iFly GPS Forum

Received my new ifly on Thursday and have now desk-flown it quite a bit - loving it. Went out the hangar today and installed it in my RV6 in place of my now defunt Lowrance 2000c. No problem with power hook up but no joy with getting NMEA output to my Dynon D10A EFIS.

I purchased your USB to serial converter cable. Per the documenation I understood that Pin 5 was ground and Pin 3 was the GPS Output (Tx). I know that the EFIS expects input on pin 3 so thought I was all set. FWIW, on the Output cable I had previously made up for my Lowarance I had actually only installed pins 5 and 3 and that worked fine - i.e. pin 3 data / pin 5 ground was exactly what I wanted. Have tried selecting Basic, Extended and advanced but the EFIS isn't getting anything. Any ideas?

I'm just after one way - Pin 3 is EFIS receive/GPS NMEA output, Pin 5 Ground. The cable I had previously made up for my Lowrance worked fine. As shown in the picture below I had actually only installed pins 3 and 5 in the plug on that one. It was purely one way GPS Tx / EFIS Rx on Pin 3.

It read as if your cable would provide exactly the same. GPS NMEA out on Pin 3, ground on Pin 5. That should be all I need - just doesn't work. To clarify your question regarding bi-directional, per the EFIS manual EFIS output to Nav/GPS is on Pin 2 not three and as you can see from the above picture I didn't even bother installing a Pin 2 on my last set-up so I honestly don't think that's the issue.

FWIW when it didn't work, I temporarily reconnected the old GPS with the above pictured cable and it works fine. So I conclude that either (i) ifly is not sending data or (ii) the cable doesn't work..?

I'd like it to work as my Dynon EFIS is also the autopilot and it used to happily follow the GPS around!

The Lowrance was set to 9600 baud and the following sentences (everything it offered) were on - GLL, GGA, APX,RMC&RMS, GSA&GSV

Dynon manual is here www.dynonavionics.com/downloads/Insta... See page 10 for wiring harness. You'll see the DB9 connector for serial port or GPS input on Pin 3.

Any help/ideas greatly appreciated.

I hadI tried both with actual gps lock and waypoint and with simulator-no joy either way