I'll be very pleased to be corrected !
Cant wait to get back to my boat now. Maybe I can get my course computer to output and input NMEA after all.
It could be that the device in question (Raymarine chartplotter) can output its data as NMEA - which is good, but doesn't necessarily mean that it will act as a protocol converter for ALL Seatalk data on the bus.
I noticed that MWV and VWR are not in the list of filtered sentences suggesting that it does not output them; so, unless the wind instrument also has an NMEA output (my ST50 doesnt), you wont see wind data in Openplotter
Cant wait to get back to my boat now. Maybe I can get my course computer to output and input NMEA after all.
(2017-06-29, 03:57 PM)abarrow Wrote: The only thing you can do at this point is to attach the NMEA output of your C80 to an RS422(or RS485 or RS232) USB interface on your PI or even to a laptop, configure in incoming serial port, and then use diagnostics to see what data is actually being sent out that port. As I said, my ST-60 display has an outgoing NMEA port, and I can see depth and magnetic heading coming out. I agree that the part about showing an RS232 interface in the installation manual is confusing - as you say they show nmea to a radio as via an RS232 converter. I don't understand why they don't show that connection as coming directly from the C80's NMEA port.
I looked at the C80 manual here: http://raymarinec80.com/wp-content/uploa...Manual.pdf
On page 186 there are instructions for "NMEA Output Setup" that allows filtering of the following sentences: APB, BWC, BWR, DBT, DPT, GGA, GLL, MTW, RMA, RMB, RMC, RSD, RTE, TTM, VHW, VLW, VTG, WPL, ZDA. That would indicate to me that if those sentences are not filtered, they are sent out that port. That is somewhat consistent with my ST-60, which sends out DBT and HDM sentences (those are the only sensors on my ST bus right now), both of which are created elsewhere on the Seatalk bus. Having said all that, I found that the NMEA sentences coming out of my ST-60 lacked checksums and complete information, which Openplotter didn't like even when I turned off the checksum requirement on the port. There's a discussion elsewhere on this forum about using Node-RED to add those checksums and the rest of the information. Again, this is a good reason for testing the stream coming out of the C80 first, before laying out the money for a protocol converter.
It could be that the device in question (Raymarine chartplotter) can output its data as NMEA - which is good, but doesn't necessarily mean that it will act as a protocol converter for ALL Seatalk data on the bus.
I noticed that MWV and VWR are not in the list of filtered sentences suggesting that it does not output them; so, unless the wind instrument also has an NMEA output (my ST50 doesnt), you wont see wind data in Openplotter