I have a similar setup on my own boat but have two off 17X one of which has a switch in the power supply so I can switch over to that one if the other goes down. The 4008 comes with quite a long so called drop cable for the 17x that is actually over the length specified to be N2K compliant for a drop but works OK, a better way is to place the 17x right at one end of the backbone using an inline terminator (very cheap) which is both compliant, works and frees up a “T” from the 4008 Kit for use on another drop and use another inline terminator for a device at the other end of the backbone thus requiring two less Ts than would otherwise be the case, you will still be left with future flexibility using that method. One point worth mentioning is that most Garmin stuff comes with quite a bit of N2K cabling, terminators and “Ts” so you may not need to go down the barrier strip route at all. What you can do at the chart table will depend on a number of things and a cheap N2K plotter plotter sans Antenna may be the way to go as it will take it’s feed from the bus, but you will have to check the particular unit’s spec to see what it is capable of displaying. The Garmin kit will all plug and play so no problems there, the 17x GPS puck supplied with the 4008 will feed all GPS data direct to the bus so the Garmin stuff will all use that data, as will any other stuff like wind, depth, water speed sensors. The ring terminals are the same as any normal electrical ones but of a micro size to suit the barrier strip screws, available from the same place as the strips, possibly the supplier may call them lugs.
Here’s a barrier strip obviously you need the 5 pair type, they are available from here or your local Maplins & others. If you post precicely what kit you have connected I may be able to give a more meaningful answer. If one plotter goes down then you can always reinstate the transmit from the other one on the backbone. Take particular care if the "new" plotter has an N2K antenna as that will feed directly to the network and will be difficult to ignore.
Also if you know a friendly factory process engineer the stuff is all lifted from devicenet including cables and connectors so you may get some from such a source cheaper.Įdit as I didn’t see the second question, two plotters both complying to N2K could give a few issues but simply shut the transmit down on one so all the other kit on the backbone only has one set of data to work with, many instruments will allow you to select the "source" of information they use and you could also go down that route if the facility is available. As an authorised NMEA 04 techie and member of the NMEA I can confirm that the use of barrier strips (not chocolate blocks) is and acceptable practise for installations to conform to NMEA2000, provided they are done propely with ring theminals and the junction is not in an exposed area.
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