Differences

This shows you the differences between two versions of the page.

--- nmea2000 [2024/08/11 21:47] – river
+++ nmea2000 [2025/04/30 18:37] (current) – river
@@ Line 2: / Line 2: @@
 Notes about this standard. Buying it costs 4000 or maybe 8000 USD, if they feel like selling it to you. [[https://web.nmea.org/atlas/forms/general/11|NMEA standard order form]]
+===== Rebrands =====
+The following are NMEA2000, or close enough, but with different connectors.
+  * Raymarine SeaTalk2. Older Raymarine standard.
+  * Raymarine SeaTalkNG. Newer. "SeaTalk NG is Raymarine's cabling system used to carry NMEA 2000 data."
+  * Simrad Simnet
+  * Furuno CAN
 ===== Data =====
@@ Line 18: / Line 27: @@
 Physical layer is based on [[https://web.archive.org/web/20070128083016/http://www.odva.org/Portals/0/Library/Publications_Numbered/PUB00026R1.pdf|DeviceNet]] - notably the Micro-C connectors.
+==== Cable ====
+Cable sold for NMEA 2000 is very expensive. Cable sold for DeviceNet is less expensive but still a lot. Normal ethernet (Cat 5 etc.) cable would probably work. It is 100 Ohm nom., and NMEA 2000 is meant to be 120 Ohm, but it's probably close enough, particularly for short networks as expected on a boat. Calculated SWR of 100 to 120 ohm connection is 1.2 / ~21dB return loss.
+Possibly suitable:
+  * BELDEN 3084A
+  * LAPP KABEL 2170343 - Multipair Cable, Per M, DeviceNet Field Bus, Data Pair 24 AWG+ Power Pair 22 AWG, Screened, 2 Pair
+  * MOLEX / FLAMAR 155421-5001 - Networking Cable, Flamar® Profinet Type C, Screened, Cat5e, 22 AWG, 0.34 mm², 328 ft, 100 m
+Actisense NMEA 2000: https://www.tcschandlery.co.uk/actisense-micro-nmea-2000-cable-per-metre/p21018
 ==== Colours ====
-| Grey | Shield |
+| Standard Colour | Use | Colour of wire in M sockets I have |
-| Red | NET-S Power |
+| Grey | Shield | Brown |
-| Black | NET-C Ground |
+| Red | NET-S Power | White |
-| White | NET-H  |
+| Black | NET-C Ground | Blue |
-| Blue | NET-L  |
+| White | NET-H  | Black |
+| Blue | NET-L  | Grey |
 Micro size cables should be Power: 22 AWG, Data: 24 AWG.