[CA] NEMA 2000 with ST60 and ST4000+

[Chuck - Raymarine - Moderator]

Greg,

I have the following two comments regarding your diagram:
- the power insertion spur for the SeaTalkng / NMEA 2000 backbone should be located at the approximate midpoint of the backbone's LEN load. The power insertion spur shown within your diagram is located at the extreme left end of the backbone.
- the diagram should be annotated to specify that red lead within the SeaTalk cable which is connected to the ST4000+ must be severed to prevent the ST4000+ from supplying power to the SeaTalk bus.
- the diagram should more clarify the MFD to be an Axiom 9 DV MFD (may be directly interfaced to the specified transducer) or Axiom 9 RV MFD (may be adapted to be interfaced to the specified transducer) rather than an Axiom 9 MFD. Additionally, should the vessel engage in blue water operation or operated under conditions which may not be satisfactory for reliable interaction with a touch screen (ex. operating the MFD with a wet screen, or operating under rough, slamming conditions), then it would be recommended that an Axiom Pro MFD or RMK-10 be considered to provide buttons and UniController to better interact with MFD under such conditions.

Regarding powering the ST4000+, the ST4000+ is not designed to be powered by a SeaTalk bus. Instead, it is recommended that the ST4000+ be powered via a dedicated power circuit supplying power to the ST4000+'s power terminals.

Regarding recommendations for marine electronics power circuits, please click here to view a FAQ addressing this subject. While technically possible to power the MFD and SeaTalkng / NMEA 2000 backbone from the same power circuity (using appropriately rated fuses for the MFD and backbone) the best practice for powering the marine electronics circuits is specified within the referenced FAQ.