Author Topic: Scope that can decode USB  (Read 14000 times)

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Offline abraxa

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Re: Scope that can decode USB
« Reply #25 on: August 26, 2017, 08:38:04 pm »
Thanks for all replies and suggestions. Let me reframe my original question;

What would I need to read or decode ASCII traffic coming from a USB 2.0 device. If for example, If I wanted to read XYZ data from a USB stepper driver, what would I need to do that?

If you just want to sniff the data, you could also use https://wiki.wireshark.org/CaptureSetup/USB to do this on the PC side.
 

Offline Titan 4380Topic starter

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Re: Scope that can decode USB
« Reply #26 on: August 26, 2017, 11:16:25 pm »
Thanks for your suggestions Leo. Its ironic that you should jump in on this thread, because it is one of your devices that I am also interested in monitoring to see how it can be implemented in other ways.Specifically, the BU0836X turned out to be an extremely reliable and robust unit, but I am convinced that its full potential has yet to be unlocked.
 

Offline Howardlong

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Re: Scope that can decode USB
« Reply #27 on: August 29, 2017, 03:10:07 pm »
 

Offline Leo Bodnar

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Re: Scope that can decode USB
« Reply #28 on: August 29, 2017, 03:29:57 pm »
Which ones offer external trigger (either in or out, but preferably both)?
http://teledynelecroy.com/protocolanalyzer/protocoloverview.aspx?seriesid=414&capid=103&mid=511
They sell a cable for it but it's just a standard DIN connector on the back. It is both IN and OUT.
https://store.teledynelecroy.com/products/ac032xxa-x-mercury-external-trigger-cable

Leo

« Last Edit: August 29, 2017, 03:37:04 pm by Leo Bodnar »
 

Offline Howardlong

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Re: Scope that can decode USB
« Reply #29 on: August 29, 2017, 07:31:04 pm »
Which ones offer external trigger (either in or out, but preferably both)?
http://teledynelecroy.com/protocolanalyzer/protocoloverview.aspx?seriesid=414&capid=103&mid=511
They sell a cable for it but it's just a standard DIN connector on the back. It is both IN and OUT.
https://store.teledynelecroy.com/products/ac032xxa-x-mercury-external-trigger-cable

Leo



OK, thanks, very useful. I went for the LeCroy Mercury T2C standard, I may well need to do power delivery protocols later, but unlikely to need the advanced option's facilities. Either of those options can be purchased separately.

The ITIC solution is reasonably priced but seems to lack an external trigger: my current use case is figuring out what is happening in an MCU based HS device when performance inexplicably drops, so I need to time correlate MCU telemetry on the scope with the bus analyser. The signal integrity looks fine, it's a firmware problem in a vendor provided USB library under load.

The Ellisys stuff seems to be priced stratospherically as soon as you want external triggers.

The Beagle options appeared about 50% more expensive than the LeCroy T2C.
 

Offline bill@geektrap.com

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Re: Scope that can decode USB
« Reply #30 on: April 01, 2019, 02:27:58 pm »
WireShark software is free and open-source and works quite well.  Just add the USB decoders.  I've used it and a LeCroy Catalyst together and have no complaints about it.
 


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