D180 and 696

[Ratman]

I was wrong about the "Fast" and "Normal" settings though. Seems that the same sentences are sent and they are sent at 9600 baud at both "fast" and "normal". When choosing NMEA the description and speed of what is being sent changes with the two settings.

Just an update for future readers and for those that actually know or care what these sentences are. I was wrong, about being wrong. :-?

The descriptions listed in the settings menu on the 696 don't change when you choose "normal" or "fast" but the sentences actually do change. From the manual:

NMEA Sentence Output:
• Normal Mode: GPRMB, GPRMC, GPGGA, GPGSA, GPGSV, GPGLL, GPBWC, GPVTG, GPXTE, GPBOD, GPRTE, GPWPL, GPAPB, PGRME, PGRMZ, PGRMM, and PGRMH.
• Fast Mode: GPRMB, GPRMC, PGRMZ, and PGRMH

Rat

 

[PhantomPholly]

The 496 can output NMEA and SL30 commands on the SAME serial port. It's "NMEA & VHF out."

When in this mode, both come out the same serial port. The HS34 is smart enough to then pass on only the SL30 commands to the SL30. You can also just wire the SL30 and the HS34 in parallel, since the SL30 is smart enough to ignore the NMEA info, but if you do this, the HS34 can't set the course on the SL30.

You are correct, only the 296 actually has two serial ports. The 396 and above used this port for the weather receiver. The 396 pilot's guide we have doesn't list a pinout for the second port however.

Thank you for that clarification:  the HS34 will forward applicable channel information to the radio, splitting it off from the GPS data in the NMEA output stream.  

 

[Ratman]

Thank you for that clarification:  the HS34 will forward applicable channel information to the radio, splitting it off from the GPS data in the NMEA output stream.  

Just to be clear, it's not the NMEA output stream. The HS34 isn't stripping data from the NMEA output stream and sending the VHF data to the radio, NMEA doesn't have the VHF data. The selection you need to make on your 496 isn't "NMEA" instead select "NMEA & VHF out". Two different options altogether.

Choosing the correct output option on your 496 might solve the problem of the 496 talking to the GNS480 although I doubt it. Garmin states in the 496 and 696 manual, "The GPSMAP can also output frequency data to a Garmin aviation radio. Currently the two models supported are the SL30 nav/comm and the SL40 comm" (page 154 of the 496 manual http://www8.garmin.com/manuals/GPSMAP496_OwnersManual.pdf). Looks like it isn't a limitation of your Dynon equipment it's your GNS480 that can't understand the output.

 

[PhantomPholly]

Thank you for that clarification:  the HS34 will forward applicable channel information to the radio, splitting it off from the GPS data in the NMEA output stream.  

Just to be clear, it's not the NMEA output stream. The HS34 isn't stripping data from the NMEA output stream and sending the VHF data to the radio, NMEA doesn't have the VHF data. The selection you need to make on your 496 isn't "NMEA" instead select "NMEA & VHF out". Two different options altogether.

Choosing the correct output option on your 496 might solve the problem of the 496 talking to the GNS480 although I doubt it. Garmin states in the 496 and 696 manual, "The GPSMAP can also output frequency data to a Garmin aviation radio. Currently the two models supported are the SL30 nav/comm and the SL40 comm" (page 154 of the 496 manual http://www8.garmin.com/manuals/GPSMAP496_OwnersManual.pdf). Looks like it isn't a limitation of your Dynon equipment it's your GNS480 that can't understand the output.

That is possible. I do suspect that since both were Apollo radios and since there is an SL-30 INPUT mode on the 480 (at least in the latest software release which I don't have yet) that it might work.

I'll report back once I get the software update installed.