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LeCroy 3034 - how to set up ARINC429 data display?

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peter-h:
I also feel fairly sure that zoom is needed to get any data analysis to work.

The source is a Sandel SG102 AHRS. Why do you think this is relevant? It is just a standard low speed ARINC source. I have a few of them kicking around. But I also have the two analysers (PCMCIA & PCI) which can generate any packet, with a specified rate. So, yeah, I can set up one of these to generate just one packet, repetitively.

It still doesn't do anything.

tautech:
Peter, in a packet what is the normal first edge ? Positive or Negative ?
From what I see in your screenshot the scope is triggering on the 4th first positive edge within the packet.

Not that should be a concern if it repeatedly triggers and as long as it's stable and other settings correct you should get a decode.
Do you have a 'display decode' setting ?

Martin72:
Hi,


--- Quote ---Why do you think this is relevant?
--- End quote ---

No, not relevant - Just for me, haven´t heard from this before.


--- Quote ---It still doesn't do anything.
--- End quote ---

If the scope doesn´t got the decode protocol in "real", and it seems so, it won´t do anything.

peter-h:
Triggering is basically easy if there is a gap between packets. Same with any scope. This is not an issue.

And usually there is a substantial gap.

To do it really properly, i.e. assuming no inter-packet gap, you have to decode the data. The encoding can be found online; I have never bit-banged it; I've always used a chip to do that. It may be somewhat similar to Manchester, which I have done in hardware many times since the 1980s. If you are doing ARINC429 on the cheap (not common because the other end usually costs 4 digits, but if you need say 10-20 channels then it will get very expensive very fast unless you DIY, and an FPGA is a popular solution) then you can bit-bang the TX easily enough (the specific slew rate is the only slight challenge), and you can bit-bang the RX with a comparator feeding a GPIO pin.

I think there is something "big" missing here. Either the scope doesn't support it despite having the software key in there, or there is some config item missing. Look at that thread about the 3034 FFT being completely useless unless a key item of knowledge is implemented :)

There is a display decode option - see earlier screenshots. It is "trying" to do something.

nctnico:
Why not first try to decode something the oscilloscope is supposed to support like (I guess) UART, I2C or SPI? Now you are tracking 2 problems at once. You can split that into 2 seperate problems by first getting something to work that should work for sure.

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