Dynon rx and tx with vp-x

[dynonsupport]

Sorry, I didn't mean to insinuate that operating without an antenna was a good practice or OK with other equipment. Just in this specific case, with this specific transponder, you don't need to worry about that. Just trying to save the poster some hassle in determining his issue.

Unless the manufacturer specifically states that it's OK, as Walt and Bill say, never operate a transmitter without an antenna or dummy load connected.

[southtarnation]

Good to know gentlmen, thanks for the info.

[southtarnation]

Originally Posted by dynonsupport;

The simplest thing to do is hook one of the TX wires to the RX wire on the SkyView. This creates a "loopback." Set up this port as VP-X or Transponder. If the SkyView is transmitting, then the RX counter should increase. If something is broken, then the RX will not.

Tried the above test today...

Set serial one in the dynon to vpx and loop backed the tx and rx. It incremented on both, so not a dynon issue. Tried serial 2 loopback and got tx and rx incrementing. Ok. So triple checked mire diagrams and wires and re-connected serial set 1 to the vp-x turned it all on and still have the same issue of the vpx not incrementing on the rx side.

Is there anything else that could cause this aside from a hardware issue with the vpx?

I have everything wired up except the comm and xcom, any panel switches (stick switches wired up) or anything on the "back" engine side of the ems module. The ems is connected to the the display though. Servos are connected hut trim is not yet.

It would seem like and i would rather it be me and a wiring mistake than a brand new out of the box piece of hardware that im staking my safety on for a big part...

Thanks for any feedback.

[Bill.Peyton]

Jesse,
Have you loaded a configuration file to the VPX? Have ou connected a computer to the VPX Ethernet port. Btw, only the top port is enabled? If you have it connected, is it communicating properly with the VPX? Is your equipment connected to the VPX and more importantly, does it have power?
Bill

[southtarnation]

Originally Posted by Bill.Peyton

Jesse,
Have you loaded a configuration file to the VPX? Have ou connected a computer to the VPX Ethernet port. Btw, only the top port is enabled? If you have it connected, is it communicating properly with the VPX? Is your equipment connected to the VPX and more importantly, does it have power?
Bill

Yes config file loaded vie laptop and ethernet cable.

Top port? On the vp-x? Yes im using/did use the correct ethernet port on the vp-x.

It did communicate/connect once i shut the wifi off. Then i uploaded my config file.

Yes power to the main power bolt on the vpx which causes the dynon to then come on. I have the orange light on the vpx, dynon screen works, has gps fix even...

Any more ideas? And thank you for your help.

[Bill.Peyton]

I'm sure that you have set up the configuration of the ports on the dynon for the correct speeds etc. I am not familiar with the dynon, I am using the VPX with the g3x. I know you have probably already checked, but do you have the serial lines wired correctly. I am assuming you used 2 conductor shieled and have the shield terminated properly. Are you reading the connector pins correctly? Did you ring out the wires by actually touching the connector pins end to end? Did you check for a short from the conductors to the shields?
There is always a chance that the rs232 IC in the VPX is bad, but unless improper power was applied to it, I would doubt it. When you did the loop back test did you actually loop the wires from the VPX connector back to the dynon. Try running 2 new wires from the dynon to the VPX crimp new pins at both ends.
I don't have any more ideas. Send the VPX back and heave them verify the serial port is working properly
Bill

[southtarnation]

Originally Posted by Bill.Peyton

I'm sure that you have set up the configuration of the ports on the dynon for the correct speeds etc. I am not familiar with the dynon, I am using the VPX with the g3x. I know you have probably already checked, but do you have the serial lines wired correctly. I am assuming you used 2 conductor shieled and have the shield terminated properly. Are you reading the connector pins correctly? Did you ring out the wires by actually touching the connector pins end to end? Did you check for a short from the conductors to the shields?
There is always a chance that the rs232 IC in the VPX is bad, but unless improper power was applied to it, I would doubt it. When you did the loop back test did you actually loop the wires from the VPX connector back to the dynon. Try running 2 new wires from the dynon to the VPX crimp new pins at both ends.
I don't have any more ideas. Send the VPX back and heave them verify the serial port is working properly
Bill

Im not aware of the need or the abuility to changes speeds and dont recall it mentioned wirh regards yo the Dynon. Ill look into that, maybe you are onto something I missed.

Im confident that i have the 3 wires hooked up correctly. Tx to rx and rx to tx. The ground is confirmed to be good and also wired up correctly. I did noy use shieleded 3 wire though, I used 3 seperate 18g wires.

For the loopback test, i disconnecged the vpx harness the housed the serial 1 rx and tx wires from the dynon. I removed the wires for tx and rx from the dynon out of the vpx harness and hooked them together with the dsub pins still attached the ends. I then loacted and gested serial set 2 directly off the sv harness since no other wires were connected to them yet. In both cases i found that the tx and rx incremented. Tried set 1 and set 2 again with the serial connection for the set being tested set to the vpx within the dynon setup with the same results. Tx but no rx when connected to the vp-x.

Thanks for your input!

[Bill.Peyton]

Jesse,
You should always use twisted, shielded wire for all of the connections with the exception of power. The shields should always incorporate a single point ground, that is, only grounded at one end, unless specified otherwise. Does the dynon have a separate return (gnd) for their 232 ports?
I will make a suggestion that you have an avionics tech take a look at your harness
Page 4-15 of the sky view install man shows how to configure the serial port
Bill

[southtarnation]

Originally Posted by Bill.Peyton

Jesse,
You should always use twisted, shielded wire for all of the connections with the exception of power. The shields should always incorporate a single point ground, that is, only grounded at one end, unless specified otherwise. Does the dynon have a separate return (gnd) for their 232 ports?
I will make a suggestion that you have an avionics tech take a look at your harness
Page 4-15 of the sky view install man shows how to configure the serial port
Bill

The vpx man has the ground from port 22 being hooked to the two grounds from the the skyview harness, cant remember the port numbers, but it is per the manual.

Section 4-15 specifies to choose the manufacture of the equipment being hooked up if available, which the vp-x is. It autopopulates the settings and cannot be changed once selected.

Im sure you are correct about using twisted shielded, it would mean adding wire to the sv harness, length i dont need. As it is i put pins right on the serial wires from the dynon and plugged them directly into the vpx harness. There is a ground on each harness that needed to be hooked together so i dont think it was applicable to use shielded.

Is it even possible that the wires not being shielded could cause my issue? I would have to start deconstrcting the sv harness to make it shielded, twisted the whole way...

I pulled the vpx and will see about sending it back. If anyone wants to offer to look at my harness though, another set of eyes would never hurt and ill buy lunch. Planes in south lakeland.

[Bill.Peyton]

Did you purchase the harness from someone, or build it yourself?