2021-04-05, 04:19 PM
Hello,
I know this is quite a newbie question but i've tried everything and it's driving me mad.
I have a chart plotter (Gamin GPSMap 520s) with depth transducer, which is working just fine. Also, i have the NMEA0183 output connected to the VHF radio, which is working fine too (VHF radio gets gps coordinates).
On the other side, i have Rpi4+Moitessier HAT 2 with OpenPlotter, and i bought this RS-422/RS-485 to USB adapter:
https://www.amazon.es/gp/product/B07B416...UTF8&psc=1
From the VHF instruction manual, i can tell that red wire is NMEA+ and blue one is NMEA-. But i have no clue how to connect those to the USB adapter. I know that if i connect the red wire to pin 1 (RS485 A+) or 3 (RS422 RXD+), the RXD LED starts flashing, making me think that is "receiving something". I've tried connecting the blue wire to RXD- and GND. Now that i think about it, i might have not tried connecting to B-, but i don't know if i should be using 422 or 485 for this 2-wire connection.
So problem 1: Correct wiring
In OP's "Serial" app, the device is properly detected. So i have assigned an alias, and set the data as NMEA0183. Moved to Connections tab, add to SignalK, selected "Auto", and one.
Then in SignalK the device appears, but isn't sending any data. I've tried several baud rate options (though i'm not sure which one should i use to be honest) without success.
So problem 2: Correct configuration
Any help will be greatly appreciated, and please let me know if i can provide more details, pictures, or anything else. The end goal, as you can imagine is to have the same (and more) information in OP as I have in the chart plotter, while keeping it there because for now is the most stable solution, and the depth is the last "mandatory" data missing.
Thanks!
I know this is quite a newbie question but i've tried everything and it's driving me mad.
I have a chart plotter (Gamin GPSMap 520s) with depth transducer, which is working just fine. Also, i have the NMEA0183 output connected to the VHF radio, which is working fine too (VHF radio gets gps coordinates).
On the other side, i have Rpi4+Moitessier HAT 2 with OpenPlotter, and i bought this RS-422/RS-485 to USB adapter:
https://www.amazon.es/gp/product/B07B416...UTF8&psc=1
From the VHF instruction manual, i can tell that red wire is NMEA+ and blue one is NMEA-. But i have no clue how to connect those to the USB adapter. I know that if i connect the red wire to pin 1 (RS485 A+) or 3 (RS422 RXD+), the RXD LED starts flashing, making me think that is "receiving something". I've tried connecting the blue wire to RXD- and GND. Now that i think about it, i might have not tried connecting to B-, but i don't know if i should be using 422 or 485 for this 2-wire connection.
So problem 1: Correct wiring
In OP's "Serial" app, the device is properly detected. So i have assigned an alias, and set the data as NMEA0183. Moved to Connections tab, add to SignalK, selected "Auto", and one.
Then in SignalK the device appears, but isn't sending any data. I've tried several baud rate options (though i'm not sure which one should i use to be honest) without success.
So problem 2: Correct configuration
Any help will be greatly appreciated, and please let me know if i can provide more details, pictures, or anything else. The end goal, as you can imagine is to have the same (and more) information in OP as I have in the chart plotter, while keeping it there because for now is the most stable solution, and the depth is the last "mandatory" data missing.
Thanks!