XJT Module

[Charliechan]

Received a FrSky XJT module and X8R a week ago. Plugged the XJT into the 9XR and using the X8R on a Quad build I'm working on. Question for the forum, "Has anyone worked through the telemetry wiring for this setup to use with the FrSky modules"? If nothing else the capability for on-screen monitoring of voltage and amps. I think the XJT is designed for external use on the Taranis as it is labeled as Telemetry on the back and the X8R will be the airborne mate. So it is solder time since my old Telemetrz won't work here and I just read that Mr. Mack is not producing a Teley board for the 9XR. Any ideas.

[MikeB]

Even if wired (logic level inverter on pin 5) you will also need updated firmware as the XJT uses SPort protocol for the telemetry data. I'm working on this at present and have a test version, posted on another thread, pretty much working.

Mike.

[Charliechan]

Great Mike, if you new a tester on firmware I have a model flying with this hardware.

[Charliechan]

Provided I can flash the XJT, I use the FrSky USB-b on the DJT.

[backman8571]

i am interested to do the same

[MikeB]

You need to do the telemetry mod, using an inverting buffer from pin 5 (bottom pin) of the module connector, re-routing the THR and AIL switches as well. Er9x supports the XJT module using PXX and SPort, no mods or flashing of the XJT mopdule are needed.

Mike.

[backman8571]

Mike

Do you have a link of how to do the mod's

I see it for the 9X but not for the 9XR

Regards

Per

[MikeB]

I don't, I've not actually done the mod to a 9XR. The board looks much the same around the processor, so the mod should be very similar. You need to route pins 2 and 3 to pins 41 and 42 using 220 ohm resistors, then route the telemetry signal, after inverting it, to pin 2.

Mike.

[backman8571]

With the XJT module and mode do you know if you can get 16 ch support from that

Instead of using the DHT and DJT module's 8 + 8, i would like to use a module that support 16 like the XJT and the X8r receiver with sbus support

Anyone ??

Per

[MikeB]

Yes, you should be able to select D16 mode under PXX and get 16 channel support.

Mike.

[backman8571]

I tried that i can use all eight on receiver and i see signal going to the sbus but i can only control ch 9-12 13-16 no luck

Same hookup and sbus converters work fine on 13-16

I also see one more strange issue

Senario 1.

Put XJT in the 9XR and bind with a new X8R receiver

When bind that reciver to the Taranis internal module all well so far

But if you try to bind the receiver now to the XJT module on Taranis on 9XR it will nor rebind

So how can i unbind the transmitter

Per

[backman8571]

I have a question to the forum

If you use the XJT in combination with the Taranis internal .
And you bind the receiver first to the internal and when you try to move it to the external how can you do that

It will not unbind

I can move the XJT to my 9XR and i had first bind the receiver to 9XR but i could only get 12 out of 16 ch to work.
So i tried and moved the receiver to the taranis and did bind it fine and all 16 ch worked fine

I when tried to rebind it back to the 9XR but no luck permanent locked to Taranis internal.

Help me out with this 2 issue's

1 use ch 13-16 with sbus on 9XR

2 be able to rebind receiver after binded to the taranis main internal mode

Regards

Per

[MikeB]

But if you try to bind the receiver now to the XJT module on Taranis on 9XR it will nor rebind

I'm confused by this statement!

I was thinking you would be using two X8R receivers to get the 16 channels. However, I would still expect the SBUS to carry channels 9-16.

You should just be able to bind the Rx to either the Taranis, or the XJT in the 9XR, no 'unbinding' is necessary.

Please describe exactly what you are doing now to bind the Rx to the XJT in the 9XR.

Mike.

[MikeB]

On the 9XR, do you have the protocol set to PXX, and D16?
Are you then binding using the 'bind' option in the model setup?

Mike.

[backman8571]

D16

You dont have the PXX as an option on the Taranis

Per

[backman8571]

Like you say

Press the bind switch on the XJT module turn power on

Hold the bind key down on the receiver and connect power, waith 5 sec, then turn power of

Power on Radio wait to startup, then turn power on the receiver

You can see on the sbus module that the channels you have have sellect are working (you think) all the lights are on if programmed proper.

