![]() ![]() Heck, you could just use the Micro ports for all the connections, though it would be a bad idea to leave the Mini port contacts exposed (fine Turck male RKF-MC and female RSF-MC closure caps are available surplus, and there are probably many alternatives if you can find them).īy now you’ve probably realized that yours truly spent part of his winter collecting components for an N2K network that may be heavy duty enough to run a serious assembly line, but before discussing further, let’s look at a couple of mistakes. I’m also demonstrating how you can check for the proper 60 Ohm resistance across the white and blue data wires, because you may recall that NMEA 2000 is an impedance-driven networking technique. In this case the JBBS is the entire backbone with 7 female Micro connectors ready to accept drops up to 6 meters long each. But in the photo above, I’m using one Mini to insert 12v power with terminating resistors screwed into the other Mini and one Micro port. So the Turck JBBS 57-811 junction box is designed with male and female Mini ports for the network trunk and 8 Micro female ports for device drops. ![]() Apparently, that’s also a common connector architecture for industrial automation, which explains the design of the Turck junction box and the preponderance of Mini size cabling when searching eBay for DeviceNet cable listings. I’ve only seen the misnamed Mini connectors - they’re 7/8-inch in diameter - on large vessels, generally used for the trunk or backbone cabling with Micro drops to the various devices. Recall that N2K includes two five-pin connector sizes, generally called Mini and Micro and perhaps best seen on this Maretron page. ![]() ![]() But on a happier note, I’m pretty sure that the eBay purchases above constitute a small, high quality NMEA 2000 network at a bargain price. It turns out that there are many forms of DeviceNet, and several of them are useless for N2K. The cable and connector standard adopted for NMEA 2000 is a subset of the DeviceNet standard used in industrial automation, and if you try to equip your boat with used or surplus DeviceNet gear found online, the term “subset” will take on new meaning. ![]()
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