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| LeCroy 3034 - how to set up ARINC429 data display? |
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| peter-h:
I have two ARINC429 analysers - old ex Ebay stuff from MAXT. One is PCMCIA in a winXP laptop, and the other is a PCI card in my PC (which is much more solid). These have loads of features; I can load e.g. an AHRS decode package and have the the labels all decoded. And generate all kinds of simulation data. I wasn't expecting that level of support on a scope. Just a display of the 1s and 0s in the 32-bit packet. I've written a load of ARINC429 code, using a HI3593. I was keen to see if this scope can be made to do decoding. It may just be handy one day, but probably not since the UI on these scopes is only just usable on "normal" signals (the touch screen is completely useless, so I use a trackball) and IME the main benefit of a DSO is the storage aspect of it. It can of course display the data (see screenshot below) but that is as far as I can get - no analysis. ARINC429 doesn't appear under the trigger options, which include all sorts like CAN STD etc. But that would be complicated; you really need the huge library of label formats to trigger on values, because the values vary per label. And there are many cases of the same label having different meanings. I also wondered if the Decode 2 option (my last post above) might work, since it has no clock/cs options, just data. But no luck with that. Probably the problem is that I have no info on how to use any of these features. For example what does Configure Table do? |
| tautech:
What are ch3 and 4 ? Doesn't look like they're related to a data bus. :-// Turn them OFF. You have Stop'ed the scope which is symptom you don't have stable triggering. The packet is 5 div long so set trigger Timeout for slightly longer than the packet to get stable triggering. Then I'm lost as never seen a packet with positive and negative pulses. :-// Ch2 looks like a CS or is it just a fluke it aligns with a series of negative pulses ? |
| peter-h:
I did that but it makes no difference. The reason I stopped the scope is because the transmitting device is sending out about 20 different packets, so triggering, while possible, is pretty difficult, and data analysis must be possible on captured data (I've seen it done with SPI). Checking and unchecking the View Decode very much changes the display; it makes it update much slower, as if the scope was looking for something. The data is what ARINC429 looks like. -5V to +5V swing. |
| tautech:
--- Quote from: peter-h on December 26, 2021, 08:29:36 pm ---I did that but it makes no difference. The reason I stopped the scope is because the transmitting device is sending out about 20 different packets, so triggering, while possible, is pretty difficult, and data analysis must be possible on captured data (I've seen it done with SPI). Checking and unchecking the View Decode very much changes the display; it makes it update much slower, as if the scope was looking for something. The data is what ARINC429 looks like. -5V to +5V swing. --- End quote --- OK thanks, never seen it before. Is Ch2 related, see edit to previous post. Decode ON can slow system performance in some scopes so it's important to get all the little things right and ensure you have other unused features OFF. My first rule when trying to do any decoding is to get stable triggering which might be with the trigger set to another bus related channel which is why you don't want any other signals present to confuse the issue. :horse: After some quick Googling it seems like using Zoom mode to better see the packet timing structure looks like a good place to start. https://teledynelecroy.com/serialdata/serialdatastandard.aspx?standardid=319&capid=105&mid=520 |
| Martin72:
I´m curious about the Arinc source.. |
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