[CA] [CA11] SeaTalkNG to NMEA2000 Connection

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum Hank,

Q1. The connection between NMEA2000 and STNG is done with a blue/white backbone cable that has a devicenet connector spliced on the NMEA2000 end.
A1. For clarification, Raymarine does not produce a blue/white SeaTalkng Backbone Cable. SeaTalkng Backbone Cables are blue/black and SeaTalkng Spur Cables are white/black. Much as I believed you have described a backbone which has been constructed from SeaTalkng networking components may be interfaced to a NMEA 2000 backbone which has been constructed from third party NMEA 2000 networking components. Please click here to view a FAQ addressing this subject.

Q2. As part of the upgrade I want to replace this with the appropriate cable and adaptor.
A2. Until such time as Raymarine introduces a SeaTalkng Backbone to DeviceNet Adapter Cable (hopefully in 2020), the solution specified within the FAQ referenced above should be employed.

Q3. Both networks have their own power connections and I have been told that NMEA2000 networks should only have one power connection.
A3. Correct.

Q4. Considering the original interface cable was customized (power not passed through?), will I need to disconnect one of the power supplies (NMEA or STNG?) if the original cable is replaced with adapter / cable?
A4. Yes. Any SeaTalkng Backbone to DeviceNet Adapter Cable introduced by Raymarine will likely pass all five leads of the cable from plug to plug. When the cable splice was made, it was likely that the ground and power leads of the cables were not spliced together.