSS12.

The hardest part of my install will be the routing of the wiring...I've extremely limited space to feed wires between certain locations, so I need to make sure I'm running things as efficiently as possible without running afoul of any specs. Specifically, the N2k and Simnet portions are not perfectly clear to me.

The N2K connections directly to the multijoiner seem obvious enough. I'm hoping I can run a Simnet cable between the R110 RADAR interface and one of the Simnet ports on the AP24, then a Simnet/Micro C adapter cable from the second AP24 Simnet port to a N2K tee to bridge the two networks. Hopefully, the following diagram illustrates more clearly what I have in mind.

Anything obvious I've missed with this setup?

Old 10-02-2014, 04:32 PM
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Whew. First off, where is your N2K getting power? And the Tee to AP24 to R110 isn't right. And you show R110 getting power from multi joiner? Is SimNet multi joiner a 7 port?
Old 10-02-2014, 06:07 PM
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Default Simnet and N2K diagrams

Perhaps this may help. Simrad has some options. You can Simnet or NMEA 2000 Micro-C.


Old 10-02-2014, 08:39 PM
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Originally Posted by offshraddict View Post
Whew. First off, where is your N2K getting power?...

...And you show R110 getting power from multi joiner?
Sorry - primitive drawing tools/skills, I see the confusion.

Everything red will be individually fed/fused via 12V somewhere - none of the places those lines intersect are meant to be connections. NSS12, WiFi, RI10, AC12 and one of the N2K ports on the 4-way will each be terminated at a fuse block or switch.

Originally Posted by offshraddict View Post
And the Tee to AP24 to R110 isn't right.
I see that now...posts by islandmarinetech clear that up. Basically, it looks like I abandon Simnet and go straight N2K via adaptor cables for both the AP24 and RI10.

Originally Posted by offshraddict View Post
Is SimNet multi joiner a 7 port?
Nope - 4 ports. Has 6 connectors as shown in the diagram above by islandmarinetech.
Old 10-02-2014, 09:04 PM
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Originally Posted by islandmarinetech View Post
Perhaps this may help. Simrad has some options. You can Simnet or NMEA 2000 Micro-C.
Helps a bunch, Steve - thanks. I'm only missing a single Simnet to Micro C adaptor cable for the N2K example you listed.

Likely a dumb question that I think I know the answer to, but I'll ask anyway...

The N2K example you listed won't work for me given my planned physical layout of the components. However, I'm assuming the placement of the 5 components and 12v power can be anywhere along the N2K bus, correct? That is, as long as the termination stays as shown, it doesn't matter where the 12V is supplied, nor which components are connected to the two tees or 4 ports on the multiport?

Basically, if I switch the AC12 and AP24 in your example - I think I can make that layout work.

And lastly - there are two Simnet ports on the back of the AP24. Should I use either one for the Micro C adaptor cable, and leave one empty? Or does some sort of termination need to happen on the unused port?
Old 10-02-2014, 09:54 PM
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As long as you keep the backbone structure proposed by islandmarinetech (one terminator at each end) you can configure the drop cables and connected equipment as you prefer.

There is a yellow blind plug coming with AP24 to avoid water coming to the unused SimNet connector. The dual SimNet connectors are intended for daisy chaining, for SimNet daisy chaining is allowed but just within the backbone, not the drop cables. For standard NMEA 2000 daisy chaining is not allowed.
Old 10-02-2014, 10:58 PM
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Why are you complicating the system by using any N2K? just keep it all Simnet, the SH is NMEA 0183 so that won't need a N2K set up. Never mind, I see you bought the N2K version of the autopilot

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