Dynon rx and tx with vp-x

[DaveO]

Jesse,
Have you done a continuity check on the lead in question? Also,it sounds like the pin of that lead may not be making contact in the female connector. If that checks out ok, try changing to a different set of tx and rx wires. Ex. instead of # 1 use # 2 or 3.
I had to change one of mine to another set of wires.
Dave

[southtarnation]

Originally Posted by Davoakes@att.net

Jesse,
Have you done a continuity check on the lead in question? Also,it sounds like the pin of that lead may not be making contact in the female connector. If that checks out ok, try changing to a different set of tx and rx wires. Ex. instead of # 1 use # 2 or 3.
I had to change one of mine to another set of wires.
Dave

Yes, I've done continuity checks from harness to harness and it checks out good.
I looked at the pons and they are all seated and the proper length inside each connector.

I also tested (loopback) serial lines 1 & 2. Both checked out so i first tried set 1 again with mo joy and then set 2 with the same results.

Thanks though,
Jesse

[MCA]

Here's a few thoughts Jesse:

You mention the use of individual 18 AWG wires. The standard size (size 20) d-sub connectors used on the VP-X and SkyView are designed for 20-24AWG wire, so you probably had to cut a few strands off to make it fit in the connectors. While 18 AWG will work electrically, we recommend using 20, 22 or 24 AWG 3 conductor shielded wire. The three wires carry RX, TX, and serial ground. The shield is wired to the airframe ground per standard practices. The shielding reduces the chance of interference from everything from nearby wires to radars, etc. So it'll probably work most of the time. In any case, the 18AWG wire is not the source of your specific problem herein, but may be a problem in the future.

You can connect the Configurator to the VP-X and under the System Info page look next to the 'External Data Missing' field. If there is an exclamation point symbol then it is not receiving the SkyView data. However, there is no way to perform a loopback test.

We'd be glad to look at the VP-X for you if you think the wiring is ok. Just send it in with a note explaining the issue and where to send it back.

[southtarnation]

Originally Posted by MCA

You can connect the Configurator to the VP-X and under the System Info page look next to the 'External Data Missing' field. If there is an exclamation point symbol then it is not receiving the SkyView data. However, there is no way to perform a loopback test.

We'd be glad to look at the VP-X for you if you think the wiring is ok. Just send it in with a note explaining the issue and where to send it back.

Got out to the hanger today and ran the configurator utility...
Next to the "external data field" there IS an exclamation mark in red flashing. When i hovered the mouse over it, it popped up a short message saying it was not getting data from the efis.

Aside from the wiring and aside from any hardware issue; are there any settings that could be causung the issue. A friend suggested checking to see that the baud rates matched. Im pretty sure that when vpx is selected on the Dynon serial set up page that thenspeeds and other serial connection fields/settings are pre-filled out and grey out indicating the settings cannot be changed. Are there settings within the vpx to set the speed for the serial connection to the efis?

I am changing the n number of the plane and though maybe i entered different numbers on the dynon vs the vpx but checked and they are the same.

If there is nothing left i can check or do, I guess ill return the unit for your team to lookover.

[dynonsupport]

Do you have your AHRS hooked up to the EFIS and showing attitude already? This is where all the data we send to the VP-X comes from, and if it's not there we won't be sending it.

You cannot select the baud rate on SkyView or the VP-X, it's all automatically configured.

[southtarnation]

Yes ahrs is hooked up and gps too.

[Bill.Peyton]

Jesse,
Does the AHARS display proper information and does the screen show airspeed etc. Does the GPS show your location. In general, is everything working with the Dynon except showin the VPX data? Are you absolutely sure your grounds are correct> I looked at the install manual and it appears that the ground (return) on the vpx is pin J1- 21, earlier you mentioned pin 22, are you sure you have the pins correct
J1-21 gnd
J1-22 Rx
J1-20 TX
And on the Skyview, use any pin 21-24 for the ground

From their manual:

Notes on SkyView installation:

?

TX = transmit port, RX = receive port, GND = ground.

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Use any open serial port pair on SkyView.

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Use any GND pin 21-24 on SkyView.

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Use 3 conductor shielded wire. Solder wires together within d-sub
hood and cover with heat shrink. Run single wire into d-sub pin.

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The SkyView has two power pins on the display. These two
power pins are simply to spread the load of a single power input
across two power pins. These two power inputs must be soldered
together into a single power wire. DO NOT wire each power pin

on the SkyView to its own power pin on the VP-X. (see diagram

[southtarnation]

Unfortunately, yes I'm sure. I may have misspoke in the post earlier as i was posting from memory. I have (and 3 others) verified that ports 20-22 are correct.

Everything you specified from the man was done with the exception of the shielded wire. Lol, which i see you put in bold.

Thanks for your help.

[Bill.Peyton]

but do you have the ground from j1-22 on vpx over to skyview pin 21-24? the serial port needs a return path to work. You caught me on the shielded wire, it really is important for good consistent operation.

[southtarnation]

Yes ground is hooked up as you say. I dont recall which ground port i used on the dynon though.