I really need some help figuring out how to make my Garmin 2210 and Furuno 585 communicate. Here's what I have done to date: wired per schematics, Garmin Blue to Furuno Yellow and Garmin Brown to Furuno White.
Adjusted Garmin unit, changed ports 1 and 2 to NMEA In/Out. Also turned off data sentences that were Garmin proprietary or not listed in the Furuno owners manual.
Adjusted Furuno unit, set to NMEA Ver 3.0; NMEA Port set to In/Out; NMEA Output set to On; WAAS Setup set to Off; TLL Output set to TLL
When the Furuno is in Demo mode, it is sending water temp and depth to the Garmin. When not in demo mode those data cells blink (no transducer hooked up yet).
However, the Furuno is not receiving any info from the Garmin. Switched Demo mode off, the lat and lon data fields are blank.
What am I missing?