GRT Support?

[Jesse]

I have been trying for hours to get ahold of GRT to answer a simple question about the ARINC module for their Sport EFIS. I have left messages and have called probably 20 times and can't get a soul to answer the phone. Maybe someone on here can help.

The installation page for the ARINC module has two wires to hook up to the Sport serial port 4 in and out, and two wire to hook up to serial port 4 in and out. I know it sounds like the same thing, but that's what it says. Does anybody know what the second two wires are supposed to do?

Any help would be appreciated.

[Bavafa]

I don't know the answer to the question but I did talk to them a couple of days ago inquiring about upgrade. It took a couple of tries to get the hold of them.

[Rupester]

Anytime they were not able to answer the phone and I left a message, they always called me back. (tho' occasionally the next day).

[BobTurner]

Jesse, on the GRT web site, naviate to "misc documentation", find external ARINC.
The box uses a serial port on the EFIS, and then replicates that port so it's still available. So one pair of in/out wires goes to the EFIS. The other pair is for external use. The documentation referenced above says which is which.
The perils of a small company: one guy probably took off the Friday before a three day weekend.

[Mel]

Originally Posted by BobTurner

Jesse, on the GRT web site, naviate to "misc documentation", find external ARINC.
The box uses a serial port on the EFIS, and then replicates that port so it's still available. So one pair of in/out wires goes to the EFIS. The other pair is for external use. The documentation referenced above says which is which.
The perils of a small company: one guy probably took off the Friday before a three day weekend.

To elaborate on Bob's post, Pin 3 on the module goes to the EFIS Serial 4 out. Pin 4 goes to the EFIS Serial 4 in. Pins 8 & 9 give you an additional Serial I/O.

[Jesse]

Originally Posted by BobTurner

Jesse, on the GRT web site, naviate to "misc documentation", find external ARINC.
The box uses a serial port on the EFIS, and then replicates that port so it's still available. So one pair of in/out wires goes to the EFIS. The other pair is for external use. The documentation referenced above says which is which.
The perils of a small company: one guy probably took off the Friday before a three day weekend.

I see how their paper could mean that, but it was certainly not as clear as you said it. Thanks!

[BobTurner]

Jesse, Do you have the "Rev E" drawing (from the web page referenced above)?
There are some complaints about GRT documentation, but quite honestly this looks pretty clear to me.