It works fine on the Taranis and you move the sbus to the 9XR and only 9-12 work's, makes no sense

Any idea ??

Per

[Kilrah]

More details please.

What receiver(s) are you trying to use?
What do you have the internal and external modules set to on the Taranis?

[Kilrah]

It seems you are using PPM to the XJT. This only supports 12 channels, you need tu use PXX for 16 and use the menu items instead of the back panel controls.

Please only use this thread for this discussion, it will become a nightmare if we have to try following 3. I moved your other posts.

[backman8571]

Clarification

1. when using the XJT on the 9XR i have it set to PXX give's me only 12 channels

2 with the Taranis
Internal set to D16 ch selection is 1-16

External (XJT) set to D16 ch selection is 17-32

[Kilrah]

1. when using the XJT on the 9XR i have it set to PXX give's me only 12 channels

With what firmware?

Envoyé de mon GT-I8190N en utilisant Tapatalk

[backman8571]

I am using oentx-r2834

eepr 215

[Kilrah]

As said PXX is NOT implemented in openTx for 9XR. When you select it it sends out PPM, hence the 12 channels.

And again, please concentrate your posts on the matter in a single thread.

[LTMNO]

Question....
On T9x-M128 running ER9x, what is the best you achieve with the XJT Module?
Does it have to be a Taranis to run properly? Will it work fully for the D16 setting using SBUS?

Thanks, I just see some latency on the APM Planner when viewing the response from the RC Transmitter. More than what I would expect.

[MikeB]

Pino: It should be fully functional, all 16 channels. Someone did a test on latency over on RCG. It seemed the XJT/X8R combination did have more latency than the DJT/D8R. This is probably due to both sending an RF packet every 9mS, but the DJT only has 8 channels to send each time while the XJT alternates between the first 8 channels and the second 8 channels.
How much latency are you seeing?
Do you know what exactly it is reporting?

Mike.

[LTMNO]

Hello Mike, Good Morning at in Canada right now
I will try to get the latency information but let me try to explain what i am seeing.
I have D16 setup currently with my APM Mini from HK. I am using FrSky SBUS to CPPM converter so that I can use 1 port on the Receiver and 1 port on the APM.
When you calibrate the radio for the APM as part of the pre-arming checks requirements, I am configuring the CH's for the Outputs along with the failsafes.
What I notice is that the Pulses are spiking and then dropping. So for instance if I full throttle on CH3 the Green indicator for PPM will be at 900 and spike to 2015 and then back to 900 while I am at full throttle. I suspect like with my other setups it should just stay at 2015.

Thoughts?

[MikeB]

Could be the SBUS to CPPM. Could you try plugging a servo into channel 3 of the X8R and seeing if that works correctly?

Mike.

[LTMNO]

Just tested the CH3 with a servo and it moves with the THR input as expected.. no latency and doesn't spike from High to Low. It stays at the position that is set in throttle.

[LTMNO]

Just another question..
Does the XJT Tx with the X8R Rx only work in D16 Mode?
Can you bind in D8 Mode on Tx and Mode 1 on the X8R?
Or
Do you you have to use D16 on Tx and pick between Mode 4 or (Mode 5, Default no Jumper) on the X8R

I guess I am a little confused to what I am seeing... I don't have the Telemetry setup... I am using the SBUS port to SUM up the PPM via the SBUS to CPPM Converter to the 1 input of CH1 on my APM.
This just prevents me to wiring CH1-CH8 from the Rx to the APM Inputs.

With this setup should I be seeing the Fluctuation in the Signal?

Does the TeZ board that we are discussing in this thread (viewtopic.php?f=5&t=5242&p=75814#p75814) have an effect on this? Even if I don't want to read Telemetry at this point.

[MikeB]

I think I did test both in D8 mode.
The TEZ board should have no effect on this.

Mike.

[LTMNO]

So I take it you can have the XJT with the X8R in D8 Mode?
The XJT Manual states that D16 is for X8R and not compatible with D8?
I am not sure if the manual means inclusive or exclusive