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GRT ARINC
Andy,
I've been through this, I chased the same issue for some time. I was sure I had everything wired correctly yet GRT tech support kept telling me the likely issue was a wiring issue. I went through the settings with Todd at GRT and confirmed they were correct. Full disclosure; I did have a switch in my setup as I have a TruTrak A/P and can drive the A/P from the 430 or the Sport SX. I ended up tracing the wires all the way from the ARINC to the 430, I assume you are connecting a 430. Turned out to be 1 wire flipped at the switch. Drove me absolutely nuts for weeks. |
Andy,
I may have taken you down a blind road. Your ARINC module must be connected to serial port 4 in and out on your EFIS. That is pin ARINC pin 4 to EFIS pin 33 and ARINC pin 3 to EFIS pin 37. Also the ARINC module requires 12 volts on pin 5 and ground on pin 1. The test Bob suggests will test if the wiring is correct. I take it you are using this to drive your autopilot. The settings I listed in the previous post are to interface a GNS430 to GRT EFIS. You should have connections to pin 5 and pin 9 of the ARINC plug (on the top of the box) going to your autopilot. Have you asked Jesse for help? He is very helpful. Jim Butcher |
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I also have a toggle switch to flip flop between two GPS signals. One is the GRT EFIS, and the other is a G3X on the copilot's side. But I presume the G3X isn't a problem because I had the switch on the GRT side the whole time. |
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I'm going to get a good look at the wiring and then call GRT back for a long talk. I should have all the facts I need at that point about the wiring and how the setup is currently configured. |
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Andy,
One last thought. Be certain that the power for the ARINC module and the EFIS come on at the same time. At one point I had two different power sources and if the ARINC was not powered when the EFIS booted, I got the ARINC not detected message. Jim Butcher |
OK, I'm back. I traced all the wiring on Sunday and I wonder if I have found a problem tonight while looking at all the pictures I took. Everything seems to check out (in my mind) except one wire. My installer referenced the EFIS serial port 4 input as hole 33 on the 37 hole plug. It receives the orange wire in my plug pic below. If I am not mistaken the wire in in plug 32 instead???
The yellow wire that runs from the ARINC back to the EFIS is supposed to be in hole 37, which is the serial port 4 output. I think this wire is fine as is. All other wiring seems to be correct between the EFIS, the ARINC, and the TruTrak A/P. I looked at the sample wiring diagram GRT has for a dual EFIS setup but if you ignore the actual intended system, it DOES reference pin 33 as (SL-30) Serial 4 Rx and (SL-30) Serial 4 Tx as pin 37 (so the serial 4 input and output). So I guess my installer was on the right track but maybe put the orange wire one hole away from where it needs to go??? What do you guys think??? Thanks!! Andy ![]() |
It looks like you found the problem. Pin 3 on the ARINC should go to pin 37 on the screen. Pin 4 on the ARINC should go to pin 33 on the screen.
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Bingo
Andy,
I agree with Jesse. I believe you have found this problem. Wiring issues drive me nuts.:eek: |
Thanks guys. I'll be away from the plane for a week or so but will report back.
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