Mapping NMEA2000 instance numbers to descriptive instances

[jkross]

How can I map from the NMEA instance number (from Actisense EMU-1) to the descriptive values "port", "starboard" etc.? Particularly for instance 2 which is generated from the EMU-1 for my generator data.

I thought this was being done in the derived data plugin, but I tried adding a third value of "generator" to the list so it reads "port, starboard, generator" and my deltas just come out with propulsion.2.* instead of propulsion.generator., while the main engines report measurements of propulsion.port. etc.

[sbender9]

You can use the path-mapper plugin to rename it.

[jkross]

Thank you - works beautifully

[KenAlbert47]

Hi jkross, I have a spare EMU-1and a generator with no telemetry. What did you manage to connect to the EMU from the genset?
Any hints? Cheers

[jkross]

My generator is a Northern lLghts. It has senders for oil pressure and coolant temp, and a battery voltage dial. I connected these three to the EMU-1. Since I don't have a tachometer on the generator I generate an hour meter from the oil pressure sender using the hour-meter plugin for signalk (https://github.com/joelkoz/signalk-hour-meter/<https://github.com/joelkoz/signalk-hour-meter/tree/master>) Jonathan

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________________________________ From: KenAlbert47 ***@***.***> Sent: Tuesday, April 29, 2025 12:21:43 AM To: SignalK/signalk ***@***.***> Cc: jkross ***@***.***>; Author ***@***.***> Subject: Re: [SignalK/signalk] Mapping NMEA2000 instance numbers to descriptive instances (Discussion #177) Hi jkross, I have a spare EMU-1and a generator with no telemetry. What did you manage to connect to the EMU from the genset? Any hints? Cheers — Reply to this email directly, view it on GitHub<#177 (reply in thread)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AE5XI62SEJKJZJCNUK2CK43234SAPAVCNFSM6AAAAAB35B57ISVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTEOJXG43DENY>. You are receiving this because you authored the thread.Message ID: ***@***.***>

[KenAlbert47]

Very nice! - I have an Onan. I'll have to check out what I can get from it.