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I bought a DB9 tester -- lights up to show activity for each pin. If EFIS and wiring are working properly what activity should I expect to see on the tester?

Another note: It previously was working correctly and was detected therefore wiring should be correct. I do have power at the unit on the right pins. Also no OAT indication. Slight burned smell at the EDC. Cooked? Dynon says to buy a new unit as they do not repair the EDC out of warranty.

Thanks :)

Hi -- my remote compass is not detected. Did try firmware reinstall, no luck. So 1. How best to check for wiring issues at the remote compass site? 2. How best to determine is EDC-10A is faulty? Appreciate any tips on the least painful way to do this. Thanks Ron N450PR Kerrville, Texas

Just to clarify. The EFIS has been working fine when first installed and I was able to do the remote mag cal, etc. So unless the wiring has failed in the last year??? Anyway, I should get the new cable tomorrow and will try again.

I have a unit that was installed 4 years ago -- upgraded to E10A in 2005. For whatever reason when I tried to upgrade the firmware/software today, the EFIS is not detected by the Dynon Support Program. I reinstalled the Radio drivers and the PC sees the USB to serial port connector. I just...